WO2015194852A1 - 다 시점 영상 부호화/복호화 방법 및 장치 - Google Patents
다 시점 영상 부호화/복호화 방법 및 장치 Download PDFInfo
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- WO2015194852A1 WO2015194852A1 PCT/KR2015/006136 KR2015006136W WO2015194852A1 WO 2015194852 A1 WO2015194852 A1 WO 2015194852A1 KR 2015006136 W KR2015006136 W KR 2015006136W WO 2015194852 A1 WO2015194852 A1 WO 2015194852A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/117—Filters, e.g. for pre-processing or post-processing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
- H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
- H04N19/139—Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
Definitions
- the present invention relates to a video encoding method and a decoding method using multi-view image prediction. Specifically, the present invention relates to a method for determining a prediction block in a multiview video encoding method and a decoding method.
- video codec for efficiently encoding or decoding high resolution or high definition video content.
- video is encoded according to a limited encoding method based on coding units having a tree structure.
- Image data in the spatial domain is transformed into coefficients in the frequency domain using frequency transformation.
- the video codec divides an image into blocks having a predetermined size for fast operation of frequency conversion, performs DCT conversion for each block, and encodes frequency coefficients in units of blocks. Compared to the image data of the spatial domain, the coefficients of the frequency domain are easily compressed.
- the image pixel value of the spatial domain is expressed as a prediction error through inter prediction or intra prediction of the video codec, when frequency conversion is performed on the prediction error, much data may be converted to zero. By substituting data repeatedly generated repeatedly with small size data, the data amount of the image can be reduced.
- a multi-view video codec encodes and decodes a base-view picture and one or more dependent-view pictures.
- the base view image and the dependent view image each include a texture picture and a depth picture corresponding to the viewpoint.
- the amount of data of the multiview image may be reduced by removing redundancy of the base view image and the dependent view image and redundancy between the texture image and the depth image.
- An inter-view video decoding method includes determining prediction values for the plurality of partitions based on.
- the determining of the reference value may include determining an average value of reference samples located at vertices of the reference block as a reference value.
- the samples of the binary map are determined to be 0 or 1, and the determining of the binary map may include determining a sample of the binary map corresponding to the reference sample, depending on whether the reference sample is greater than the reference value. It can be characterized.
- the plurality of partitions may include a first partition including a sample located at the top left of the current block and a second partition not including the sample located at the top left of the current block, and the determining of the prediction values may include: Determining a horizontal edge flag by comparing a sample located at the top left of the binary map with a sample located at the top right of the binary map; a sample located at the top left of the binary map and a sample located at the bottom left of the binary map; Determining a vertical edge flag by comparing, and determining a predicted value of the first partition and a predicted value of the second partition based on the horizontal edge flag, the vertical edge flag, and adjacent samples of the current block. It may be characterized in that it comprises a.
- the inter-view decoding method may further include determining a prediction value of the current block based on the prediction values and the offset information for the current block.
- the method may further include determining a prediction value reference block corresponding to a partition included in a current block of a texture image, and determining a partition reference block corresponding to the current block from a depth image that is different from the texture image. Determining a reference value as a reference for dividing the current block from reference samples at a predetermined position of the partition reference block; comparing the reference value with reference samples of the partition reference block to obtain a binary map of the current block; Determining a region of the partition based on the binary map, and a sample included in the region of the partition based on samples corresponding to the region of the partition among samples of the predicted value reference blocks.
- an inter-view video decoding method comprising determining prediction values for the The.
- the determining of the reference value may include determining an average value of reference samples located at vertices of the partition reference block as a reference value.
- the samples of the binary map are determined to be 0 or 1, and the determining of the binary map may include determining a sample of the binary map corresponding to the reference sample, depending on whether the reference sample is greater than the reference value. It can be characterized.
- the determining of the partition reference block may include determining the partition reference block based on a difference vector corresponding to the current block and a reference view index indicating a reference view image referenced by the current block.
- the determining of the prediction value reference block may include: a reference index indicating a motion vector corresponding to the partition and a reference image referred to by the partition or a reference vector indicating a difference vector corresponding to the partition and a reference view image referred to by the partition
- the prediction value reference block may be determined based on the viewpoint index.
- a reference value which is a reference for dividing a current block of a depth image corresponding to the texture image, is determined from reference samples at a predetermined position of a reference block of a texture image, and the reference value and the reference block are determined.
- a binary map determiner that determines a binary map of the current block by comparing reference samples of the second block, and divides the current block into a plurality of partitions based on the binary map, and adjacent samples and the binary map of the current block.
- an inter-view video decoding apparatus including a prediction value determiner that determines prediction values for the plurality of partitions based on.
- a prediction value reference block determiner determines a prediction value reference block corresponding to a partition included in a current block of a texture image, and refers to a partition corresponding to the current block from a depth image different from the texture image.
- a partition reference block determining unit which determines a block, and determines a reference value as a reference for dividing the current block from reference samples at a predetermined position of the partition reference block, and compares the reference value with reference samples of the partition reference block.
- a binary map determiner that determines a binary map of the current block, and determines an area of the partition based on the binary map and based on samples corresponding to an area of the partition among samples of the predicted value reference blocks.
- a prediction value for determining prediction values for samples included in an area of the partition There is provided an inter-view video decoding apparatus including a determiner.
- a reference value as a reference for dividing a current block of a depth image corresponding to the texture image from reference samples at a predetermined position of a reference block of a texture image, comparing the reference value with reference samples of the reference block Determining a binary map of the current block; dividing the current block into a plurality of partitions based on the binary map; and determining the plurality of partitions based on adjacent samples of the current block and the binary map.
- a prediction value reference block corresponding to a partition included in a current block of a texture image determining a partition reference block corresponding to the current block from a depth image different from the texture image; Determining a reference value that is a reference for dividing the current block from reference samples at a predetermined position; comparing the reference value with reference samples of the partition reference block to determine a binary map of the current block; Determining an area of the partition based on a map, and predicting values for samples included in an area of the partition based on samples of the prediction value reference blocks corresponding to the area of the partition.
- an inter-view video encoding method comprising determining.
- a reference value which is a reference for dividing a current block of a depth image corresponding to the texture image, is determined from reference samples at a predetermined position of a reference block of a texture image, and the reference value and the reference block are determined.
- a binary map determiner that determines a binary map of the current block by comparing reference samples of the second block, and divides the current block into a plurality of partitions based on the binary map, and adjacent samples and the binary map of the current block.
- An inter-view video encoding apparatus is provided that includes a prediction value determiner that determines prediction values for the plurality of partitions based on.
- a prediction value reference block determiner determines a prediction value reference block corresponding to a partition included in a current block of a texture image, and refers to a partition corresponding to the current block from a depth image different from the texture image.
- a partition reference block determining unit which determines a block, and determines a reference value as a reference for dividing the current block from reference samples at a predetermined position of the partition reference block, and compares the reference value with reference samples of the partition reference block.
- a binary map determiner that determines a binary map of the current block, and determines an area of the partition based on the binary map and based on samples corresponding to an area of the partition among samples of the predicted value reference blocks.
- a prediction value for determining prediction values for samples included in an area of the partition An interview video encoding apparatus including a determiner is provided.
- a computer-readable recording medium having recorded thereon a program for executing the inter-view video decoding method and encoding method.
- embodiments of a method of determining an area of a partition are provided when determining an area of a partition included in an encoding block from another reference block. It is possible to increase the multi-view video encoding and decoding speed by optimizing the computation required to determine the partition area.
- FIG. 1A is a block diagram of a video decoding apparatus, according to an embodiment.
- 1B is a flowchart of a video decoding method, according to an embodiment.
- FIG. 2A is a block diagram of a video encoding apparatus, according to an embodiment.
- 2B is a flowchart of a video encoding method, according to an embodiment.
- 3A is a block diagram of a video decoding apparatus, according to an embodiment.
- 3B is a flowchart of a video decoding method, according to an embodiment.
- FIG. 4A is a block diagram of a video encoding apparatus, according to an embodiment.
- 4B is a flowchart of a video encoding method, according to an embodiment.
- 5A is a reference block for explaining a video decoding apparatus, according to an embodiment.
- 5B illustrates a binary map for describing a video decoding apparatus, according to an embodiment.
- 5C illustrates a current block for describing a video decoding apparatus, according to an embodiment.
- FIG. 6A illustrates a current block and reference blocks referenced by the current block for explaining a video decoding apparatus, according to an embodiment.
- 6B illustrates a binary map for explaining a video decoding apparatus, according to an embodiment.
- FIG. 7 illustrates a multiview image prediction structure, according to an embodiment.
- FIG. 8A is a block diagram of a video encoding apparatus based on coding units having a tree structure, according to an embodiment.
- FIG. 8B is a block diagram of a video decoding apparatus based on coding units having a tree structure, according to an embodiment.
- FIG 9 illustrates a concept of coding units, according to an embodiment.
- 10A is a block diagram of an image encoder based on coding units, according to an embodiment.
- 10B is a block diagram of an image decoder based on coding units, according to an embodiment.
- FIG. 11 is a diagram of deeper coding units according to depths, and partitions, according to an embodiment.
- FIG. 12 illustrates a relationship between a coding unit and transformation units, according to an embodiment.
- 13 is a diagram of deeper encoding information, according to an embodiment.
- FIG. 14 is a diagram of deeper coding units according to depths, according to an exemplary embodiment.
- 15, 16, and 17 illustrate a relationship between a coding unit, a prediction unit, and a transformation unit, according to an embodiment.
- FIG. 18 illustrates a relationship between a coding unit, a prediction unit, and a transformation unit, according to encoding mode information of Table 1.
- FIG. 18 illustrates a relationship between a coding unit, a prediction unit, and a transformation unit, according to encoding mode information of Table 1.
- FIG. 19 illustrates a physical structure of a disk in which a program is stored.
- FIG. 20 shows a disc drive for recording and reading a program by using the disc.
- FIG. 21 illustrates the overall structure of a content supply system for providing a content distribution service.
- 22 and 23 illustrate an external structure and an internal structure of a mobile phone to which a video encoding method and a video decoding method are applied, according to an embodiment.
- FIG. 24 illustrates a digital broadcasting system employing a communication system, according to an embodiment.
- 25 is a diagram illustrating a network structure of a cloud computing system using a video encoding apparatus and a video decoding apparatus, according to an embodiment.
- An inter-view video decoding method includes determining prediction values for the plurality of partitions based on.
- the method may further include determining a prediction value reference block corresponding to a partition included in a current block of a texture image, and determining a partition reference block corresponding to the current block from a depth image that is different from the texture image. Determining a reference value as a reference for dividing the current block from reference samples at a predetermined position of the partition reference block; comparing the reference value with reference samples of the partition reference block to obtain a binary map of the current block; Determining a region of the partition based on the binary map, and a sample included in the region of the partition based on samples corresponding to the region of the partition among samples of the predicted value reference blocks.
- an inter-view video decoding method comprising determining prediction values for the The.
- 'image' may refer to a generic image including a still image as well as a video such as a video.
- 'picture' described in the present specification means a still image to be encoded or decoded.
- sample means data to be processed as data allocated to a sampling position of an image.
- the pixels in the spatial domain image may be samples.
- 'base-view image' means a viewpoint image that is independently encoded / decoded with respect to another viewpoint image.
- the 'dependent-view image' means a viewpoint image that is encoded / decoded depending on another viewpoint image. Therefore, the dependent view image may be encoded depending on the independent view image or another dependent view image.
- inter-view prediction and “disparity-compensated prediction (DCP)” refer to prediction methods for predicting a current view image from another view image.
- the “disparity vector” refers to a motion vector used for inter-view prediction.
- a "texture picture” or “texture map” means an image including color information of an object with respect to a current view.
- a “depth picture” or “depth map” refers to an image including information about a distance between surfaces of an object from a current viewpoint.
- a texture image and a depth image of a plurality of viewpoints are required. For example, when a 3D image is implemented based on three viewpoints, three texture images and three depth images are required. Therefore, when storing, transmitting, and reproducing a 3D image, a larger amount of data is required than a 2D image.
- the coordinate (x, y) is defined below the sample located at the upper left corner of the block. Specifically, the coordinate of the sample located at the upper left corner of the block is determined as (0,0). The x value of the coordinate increases in the right direction, and the y value of the coordinate increases in the downward direction. For example, in FIG. 5A, the coordinates of the sample 508 located at the lower right corner of the reference block 500 are (7, 7).
- FIG. 1A is a block diagram of a video decoding apparatus 100 according to an embodiment. Specifically, the block diagram of FIG. 1A shows an apparatus for performing one embodiment of intra-contour mode.
- the video decoding apparatus 100 may include a binary map determiner 110 and a prediction value determiner 120.
- the binary map determiner 110 and the predictive value determiner 120 are represented by separate components, but according to an exemplary embodiment, the binary map determiner 110 and the predictive value determiner 120 are combined to be identical. It may be implemented as a structural unit.
- the binary map determiner 110 and the predictive value determiner 120 are represented by a component unit located in one device, the binary map determiner 110 and the predictive value determiner 120 are in charge of each function.
- the devices do not necessarily need to be physically adjacent. Therefore, according to an exemplary embodiment, the binary map determiner 110 and the predictive value determiner 120 may be distributed.
- the binary map determiner 110 and the predictive value determiner 120 of FIG. 1A may be implemented by one processor according to an exemplary embodiment. In some embodiments, the present invention may also be implemented by a plurality of processors.
- the video decoding apparatus 100 may include storage (not shown) for storing data generated by the binary map determiner 110 and the predictive value determiner 120.
- the binary map determiner 110 and the predictive value determiner 120 may extract and use data stored in a storage (not shown).
- the video decoding apparatus 100 of FIG. 1A is not limited to a physical apparatus.
- some of the functions of the video decoding apparatus 100 may be implemented in software instead of hardware.
- N is an integer and may be determined to be 8, 16, 32, or 64 according to one embodiment.
- the binary map determiner 110 determines a reference value for the current block of the depth image, and determines a binary map for the current block according to the reference value.
- the binary map determiner 110 may use a texture image corresponding to the depth image.
- the texture image and the depth image at the same time point and the same picture order counter (POC) include information on the same object. Therefore, the texture image and the depth image are related to each other. Therefore, the binary map determiner 110 may use texture images of the same view and the same POC in decoding the depth image.
- the binary map determiner 110 uses a reference block of the texture image corresponding to the position of the current block of the depth image.
- the binary map determiner 110 determines a reference value from the reference samples included in the reference block. According to an exemplary embodiment, the binary map determiner 110 may determine a luma sample included in a reference block as a reference sample. According to an exemplary embodiment, the binary map determiner 110 may determine an average value of all reference samples of a reference block as a reference value. According to another exemplary embodiment, the binary map determiner 110 may determine an average value of reference samples at a predetermined position of a reference block as a reference value. As an example of the predetermined position, an average value of four reference samples positioned at a vertex of the reference block may be determined as a reference value.
- the reference sample located at (0,0), the reference sample located at (N-1,0), the reference sample located at (0, N-1), and (N-1, N-1) The average value of the reference sample located at is determined as the reference value.
- the determination methods of the reference value are only a part of various embodiments, and the reference value may be determined by another method.
- an embodiment of a method of determining a reference value will be described using the texture image of FIG. 5A.
- Reference block 500 includes a total of 8 ⁇ 8 reference samples.
- the binary map determiner 110 may determine an average value of 8x8 reference samples as a reference value. Since the calculation process of calculating the average value of the 8x8 reference samples takes a long time, the binary map determination unit 110 determines the reference samples 502 located at (0,0) and the reference samples 504 located at (7,0). ), The average value of the reference sample 506 located at (0,7) and the reference sample 508 located at (7, 7) may be determined as a reference value.
- values of the samples 508 are 64, 64, 128, and 192, respectively, 112 may be determined as a reference value.
- the binary map determiner 110 may determine the binary map of the current block by comparing the reference value and the samples of the reference block.
- the binary map includes binary samples corresponding to the samples included in the current block. Binary samples have a value of 0 or 1.
- the sample value of the binary sample is determined according to the comparison result of the reference sample and the reference value. According to an embodiment, if the reference value is larger than the sample value of the reference sample, the value of the binary sample corresponding to the reference sample may be determined as 1. On the contrary, when the reference value is smaller than the sample value of the reference sample, the value of the binary sample corresponding to the reference sample may be determined as 1.
- the method of determining the binary map is only an embodiment, and the binary map may be determined by another method. Hereinafter, an embodiment of a binary map will be described with reference to FIGS. 5A and 5B.
- FIG. 5B illustrates one embodiment of an 8x8 binary map 510.
- the binary map 510 corresponds to the reference block 500 of FIG. 5A. Therefore, the binary sample included in the binary map 510 corresponds to the reference sample of the reference block 500 according to the position. For example, the binary sample 512 located at (0,0) corresponds to the reference sample 502 located at (0,0).
- the value of the binary sample is determined by a comparison result of the reference sample and the reference value corresponding to the binary sample. For example, when the reference value is 112, if the sample value of the reference sample is less than or equal to 112, the sample value of the binary sample corresponding to the reference sample is determined to be zero. On the contrary, when the sample value of the reference sample is greater than 112, the sample value of the binary sample corresponding to the reference sample is determined to be 1.
- the prediction value determiner 120 may divide the current block into a plurality of partitions based on the binary map determined by the binary map determiner 110. According to an embodiment, the prediction value determiner 120 may determine a region of a first partition corresponding to binary samples having the same sample value as a binary sample located at (0,0) of the binary map. In addition, the prediction value determiner 120 may determine a region of the second partition corresponding to binary samples having a sample value different from the binary sample located at (0,0) of the binary map. Thus, the first partition always contains a sample located at (0,0) of the current block.
- FIG. 5C shows a current block 520 of 8x8 size divided into two partitions and reference samples 531, 532, 533, 534, 535, 536 of the current blocks 520.
- Current block 520 includes a first partition 522 and a second partition 524. Since a sample value of a binary sample located at (0,0) of the binary map 510 is 0, an area corresponding to binary samples having a sample value of 0 is determined as the first partition 522. In contrast, an area corresponding to binary samples having a sample value of 1 is determined as the second partition 524.
- the prediction value determiner 120 may determine prediction values for the plurality of partitions.
- the depth image includes information about an approximate distance between the current viewpoint and the surface of the object. Therefore, unlike the texture image, the depth image is likely to have almost the same sample value in a specific region. Therefore, for the efficiency of encoding, the prediction value determiner 120 determines all the prediction values of the samples included in the partition to be the same value. Therefore, when two partitions are determined, the samples included in the first partition have a first prediction value, and the samples included in the second partition have a second prediction value.
- the prediction value determiner 120 may determine the prediction value of the partition based on the reference samples adjacent to the current block and the binary map. According to an embodiment, the prediction value determiner 120 may compare the sample values of the binary samples included in the binary map and determine the prediction value of the partition according to the comparison result. For example, in a binary map of size NxN, a binary sample located at (0,0) is compared to a binary sample located at (N-1,0) of the binary map (hereinafter referred to as the 'horizontal comparison flag'). Can be used to determine the value. Similarly, a binary sample located at (0,0) in the binary map and a binary sample located at (0, N-1) in the binary map (hereinafter referred to as the "vertical comparison flag”) can be used to determine the predicted value of the partition. Can be.
- the horizontal comparison flag may be determined as 0 when a binary sample located at (0,0) of the binary map and a binary sample located at (N-1,0) of the binary map are the same. On the contrary, the horizontal comparison flag may be determined as 1 when the binary sample located at (0,0) of the binary map and the binary sample located at (N-1,0) of the binary map are different.
- the vertical comparison flag may be determined as 1 when a binary sample located at (0,0) of the binary map and a binary sample located at (0, N-1) of the binary map are the same. On the contrary, the vertical comparison flag may be determined as 0 when a binary sample located at (0,0) of the binary map and a binary sample located at (0, N-1) of the binary map are different.
- the binary sample 512 located at (0,0) of the binary map 510 and the binary sample 514 located at (7,0) of the binary map 510 are all zero. Therefore, the horizontal flag for the binary map 510 is determined to be zero.
- the binary sample 512 located at (0,0) of the binary map 510 has a sample value of 0, and the binary sample 516 located at (0,7) of the binary map 510 has a sample value of 1. .
- the vertical flag for binary map 510 is determined to be one.
- the prediction value determiner 120 may determine reference samples used to determine a prediction value of a partition according to a result of comparing binary samples of a specific location. For example, reference samples used to determine a prediction value of a partition may be determined according to a horizontal comparison flag and a vertical comparison flag of a binary map.
- the prediction value determiner 120 may determine a reference sample located at (-1, 0) and a reference sample located at (0, -1) when the values of the horizontal comparison flag and the vertical comparison flag are 1.
- the average value may be determined as a predicted value of the first partition.
- the prediction value determiner 120 may determine an average value of a reference sample located at (-1, N-1) and a reference sample located at (N-1, -1) of the current block as a prediction value of the second partition. have.
- the reference sample 531 located at (-1, 0) and the reference sample 532 located at (0, -1) are shown.
- An average value of may be determined as a predicted value of the first partition.
- an average value of the reference sample 533 located at (-1, 7) and the reference sample 534 located at (7, -1) of the current block may be determined as a predicted value of the second partition.
- the prediction value determiner 120 may determine the reference samples located at (-1, 0) and the reference samples located at (0, -1). The average value may be determined as a predicted value of the first partition. Also, the prediction value determiner 120 may determine a sample value of a reference sample located at (-1, 2N-1) or a reference sample located at (2N-1, -1) of the current block as a prediction value of the second partition. have.
- the reference sample 531 located at (-1, 0) and the reference sample 532 located at (0, -1) An average value of may be determined as a predicted value of the first partition.
- a sample value of the reference sample 535 located at (-1, 15) or the reference sample 536 located at (15, -1) of the current block may be determined as a predicted value of the second partition.
- the prediction value determiner 120 when the value of the horizontal comparison flag is 1 and the value of the vertical comparison flag is 0, the prediction value determiner 120 has a sample value of the reference sample located at (-1, N / 2-1). May be determined as a predicted value of the first partition. Also, the prediction value determiner 120 may determine the sample value of the reference sample located at (N-1, -1) as the prediction value of the second partition.
- the sample value of the reference sample 537 located at (-1, 3) is the prediction of the first partition. Can be determined by a value. Also, a sample value of the reference sample 534 located at (7, -1) may be determined as a predicted value of the second partition.
- the prediction value determiner 120 when the value of the horizontal comparison flag is 0 and the value of the vertical comparison flag is 1, the prediction value determiner 120 has a sample value of the reference sample located at (N / 2-1, -1). May be determined as a predicted value of the first partition. Also, the prediction value determiner 120 may determine a sample value of the reference sample located at ( ⁇ 1, N ⁇ 1) as a prediction value of the second partition.
- the sample value of the reference sample 538 located at (3, -1) is the prediction of the first partition. Can be determined by a value. Also, a sample value of the reference sample 533 positioned at (-1, 7) may be determined as a predicted value of the second partition.
- the prediction value determiner 120 references the predicted value of the first partition 522 located at (3, -1).
- the sample 538 may determine the predicted value of the second partition 524 as the sample value of the reference sample 533 located at ( ⁇ 1, 7). Accordingly, the prediction values of the samples included in the first partition 522 all have a sample value of the reference sample 538, and the prediction values of the samples included in the second partition 524 are all sample values of the reference sample 533.
- the prediction value determiner 120 may obtain offset information of the current block, and determine the prediction value of the samples included in the partition according to the offset information. For example, the prediction value determiner 120 may adjust the prediction value of the first partition by adding the first offset value to the prediction value of the first partition. Similarly, the prediction value determiner 120 may adjust the prediction value of the second partition by adding the second offset value to the prediction value of the second partition.
- the video decoding apparatus 100 may include a bitstream receiver (not shown) that receives a bitstream including encoding information.
- the encoding information includes whether the current block is predicted by the intra prediction mode,
- FIG. 1B illustrates a video decoding method 10 according to an embodiment. Specifically, the flowchart of FIG. 1B illustrates a method of performing one embodiment of an intra-contour mode.
- a reference value which is a reference for dividing the current block of the depth image corresponding to the texture image, is determined from the reference samples of the reference block included in the texture image.
- a reference value may be determined according to reference samples of a predetermined position of the reference block.
- a reference sample 502 located at (0,0) a reference sample 504 located at (N-1,0), a reference sample 506 located at (0, N-1), and (N-1,
- the average value of the reference sample 508 located at N-1) may be determined as the reference value.
- an average value of all reference samples included in the reference block may be determined as a reference value.
- step 12 the binary map of the current block is determined by comparing the reference value and the reference samples of the reference block.
- the value of the binary sample included in the binary map is determined by a comparison result of the reference sample and the reference value corresponding to the binary sample.
- step 13 the current block is divided into a plurality of partitions based on the binary map.
- the first partition is determined as an area corresponding to binary samples having the same sample value as the binary sample located at (0,0) of the binary map.
- the second partition is determined as an area corresponding to binary samples having a sample value different from the binary sample located at (0,0) of the binary map.
- step 14 prediction values for the plurality of partitions are determined based on the reference samples and the binary map of the current block.
- the vertical comparison flag and the horizontal comparison flag may be obtained by comparing adjacent samples of the current block.
- reference samples for the current block may be determined according to the vertical comparison flag and the horizontal comparison flag.
- the predicted value of the partitions is determined according to the determined reference samples.
- prediction values of partitions may be determined according to the offset information.
- FIG. 2A is a block diagram of a video encoding apparatus 200 according to an embodiment. Specifically, the block diagram of FIG. 2A shows an apparatus for performing one embodiment of an intra-contour mode.
- the video encoding apparatus 200 may include a binary map determiner 210 and a predictor value determiner 220.
- the binary map determiner 210 and the predictive value determiner 220 are represented by separate components, but according to an exemplary embodiment, the binary map determiner 210 and the predicted value determiner 220 may be combined to be identical. It may be implemented as a structural unit.
- the binary map determiner 210 and the predictive value determiner 220 are represented by a component unit located in one device, but are in charge of each function of the binary map determiner 210 and the predicted value determiner 220.
- the devices do not necessarily need to be physically adjacent. Therefore, according to an exemplary embodiment, the binary map determiner 210 and the predictive value determiner 220 may be distributed.
- the binary map determiner 210 and the predictive value determiner 220 of FIG. 2A may be implemented by one processor according to an exemplary embodiment. In some embodiments, the present invention may also be implemented by a plurality of processors.
- the video encoding apparatus 200 may include storage (not shown) for storing data generated by the binary map determiner 210 and the prediction value determiner 220.
- the binary map determiner 210 and the predictor value determiner 220 may extract and use data stored in a storage (not shown).
- the video encoding apparatus 200 of FIG. 2A is not limited to a physical apparatus.
- some of the functions of the video encoding apparatus 200 may be implemented in software instead of hardware.
- the binary map determiner 210 and the predictive value determiner 220 included in the video encoding apparatus 200 may be connected to the binary map determiner 110 and the predictive value determiner 120 included in the video decoding apparatus 100. In the same manner, the binary map may be determined, and a prediction value for the partition of the current block divided according to the binary map may be determined.
- FIG. 2B illustrates a video encoding method 20 according to an embodiment. Specifically, the flowchart of FIG. 2B illustrates a method of performing one embodiment of an intra-contour mode.
- a reference value which is a reference for dividing a current block of a depth image corresponding to the texture image, is determined from reference samples of the reference block included in the texture image.
- a reference value may be determined according to reference samples of a predetermined position of the reference block.
- step 22 the binary map of the current block is determined by comparing the reference values with the reference samples of the reference block.
- step 23 the current block is divided into a plurality of partitions based on the binary map.
- step 24 prediction values for the plurality of partitions are determined based on the reference samples and the binary map of the current block.
- the video encoding method 20 may perform the same prediction method as the video decoding method 10.
- FIG. 3A is a block diagram of a video decoding apparatus 300 according to an embodiment.
- the block diagram of FIG. 3A illustrates an apparatus for performing an embodiment of a decoding method of determining a partition included in a current block of a texture image according to a partition reference block of a depth image in an inter mode.
- the video decoding apparatus 300 may include a predictive value reference block determiner 310, a partition reference block determiner 320, a binary map determiner 330, and a predictive value determiner 340.
- the predicted value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predicted value determiner 340 are represented by separate structural units. Accordingly, the predictive value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predictive value determiner 340 may be combined to be implemented in the same component unit.
- the predicted value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predicted value determiner 340 are represented by a unit located in one device, but are predicted.
- the devices in charge of the functions of the value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predictive value determiner 340 are not necessarily physically adjacent. Therefore, according to an exemplary embodiment, the prediction value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the prediction value determiner 340 may be distributed.
- the predicted value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predicted value determiner 340 of FIG. 3A may be implemented by one processor according to an exemplary embodiment. have. In some embodiments, the present invention may also be implemented by a plurality of processors.
- the video decoding apparatus 300 may store storage for data generated by the prediction value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the prediction value determiner 340. (Not shown). Also, the predicted value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predicted value determiner 340 may extract and use stored data from storage (not shown). .
- the video decoding apparatus 300 of FIG. 3A is not limited to a physical apparatus.
- some of the functions of the video decoding apparatus 300 may be implemented in software instead of hardware.
- FIG. 6A and 6B are used to describe an embodiment of a decoding method performed by the video decoding apparatus 300 of FIG. 3A.
- FIG. 6A shows a current block 600 of 8x8 size and reference blocks 610, 620, 630 referenced by the current block 600.
- the reference blocks of FIG. 6A include a first prediction value reference block 610, a second prediction value reference block 620, and a partition reference block 630.
- 6B includes a binary map 650 of 8x8 size determined based on the partition reference block 630.
- the current block 600, the reference blocks 610, 620, 630 and the binary map 650 have a block shape of size N ⁇ N.
- the current block 600, the reference blocks 610, 620, 630 and the binary map 650 are described together with each component of the video decoding apparatus 300 of FIG. 3A.
- the prediction value reference block determiner 310 determines a prediction value reference block corresponding to a partition included in the current block of the texture image.
- the predictive value reference block is a reference block used to determine the predictive value of a sample included in the partition. Therefore, the predicted value reference block is included in the texture image that does not include the current block.
- the prediction value reference block determiner 310 may determine the prediction block according to a motion vector corresponding to the partition and a reference index indicating a reference image referenced by the partition.
- the reference index indicates a reference picture of another POC at the same time.
- the motion vector represents the displacement between the coordinates of the current block and the coordinates of the prediction value reference block.
- the prediction value reference block determiner 310 may determine the prediction block based on a difference vector corresponding to the partition and a reference view index indicating a reference view image referenced by the partition.
- the reference view index indicates a reference picture of another view in the same POC.
- the difference vector represents a viewpoint difference between the coordinates of the current block and the coordinates of the prediction value reference block.
- the prediction value reference block determiner 310 selects the first prediction value reference block corresponding to the first partition included in the current block and the second prediction value reference block corresponding to the second partition. You can decide.
- the first prediction value reference block may be used to determine the prediction value of the samples included in the first partition.
- the second prediction value reference block can be used to determine the prediction values of the samples included in the second partition.
- the first prediction value reference block 610 of FIG. 6A corresponds to the first partition 602 of the current block 600.
- the second prediction value reference block 620 also corresponds to the second partition 604 of the current block 600.
- the first prediction value reference block 610 is determined according to a first motion vector corresponding to the first partition and a first reference index indicating a reference image to which the first partition refers, or a first difference vector corresponding to the first partition. And a first reference view index indicating a reference view image referenced by the first partition.
- the second prediction value reference block 620 is determined according to a second motion vector corresponding to the second partition and a second reference index indicating a reference image referenced by the second partition, or a second difference vector corresponding to the second partition. And a second reference view index indicating a reference view image referenced by the second partition.
- the partition reference block determiner 320 determines a reference block corresponding to the current block from a depth image different from the texture image.
- the partition reference block is a reference block used to determine a partition of the current block.
- the partition reference block is included in the depth image of the view reconstructed before the current view.
- the partition reference block determiner 320 may determine a partition reference block based on a difference vector corresponding to the current block and a reference view index indicating a reference view image referenced by the current block.
- the reference view index indicates a reference picture of another view in the same POC.
- the difference vector represents a viewpoint difference between the coordinates of the current block and the coordinates of the partition reference block.
- the reference view index used in the partition reference block determiner 320 may not be the same as the reference view index used in the predicted value reference block determiner 310.
- the difference vector used in the partition reference block determiner 320 may not be the same as the difference vector used in the predicted value reference block determiner 310.
- the partition reference block 630 of FIG. 6A is used to determine the regions of the first partition 602 and the second partition 604 of the current block 600.
- the partition reference block 630 may be determined according to a third difference vector corresponding to the current block and a third reference view index indicating a reference view image that the current block refers to for partition determination.
- the binary map determiner 330 determines a reference value as a reference for dividing the current block from partition reference samples at a predetermined position of the partition reference block, compares the reference value with partition reference samples of the partition reference block, Determine the binary map.
- the binary map determiner 330 determines a reference value from partition reference samples included in the partition reference block. According to an embodiment, the binary map determiner 330 may determine the depth sample included in the partition reference block as the partition reference sample. According to an embodiment, the binary map determiner 330 may determine an average value of all depth samples of the partition reference block as a reference value. According to another exemplary embodiment, the binary map determiner 330 may determine an average value of partition reference samples at a predetermined position of the partition reference block as a reference value. As an example of a predetermined position, an average value of four partition reference samples located at vertices of the partition reference block may be determined as a reference value.
- the average value of the partition reference sample located at N-1) is determined as the reference value.
- the determination methods of the reference value are only a part of various embodiments, and the reference value may be determined by another method.
- an embodiment of a method of determining a reference value is described using the partition reference block 630 of FIG. 6A.
- the binary map determiner 330 may partition partition samples 642 and partition reference samples 644 and 0, 7 located at (0,0) of the partition reference block 630.
- the average value of the partition reference samples 646 located at ⁇ and the partition reference samples 648 located at (7, 7) may be determined as reference values.
- the values of the located partition reference sample 648 are 64, 64, 128, and 192, 112 may be determined as a reference value.
- the binary map determiner 330 may determine the binary map of the current block by comparing the reference value with the samples of the reference block.
- the binary map contains binary samples.
- the sample value of the binary sample is determined according to the comparison result of the partition reference sample and the reference value. According to an embodiment, if the reference value is larger than the sample value of the partition reference sample, the value of the binary sample corresponding to the partition reference sample may be determined as 1. On the contrary, when the reference value is smaller than the sample value of the partition reference sample, the value of the binary sample corresponding to the partition reference sample may be determined to be zero.
- the method of determining the binary map is only an embodiment, and the binary map may be determined by another method. One embodiment of a binary map is shown according to FIG. 6B.
- Binary samples of the binary map 650 of FIG. 6B have a value of zero or one.
- Binary samples 652 with a value of 1 are located at the top left of the binary map 650, and binary samples 654 with a value of 0 are located at the bottom right of the binary map 650.
- the partition of the current block is determined according to the distribution of the binary samples.
- the prediction value determiner 340 determines the region of the partition based on the binary map, and based on the samples corresponding to the region of the partition among the samples of the prediction blocks, the prediction value determiner 340 obtains prediction values for the samples included in the region of the partition.
- the prediction value determiner 340 may divide the current block into a plurality of partitions based on the binary map determined by the binary map determiner 330. According to an embodiment, the prediction value determiner 340 may determine a region of a first partition corresponding to binary samples having the same sample value as a binary sample located at (0,0) of the binary map. Also, the prediction value determiner 340 may determine an area of the second partition corresponding to binary samples having a sample value different from the binary sample located at (0,0) of the binary map. Thus, the first partition always contains a sample located at (0,0) of the current block.
- regions of the first partition 602 and the second partition 604 of the current block 600 of FIG. 6A are determined according to the binary map 650 of FIG. 6B. Since the value of the binary sample located at (0,0) of the binary map is 1, the area of the first partition 602 is determined based on the area where the binary samples having the sample value of 1 are located. In contrast, the region of the second partition 604 is determined based on the region where the binary samples with a sample value of zero are located.
- the prediction value determiner 340 may determine prediction values for samples included in the partition. According to an embodiment, the prediction value determiner 340 may determine sample values of samples included in the region of the first partition from the first prediction value reference block. The prediction value determiner 340 may determine the sample values of the samples included in the region of the second partition from the second prediction value reference block.
- sample values of the first partition 602 of the current block 600 of FIG. 6A are determined based on samples included in the first partition correspondence region 612 of the first prediction value block 610.
- the predicted value of the sample located at (x, y) of the first partition 602 may be determined as the sample value of the sample located at (x, y) of the first partition correspondence region 612. Therefore, when the sample value of the sample located at (0,0) of the first partition correspondence region 612 is 128, the predicted value of the sample located at (0,0) of the first partition 602 is determined to be 128.
- sample values of the second partition 604 of the current block 600 of FIG. 6A are determined based on samples included in the second partition correspondence region 624 of the second prediction value block 620.
- the predicted value of the sample located at (x, y) of the second partition 604 may be determined as the sample value of the sample located at (x, y) of the second partition correspondence region 624. Therefore, when the sample value of the sample located at (7, 7) of the second partition correspondence region 624 is 64, the predicted value of the sample located at (7, 7) of the first partition 602 is determined as 64.
- the first partition non-corresponding area 614 of the first prediction value block 610 and the second partition non-corresponding area 622 of the second prediction value block 620 are not used for the prediction of the current block 600. Do not.
- FIG. 3B is a flowchart of a video decoding method 300, according to an embodiment.
- the flowchart of FIG. 3B illustrates an embodiment of a decoding method of determining a partition included in a current block of a texture image according to a partition reference block of a depth image in an inter mode.
- the prediction value reference block corresponding to the partition included in the current block of the texture image is determined.
- a prediction value reference block may be determined based on a motion vector corresponding to a partition and a reference index indicating a reference picture referenced by the partition or a difference vector corresponding to a partition and a reference view index indicating a reference view image referenced by the partition.
- a partition reference block corresponding to the current block is determined from a depth image different from the texture image.
- a partition reference block may be determined based on a difference vector corresponding to the current block and a reference view index indicating a reference view image referenced by the current block.
- a reference value as a reference for dividing the current block is determined from partition reference samples at predetermined positions of the partition reference block.
- an average value of partition reference samples located at vertices of the partition reference block may be determined as a reference value.
- step 34 the binary map of the current block is determined by comparing the reference value and the partition reference samples of the partition reference block. Depending on whether the partition reference sample is larger than the reference value, a sample of the binary map corresponding to the partition reference sample is determined.
- step 35 an area of a partition is determined based on the binary map.
- prediction values for the samples included in the region of the partition are determined based on samples corresponding to the region of the partition among the samples of the prediction value reference blocks.
- FIG. 4A is a block diagram of a video encoding apparatus 400 according to an embodiment.
- the block diagram of FIG. 4A illustrates an apparatus for performing an encoding method of determining a partition included in a current block of a texture image according to a partition reference block of a depth image in an inter mode.
- the video encoding apparatus 400 may include a predictive value reference block determiner 410, a partition reference block determiner 420, a binary map determiner 430, and a predictive value determiner 440.
- the predicted value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predicted value determiner 440 are represented by separate structural units. Accordingly, the predictive value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predictive value determiner 440 may be combined and implemented in the same component unit.
- the predicted value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predicted value determiner 440 are expressed in units of one device, but are predicted.
- the apparatuses in charge of the functions of the value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predictive value determiner 440 are not necessarily physically adjacent. Therefore, in some embodiments, the prediction value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predictive value determiner 440 may be distributed.
- the prediction value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predictive value determiner 440 of FIG. 4A may be implemented by one processor according to an exemplary embodiment. have. In some embodiments, the present invention may also be implemented by a plurality of processors.
- the video encoding apparatus 400 is configured to store data generated by the predicted value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predicted value determiner 440. (Not shown).
- the predicted value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predicted value determiner 440 may extract and use stored data from storage (not shown). .
- the video encoding apparatus 400 of FIG. 4A is not limited to a physical apparatus.
- some of the functions of the video encoding apparatus 400 may be implemented in software instead of hardware.
- the predictive value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the predictive value determiner 440 included in the video encoding apparatus 400 are the video decoding apparatus 300.
- the prediction value reference block and the partition reference block are included in the same manner as the prediction value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the prediction value determiner 340 included in the. Determine, determine the binary map according to the partition reference block, and determine the prediction value for the partition of the current block divided according to the binary map.
- FIG. 4B illustrates a video encoding method 40 according to an embodiment.
- the flowchart of FIG. 4B illustrates an apparatus for performing an embodiment of an encoding method of determining a partition included in a current block of a texture image according to a partition reference block of a depth image in an inter mode.
- the predicted value reference block corresponding to the partition included in the current block of the texture image is determined.
- a partition reference block corresponding to the current block is determined from the depth image of the viewpoint different from the texture image.
- a reference value as a reference for dividing the current block is determined from partition reference samples at predetermined positions of the partition reference block.
- step 44 the binary map of the current block is determined by comparing the reference value and the partition reference samples of the partition reference block.
- step 45 an area of the partition is determined based on the binary map.
- prediction values for samples included in the region of the partition are determined based on samples corresponding to the region of the partition among the samples of the prediction value reference blocks.
- the video encoding method 40 may perform the same prediction method as the video decoding method 30.
- FIG. 7 illustrates a multiview image prediction structure, according to an embodiment.
- the video encoding apparatus 100 may predict the base view image and the dependent view images according to the reproduction order 700 of the multi-view video prediction structure shown in FIG. 7.
- a base view image and two dependent view images are encoded, but three or more dependent view images may be encoded according to an embodiment.
- images of the same view are arranged in the horizontal direction. Therefore, left view images labeled 'Left' are arranged in a row in the horizontal direction, center view images labeled 'Center' are arranged in a row in the horizontal direction, and right view images labeled 'Right' are arranged in a row in the horizontal direction.
- the center view image may be a base view image
- the left view image and the right view image may be dependent view images.
- the left view image or the right view image may be a basic view image.
- images having the same POC are arranged in the vertical direction.
- the POC indicates the playback order of the images constituting the video.
- 'POC X' displayed in the multi-view video prediction structure 700 indicates a relative reproduction order of images located in a corresponding column. The smaller the number of X is, the higher the reproduction order is, and the larger the reproduction order is, the lower the reproduction order is.
- left view images denoted as 'Left' are arranged in the horizontal direction according to the POC
- base view images denoted as 'Center' are arranged in the horizontal direction according to the POC.
- right-view images marked 'Right' are arranged in the horizontal direction according to the POC.
- both the left view image and the right view image located in the same column as the base view image are images having different viewpoints but having the same POC (playing order).
- each GOP includes images between successive anchor pictures and one anchor picture. According to an embodiment, more than four images may be included in the GOP. Also, according to an embodiment, the number of images included in each GOP may be different. The number of images included in the GOP may be determined according to the encoding / decoding efficiency.
- An anchor picture is a random access point.
- Base view images include base view anchor pictures 711, 712, 713, 714, 715
- left view images include left view anchor pictures 721, 722, 723, 724, 725
- right view point The images include right-view anchor pictures 731, 732, 733, 734, and 735.
- the anchor picture shown in FIG. 7 is merely an example, and the anchor picture may be located in another POC according to encoding / decoding efficiency.
- Multi-view images may be played back in GOP order and predicted (restored).
- images included in GOP 0 may be reproduced, and then images included in GOP 1 may be reproduced. That is, images included in each GOP may be reproduced in the order of GOP 0, GOP 1, GOP 2, and GOP 3.
- the images included in GOP 1 may be predicted (restored). That is, images included in each GOP may be predicted (restored) in the order of GOP 0, GOP 1, GOP 2, and GOP 3.
- Inter prediction by the multi-view video prediction structure 700 includes motion-compaensated prediction (MCP) and disparity-compensated prediction (DCP).
- the motion compensation prediction is an inter prediction using an image located before and after the current image in time at the same time point as a reference image.
- the prediction unit of the current image is determined according to a motion vector and a reference image index of the prediction unit of the current image.
- Difference Compensation Prediction Inter prediction using an image of a different view as a reference image within the same POC.
- the prediction unit of the current image is determined according to a difference vector and a reference view index of the prediction unit of the current image.
- an image at which an arrow starts is a reference image
- an image at which an arrow ends is an image predicted using the reference image.
- the prediction result of the base view images may be encoded and output in the form of the base view bitstream
- the prediction result of the dependent view images may be encoded and output in the form of the dependent view bitstream.
- the prediction encoding result of the center view images is in the form of a base view bitstream
- the prediction encoding result of the left view images is a first dependency view bitstream
- the prediction encoding result of the right view images is a second dependency. It may be output as a view bitstream.
- the anchor pictures 711, 712, 713, 714, and 715 that are the I-picture type do not refer to other pictures, but the remaining pictures that are the B-picture type and the b-picture type are predicted with reference to other base view images. do.
- the B-picture type pictures are predicted with reference to the I-picture type anchor picture followed by the POC and the I-picture type anchor picture that follows.
- the b-picture type pictures are predicted by referring to an I-picture type anchor picture followed by a POC and a B-picture type picture following a POC or to an I-picture type anchor picture following a POC.
- the left view image may refer to the center view image or the right view image of the same POC.
- the right view image may refer to the center view image or the left view image of the same POC.
- the inter-view prediction is performed by referring to the base view anchor pictures 711, 712, 713, 714, 715 having the same POC, respectively. Can be performed.
- the base view images 711, 712, 713, 714, and 715 or the left view anchor pictures 721, 722, 723, and 724, respectively, having the same POC. 725 may be performed with reference to 725.
- the remaining images other than the anchor pictures 711, 712, 713, 714, 715, 721, 722, 723, 724, and 725 of the left view images and the right view images may be predicted with reference to the same view images. Accordingly, the remaining images other than the anchor pictures 711, 712, 713, 714, 715, 721, 722, 723, 724, and 725 of the left view images and the right view images are predicted by motion compensation prediction or difference compensation prediction. do.
- the video decoding apparatuses 200 and 400 may reconstruct center view images, left view images, and right view images according to the multiview video prediction structure 700 illustrated in FIG. 7.
- the prediction order of the image disclosed in FIG. 7 is only an example, and may be predicted according to another prediction order for encoding / decoding efficiency.
- FIG. 8A is a block diagram of a video encoding apparatus 800 based on coding units having a tree structure, according to various embodiments.
- the video encoding apparatus 800 including video prediction based on coding units having a tree structure includes an encoder 810 and an output unit 820.
- the video encoding apparatus 800 that carries video prediction based on coding units having a tree structure according to an embodiment is referred to as a short term 'video encoding apparatus 800'.
- the encoder 810 may partition the current picture based on a maximum coding unit that is a maximum coding unit for the current picture of the image. If the current picture is larger than the maximum coding unit, image data of the current picture may be split into at least one maximum coding unit.
- the maximum coding unit may be a data unit having a size of 32x32, 64x64, 128x128, 256x256, or the like, and may be a square data unit having a square of two horizontal and vertical sizes.
- the coding unit according to an embodiment may be characterized by a maximum size and depth.
- the depth indicates the number of times the coding unit is spatially divided from the maximum coding unit, and as the depth increases, the coding unit for each depth may be split from the maximum coding unit to the minimum coding unit.
- the depth of the largest coding unit is the highest depth and the minimum coding unit may be defined as the lowest coding unit.
- the maximum coding unit decreases as the depth increases, the size of the coding unit for each depth decreases, and thus, the coding unit of the higher depth may include coding units of a plurality of lower depths.
- the image data of the current picture may be divided into maximum coding units according to the maximum size of the coding unit, and each maximum coding unit may include coding units divided by depths. Since the maximum coding unit is divided according to depths, image data of a spatial domain included in the maximum coding unit may be hierarchically classified according to depths.
- the maximum depth and the maximum size of the coding unit that limit the total number of times of hierarchically dividing the height and the width of the maximum coding unit may be preset.
- the encoder 810 encodes at least one divided region obtained by dividing the region of the largest coding unit for each depth, and determines a depth at which the final encoding result is output for each of the at least one divided region. That is, the encoder 810 encodes the image data in coding units according to depths for each maximum coding unit of the current picture, and selects a depth at which the smallest coding error occurs to determine the coding depth. The determined coded depth and the image data for each maximum coding unit are output to the output unit 820.
- Image data in the largest coding unit is encoded based on coding units according to depths according to at least one depth less than or equal to the maximum depth, and encoding results based on the coding units for each depth are compared. As a result of comparing the encoding error of the coding units according to depths, a depth having the smallest encoding error may be selected. At least one coding depth may be determined for each maximum coding unit.
- the coding unit is divided into hierarchically and the number of coding units increases.
- a coding error of each data is measured and it is determined whether to divide into lower depths. Therefore, even in the data included in one largest coding unit, since the encoding error for each depth is different according to the position, the coding depth may be differently determined according to the position. Accordingly, one or more coding depths may be set for one maximum coding unit, and data of the maximum coding unit may be partitioned according to coding units of one or more coding depths.
- the encoder 810 may determine coding units having a tree structure included in the current maximum coding unit.
- the coding units having a tree structure according to an embodiment include coding units having a depth determined as a coding depth among all deeper coding units included in the maximum coding unit.
- the coding unit of the coding depth may be hierarchically determined according to the depth in the same region within the maximum coding unit, and may be independently determined for the other regions.
- the coded depth for the current region may be determined independently of the coded depth for the other region.
- the maximum depth according to an embodiment is an index related to the number of divisions from the maximum coding unit to the minimum coding unit.
- the maximum depth according to an embodiment may represent the total number of splits from the maximum coding unit to the minimum coding unit. For example, when the depth of the largest coding unit is 0, the depth of the coding unit obtained by dividing the largest coding unit once may be set to 1, and the depth of the coding unit divided twice may be set to 2. In this case, if the coding unit divided four times from the maximum coding unit is the minimum coding unit, since depth levels of depths 0, 1, 2, 3, and 4 exist, the maximum depth may be set to 4.
- Predictive encoding and transformation of the largest coding unit may be performed. Similarly, prediction encoding and transformation are performed based on depth-wise coding units for each maximum coding unit and for each depth less than or equal to the maximum depth.
- encoding including prediction encoding and transformation should be performed on all the coding units for each depth generated as the depth deepens.
- the prediction encoding and the transformation will be described based on the coding unit of the current depth among at least one maximum coding unit.
- the video encoding apparatus 800 may variously select a size or shape of a data unit for encoding image data.
- the encoding of the image data is performed through prediction encoding, transforming, entropy encoding, and the like.
- the same data unit may be used in every step, or the data unit may be changed in steps.
- the video encoding apparatus 800 may select not only a coding unit for encoding the image data but also a data unit different from the coding unit in order to perform predictive encoding of the image data in the coding unit.
- prediction encoding may be performed based on a coding unit of a coding depth, that is, a more strange undivided coding unit, according to an embodiment.
- a more strange undivided coding unit that is the basis of prediction coding is referred to as a 'prediction unit'.
- the partition in which the prediction unit is divided may include a data unit in which at least one of the prediction unit and the height and the width of the prediction unit are divided.
- the partition may be a data unit in which the prediction unit of the coding unit is split, and the prediction unit may be a partition having the same size as the coding unit.
- the partition type includes not only symmetric partitions in which the height or width of the prediction unit is divided by a symmetrical ratio, but also partitions divided in an asymmetrical ratio, such as 1: n or n: 1, by a geometric form. It may optionally include partitioned partitions, arbitrary types of partitions, and the like.
- the prediction mode of the prediction unit may be at least one of an intra mode, an inter mode, and a skip mode.
- the intra mode and the inter mode may be performed on partitions having sizes of 2N ⁇ 2N, 2N ⁇ N, N ⁇ 2N, and N ⁇ N.
- the skip mode may be performed only for partitions having a size of 2N ⁇ 2N.
- the encoding may be performed independently for each prediction unit within the coding unit to select a prediction mode having the smallest encoding error.
- the video encoding apparatus 800 may perform the transformation of the image data of the coding unit based on not only a coding unit for encoding the image data but also a data unit different from the coding unit.
- the transformation may be performed based on a transformation unit having a size smaller than or equal to the coding unit.
- the transformation unit may include a data unit for intra mode and a transformation unit for inter mode.
- the transformation unit in the coding unit is also recursively divided into smaller transformation units, so that the residual data of the coding unit is determined according to the tree structure according to the transformation depth. Can be partitioned according to the conversion unit.
- a transform depth indicating a number of divisions between the height and the width of the coding unit divided to the transform unit may be set. For example, if the size of the transform unit of the current coding unit of size 2Nx2N is 2Nx2N, the transform depth is 0, the transform depth 1 if the size of the transform unit is NxN, and the transform depth 2 if the size of the transform unit is N / 2xN / 2. Can be. That is, the transformation unit having a tree structure may also be set for the transformation unit according to the transformation depth.
- the encoded information for each coded depth requires not only the coded depth but also prediction related information and transformation related information. Accordingly, the encoder 810 may determine not only the coded depth that generated the minimum encoding error, but also a partition type obtained by dividing a prediction unit into partitions, a prediction mode for each prediction unit, and a size of a transformation unit for transformation.
- a method of determining a coding unit, a prediction unit / partition, and a transformation unit according to a tree structure of a maximum coding unit according to an embodiment will be described later in detail with reference to FIGS. 15 to 24.
- the encoder 810 may measure a coding error of coding units according to depths using a Lagrangian Multiplier-based rate-distortion optimization technique.
- the output unit 820 outputs the image data of the maximum coding unit encoded and the information about the encoding modes according to depths in the form of a bit stream based on the at least one coded depth determined by the encoder 810.
- the encoded image data may be a result of encoding residual data of the image.
- the information about the encoding modes according to depths may include encoding depth information, partition type information of a prediction unit, prediction mode information, size information of a transformation unit, and the like.
- the coded depth information may be defined using depth-specific segmentation information indicating whether to encode to a coding unit of a lower depth without encoding to the current depth. If the current depth of the current coding unit is a coding depth, since the current coding unit is encoded in a coding unit of the current depth, split information of the current depth may be defined so that it is no longer divided into lower depths. On the contrary, if the current depth of the current coding unit is not the coding depth, encoding should be attempted using the coding unit of the lower depth, and thus split information of the current depth may be defined to be divided into coding units of the lower depth.
- encoding is performed on the coding unit divided into the coding units of the lower depth. Since at least one coding unit of a lower depth exists in the coding unit of the current depth, encoding may be repeatedly performed for each coding unit of each lower depth, and recursive coding may be performed for each coding unit of the same depth.
- coding units having a tree structure are determined in one largest coding unit and information about at least one coding mode should be determined for each coding unit of a coding depth, information about at least one coding mode may be determined for one maximum coding unit. Can be.
- the coding depth may be different for each location, and thus information about the coded depth and the coding mode may be set for the data.
- the output unit 820 may allocate encoding information about a corresponding coding depth and an encoding mode to at least one of a coding unit, a prediction unit, and a minimum unit included in the maximum coding unit. .
- the minimum unit according to an embodiment is a square data unit having a size obtained by dividing the minimum coding unit, which is the lowest coding depth, into four divisions.
- the minimum unit according to an embodiment may be a square data unit having a maximum size that may be included in all coding units, prediction units, partition units, and transformation units included in the maximum coding unit.
- the encoding information output through the output unit 820 may be classified into encoding information according to depth coding units and encoding information according to prediction units.
- the encoding information for each coding unit according to depth may include prediction mode information and partition size information.
- the encoding information transmitted for each prediction unit includes information about an estimation direction of the inter mode, information about a reference image index of the inter mode, information about a motion vector, information about a chroma component of an intra mode, and information about an inter mode of an intra mode. And the like.
- Information about the maximum size and information about the maximum depth of a coding unit defined for each picture, slice segment, or GOP may be inserted into a header, a sequence parameter set, or a picture parameter set of a bitstream.
- the information on the maximum size of the transform unit and the minimum size of the transform unit allowed for the current video may also be output through a header, a sequence parameter set, a picture parameter set, or the like of the bitstream.
- the output unit 820 may encode and output reference information, prediction information, and slice segment type information related to prediction.
- the coding units according to depths are coding units having a size in which the height and width of coding units of one layer higher depth are divided by half. That is, if the size of the coding unit of the current depth is 2Nx2N, the size of the coding unit of the lower depth is NxN.
- the current coding unit having a size of 2N ⁇ 2N may include up to four lower depth coding units having a size of N ⁇ N.
- the video encoding apparatus 800 determines a coding unit having an optimal shape and size for each maximum coding unit based on the size and the maximum depth of the maximum coding unit determined in consideration of the characteristics of the current picture. Coding units may be configured. In addition, since each of the maximum coding units may be encoded in various prediction modes and transformation methods, an optimal coding mode may be determined in consideration of image characteristics of coding units having various image sizes.
- the video encoding apparatus may adjust the coding unit in consideration of the image characteristics while increasing the maximum size of the coding unit in consideration of the size of the image, thereby increasing image compression efficiency.
- the video encoding apparatus described above with reference to FIGS. 2A and 4A may include as many video encoding apparatuses 800 as the number of viewpoints for encoding texture images and depth images included in the plurality of viewpoints. For example, since three viewpoints are used in FIG. 7, three video encoding apparatuses 800 may be used to encode the multi-view image of FIG. 7.
- the encoder 810 determines a prediction unit for inter-image prediction for each coding unit having a tree structure for each largest coding unit, and predicts the inter-image for each prediction unit. Can be performed.
- the encoder 810 determines a coding unit and a prediction unit having a tree structure for each maximum coding unit, and performs inter-image prediction or inter-view prediction for each prediction unit. Can be done.
- the video encoding apparatus 800 may encode an interlayer prediction error for predicting a current layer image using SAO. Accordingly, the prediction error of the current layer image may be encoded using only information on the SAO type and the offset, based on the sample value distribution of the prediction error, without having to encode the prediction error for each sample position.
- the encoder 810 may perform the functions of the binary map determiner 210 and the predictive value determiner 220 of FIG. 2A. According to an embodiment, the encoder 810 may perform functions of the prediction value reference block determiner 410, the partition reference block determiner 420, the binary map determiner 430, and the prediction value determiner 440 of FIG. 4A. Can be done.
- FIG. 8B is a block diagram of a video decoding apparatus 850 based on coding units having a tree structure, according to various embodiments.
- a video decoding apparatus 850 including video prediction based on coding units having a tree structure includes image data and encoding information reception extractor 860 and a decoder 870.
- the video decoding apparatus 850 including video prediction based on coding units having a tree structure according to an embodiment is referred to as a short term 'video decoding apparatus 850'.
- Definitions of various terms such as a coding unit, a depth, a prediction unit, a transformation unit, and information about various encoding modes for a decoding operation of the video decoding apparatus 850 according to an embodiment may be described with reference to FIG. 8 and the video encoding apparatus 800. Same as described above with reference.
- the reception extractor 860 receives and parses a bitstream of an encoded video.
- the image data and encoding information reception extractor 860 extracts image data encoded for each coding unit according to the coding units having a tree structure from the parsed bitstream, and outputs the encoded image data to the decoder 870.
- the image data and encoding information reception extractor 860 may extract information about a maximum size of a coding unit of the current picture from a header, a sequence parameter set, or a picture parameter set for the current picture.
- the image data and encoding information reception extractor 860 extracts information about a coded depth and an encoding mode of coding units having a tree structure for each maximum coding unit, from the parsed bitstream.
- the extracted information about the coded depth and the coding mode is output to the decoder 870. That is, the image data of the bit string may be divided into maximum coding units so that the decoder 870 may decode the image data for each maximum coding unit.
- the information about the coded depth and the encoding mode for each largest coding unit may be set with respect to one or more coded depth information, and the information about the coding mode according to the coded depths may include partition type information, prediction mode information, and transformation unit of the corresponding coding unit. May include size information and the like.
- split information for each depth may be extracted as the coded depth information.
- the information about the coded depth and the encoding mode for each maximum coding unit extracted by the image data and the encoding information reception extractor 860 may be different according to the depths for each of the maximum coding units, as in the video encoding apparatus 800 according to an exemplary embodiment.
- the image data and encoding information reception extractor 860 may be predetermined. Information about a coded depth and an encoding mode may be extracted for each data unit. If the information about the coded depth and the coding mode of the maximum coding unit is recorded for each of the predetermined data units, the predetermined data units having the information about the same coded depth and the coding mode are inferred as data units included in the same maximum coding unit. Can be.
- the decoder 870 reconstructs the current picture by decoding image data of each maximum coding unit based on the information about the coded depth and the encoding mode for each maximum coding unit. That is, the decoder 870 may decode encoded image data based on the read partition type, prediction mode, and transformation unit for each coding unit among coding units having a tree structure included in the maximum coding unit. .
- the decoding process may include a prediction process including intra prediction and motion compensation, and an inverse transform process.
- the decoder 870 may perform intra prediction or motion compensation according to each partition and prediction mode for each coding unit, based on partition type information and prediction mode information of the prediction unit of the coding unit for each coding depth.
- the decoder 870 may read transform unit information according to a tree structure for each coding unit and perform inverse transform based on the transformation unit for each coding unit for inverse transformation for each coding unit. Through inverse transformation, the pixel value of the spatial region of the coding unit may be restored.
- the decoder 870 may determine the coded depth of the current maximum coding unit by using the split information for each depth. If the split information indicates that the split information is no longer split at the current depth, the current depth is the coded depth. Therefore, the decoder 870 may decode the coding unit of the current depth with respect to the image data of the current maximum coding unit by using the partition type, the prediction mode, and the transformation unit size information of the prediction unit.
- the decoding unit 870 encodes the same data. It can be regarded as one data unit to be decoded in the mode.
- the decoding of the current coding unit may be performed by obtaining information about an encoding mode for each coding unit determined in this way.
- the video decoding apparatus described above with reference to FIGS. 1A and 3A may include as many video decoding apparatuses 850 as the number of viewpoints for decoding the texture image and the depth image included in the plurality of viewpoints. For example, since three viewpoints are used in FIG. 7, three video decoding apparatuses 850 may be used to decode the multi-view image of FIG. 7.
- the decoder 870 of the video decoding apparatus 850 may extract samples of the independent view images extracted from the independent view image stream by the reception extractor 860. It may be divided into coding units according to a tree structure of the largest coding unit. The decoder 870 may reconstruct independent view images by performing inter-picture prediction for each coding unit according to a tree structure of samples of reference layer pictures.
- the decoder 870 of the video decoding apparatus 850 may extract the samples of the subordinate view images extracted from the subordinate view image stream by the reception extractor 860 in the maximum coding unit. It may be divided into coding units according to a structure. The decoder 870 may reconstruct the dependent view images by performing inter-image prediction or inter-view prediction for each coding unit of samples of the dependent view images.
- the reception extractor 860 may acquire the SAO type and the offset from the received current layer bitstream and determine the SAO category according to the distribution of sample values for each sample of the current layer prediction image.
- the offset for each SAO category can be obtained. Therefore, even if the prediction error is not received for each sample, the decoder 870 compensates the offset for each category of each sample of the current hierarchical prediction image, and determines the current hierarchical reconstruction image by referring to the compensated current hierarchical prediction image. have.
- the video decoding apparatus 850 may obtain information about a coding unit that generates a minimum coding error by recursively encoding the maximum coding units in the encoding process, and use the same to decode the current picture. That is, decoding of encoded image data of coding units having a tree structure determined as an optimal coding unit for each maximum coding unit can be performed.
- the image data can be efficiently used according to the coding unit size and the encoding mode that are adaptively determined according to the characteristics of the image by using the information about the optimum encoding mode transmitted from the encoding end. Can be decoded and restored.
- the decoder 870 may perform the functions of the binary map determiner 110 and the predictive value determiner 120 of FIG. 1A. According to an embodiment, the decoder 870 performs the functions of the predicted value reference block determiner 310, the partition reference block determiner 320, the binary map determiner 330, and the predicted value determiner 340 of FIG. 3A. Can be done.
- FIG 9 illustrates a concept of coding units, according to various embodiments.
- a size of a coding unit may be expressed by a width x height, and may include 32x32, 16x16, and 8x8 from a coding unit having a size of 64x64.
- Coding units of size 64x64 may be partitioned into partitions of size 64x64, 64x32, 32x64, and 32x32, coding units of size 32x32 are partitions of size 32x32, 32x16, 16x32, and 16x16, and coding units of size 16x16 are 16x16.
- Coding units of size 8x8 may be divided into partitions of size 8x8, 8x4, 4x8, and 4x4, into partitions of 16x8, 8x16, and 8x8.
- the resolution is set to 1920x1080, the maximum size of the coding unit is 64, and the maximum depth is 2.
- the resolution is set to 1920x1080, the maximum size of the coding unit is 64, and the maximum depth is set to 3.
- the resolution is set to 352x288, the maximum size of the coding unit is 16, and the maximum depth is 1.
- the maximum depth illustrated in FIG. 15 represents the total number of divisions from the maximum coding unit to the minimum coding unit.
- the maximum size of the coding size is relatively large not only to improve the coding efficiency but also to accurately shape the image characteristics. Accordingly, the video data 910 and 920 having higher resolution than the video data 930 may be selected to have a maximum size of 64.
- the coding unit 915 of the video data 910 is divided twice from the largest coding unit having a long axis size of 64, and the depth is deepened by two layers, so that the long axis size is 32, 16. Up to coding units may be included.
- the coding unit 935 of the video data 930 is divided once from coding units having a long axis size of 16, and the depth of the video data 930 is deepened by one layer to make the long axis size 8. Up to coding units may be included.
- the coding unit 925 of the video data 920 is divided three times from the largest coding unit having a long axis size of 64, and the depth is three layers deep. , Up to 8 coding units may be included. As the depth increases, the expressive power of the detailed information may be improved.
- FIG. 10A is a block diagram of an image encoder 1000 based on coding units, according to various embodiments.
- the image encoder 1000 includes operations performed by the encoder 910 of the video encoding apparatus 900 to encode image data. That is, the intra predictor 1004 performs intra prediction on the coding unit of the intra mode among the current frame 1002, and the motion estimator 1006 and the motion compensator 1008 perform the current frame 1002 in the inter mode. And the inter frame estimation and motion compensation using the reference frame 1026.
- Data output from the intra predictor 1004, the motion estimator 1006, and the motion compensator 1008 is output as a quantized transform coefficient through the transform unit 1010 and the quantization unit 1012.
- the quantized transform coefficients are restored to the data of the spatial domain through the inverse quantizer 1018 and the inverse transformer 1020, and the recovered data of the spatial domain is passed through the deblocking unit 1022 and the offset compensator 1024. Processing is performed and output to the reference frame 1026.
- the quantized transform coefficients may be output to the bitstream 1016 via the entropy encoder 1014.
- an intra predictor 1004, a motion estimator 1006, a motion compensator 1008, and a transform unit, which are components of the image encoder 1000, may be used.
- 1010, quantizer 1012, entropy encoder 1014, inverse quantizer 1018, inverse transform unit 1020, deblocking unit 1022, and offset compensator 1024 are all maximal for each largest coding unit. In consideration of the depth, a task based on each coding unit among the coding units having a tree structure should be performed.
- the intra predictor 1004, the motion estimator 1006, and the motion compensator 1008 consider partitions of each coding unit among the coding units having a tree structure in consideration of the maximum size and the maximum depth of the current maximum coding unit. And a prediction mode, and the transformer 1010 should determine the size of a transform unit in each coding unit among the coding units having a tree structure.
- FIG. 10B is a block diagram of an image decoder 1050 based on coding units, according to various embodiments.
- the bitstream 1052 is parsed through the parser 1054, and the encoded image data to be decoded and information about encoding necessary for decoding are parsed.
- the encoded image data is output as inverse quantized data through the entropy decoding unit 1056 and the inverse quantization unit 1058, and the image data of the spatial domain is restored through the inverse transformation unit 1060.
- the intra predictor 1062 performs intra prediction on the coding unit of the intra mode, and the motion compensator 1064 uses the reference frame 1070 together with the coding unit of the inter mode. Perform motion compensation for the
- Data in the spatial domain that has passed through the intra predictor 1062 and the motion compensator 1064 may be post-processed through the deblocking unit 1066 and the offset compensator 1068 and output to the reconstructed frame 1072.
- the post-processed data through the deblocking unit 1066 and the loop filtering unit 1068 may be output as the reference frame 1070.
- step-by-step operations after the parser 1054 of the image decoder 1050 may be performed.
- a parser 1054 In order to be applied to the video decoding apparatus 950, a parser 1054, an entropy decoder 1056, an inverse quantizer 1058, and an inverse transform unit 1060 that are components of the image decoder 1050 may be used. ), The intra predictor 1062, the motion compensator 1064, the deblocking unit 1066, and the offset compensator 1068 must all perform operations based on coding units having a tree structure for each largest coding unit. do.
- the intra predictor 1062 and the motion compensator 1064 determine a partition and a prediction mode for each coding unit having a tree structure, and the inverse transform unit 1060 should determine the size of a transformation unit for each coding unit. .
- the encoding operation of FIG. 10A and the decoding operation of FIG. 10B describe the video stream encoding operation and the decoding operation in a single layer, respectively. Therefore, when the scalable video encoding apparatus 1200 of FIG. 12A encodes a video stream of two or more layers, the scalable video encoding apparatus 1200 may include an image encoder 1000 for each layer. Similarly, if the scalable video decoding apparatus 1250 of FIG. 12B decodes video streams of two or more layers, it may include an image decoder 1050 for each layer.
- FIG. 11 is a diagram illustrating deeper coding units according to depths, and partitions, according to various embodiments.
- the video encoding apparatus 800 and the video decoding apparatus 850 use hierarchical coding units to consider image characteristics.
- the maximum height, width, and maximum depth of the coding unit may be adaptively determined according to the characteristics of the image, and may be variously set according to a user's request. According to the maximum size of the preset coding unit, the size of the coding unit for each depth may be determined.
- the hierarchical structure 1100 of a coding unit illustrates a case in which a maximum height and a width of a coding unit are 64 and a maximum depth is three.
- the maximum depth indicates the total number of divisions from the maximum coding unit to the minimum coding unit. Since the depth deepens along the vertical axis of the hierarchical structure 1100 of the coding unit, the height and the width of the coding unit for each depth are respectively divided.
- a prediction unit and a partition on which the prediction encoding of each deeper coding unit is shown along the horizontal axis of the hierarchical structure 1100 of the coding unit is illustrated.
- the coding unit 1110 has a depth of 0 as a maximum coding unit of the hierarchical structure 1100 of the coding unit, and a size, that is, a height and a width, of the coding unit is 64x64.
- a depth deeper along the vertical axis includes a coding unit 1120 having a depth of 32x32, a coding unit 1130 having a depth of 16x16, and a coding unit 1140 having a depth of 8x8.
- a coding unit 1140 of depth 3 having a size of 8 ⁇ 8 is a minimum coding unit.
- Prediction units and partitions of the coding unit are arranged along the horizontal axis for each depth. That is, if the coding unit 1110 of size 64x64 having a depth of zero is a prediction unit, the prediction unit is a partition 1110 of size 64x64 included in the coding unit 1110 of size 64x64, partitions 1112 of size 64x32 and size 32x64 partitions 1114, and 32x32 partitions 1116.
- the prediction unit of the coding unit 1120 having a size of 32x32 having a depth of 1 includes a partition 1120 having a size of 32x32, partitions 1122 having a size of 32x16, and a partition having a size of 16x32 included in the coding unit 1120 having a size of 32x32. 1124, partitions 1126 of size 16x16.
- the prediction unit of the coding unit 1130 having a size of 16x16 having a depth of 2 includes a partition 1130 having a size of 16x16, partitions 1132 having a size of 16x8, and a partition having a size of 8x16 included in the coding unit 1130 having a size of 16x16. 1134, partitions 1136 of size 8x8.
- the prediction unit of the coding unit 1140 of size 8x8 having a depth of 3 includes a partition 1140 of size 8x8, partitions 1142 of size 8x4 and a partition of size 4x8 included in the coding unit 1140 of size 8x8. 144, partitions 1146 of size 4x4.
- the encoder 810 of the video encoding apparatus 100 encodes each coding unit of each depth included in the maximum coding unit 1110 to determine a coding depth of the maximum coding unit 1110. Should be performed.
- the number of deeper coding units according to depths for including data having the same range and size increases as the depth increases. For example, four coding units of depth 2 are required for data included in one coding unit of depth 1. Therefore, in order to compare the encoding results of the same data for each depth, each of the coding units having one depth 1 and four coding units having four depths 2 should be encoded.
- encoding may be performed for each prediction unit of a coding unit according to depths along a horizontal axis of the hierarchical structure 1100 of the coding unit, and a representative coding error, which is the smallest coding error at a corresponding depth, may be selected. .
- a depth deeper along the vertical axis of the hierarchical structure 1100 of the coding unit encoding may be performed for each depth, and a minimum encoding error may be searched by comparing the representative encoding error for each depth.
- the depth and the partition in which the minimum coding error occurs in the maximum coding unit 1110 may be selected as the coding depth and the partition type of the maximum coding unit 1110.
- FIG. 12 illustrates a relationship between a coding unit and transformation units, according to various embodiments.
- the video encoding apparatus 800 encodes or decodes an image in coding units having a size smaller than or equal to the maximum coding unit for each maximum coding unit.
- the size of a transformation unit for transformation in the encoding process may be selected based on a data unit that is not larger than each coding unit.
- the 32x32 transform unit 1220 may be used. The conversion can be performed.
- the data of the 64x64 coding unit 1210 is transformed and encoded into 32x32, 16x16, 8x8, and 4x4 size transformation units of 64x64 size or less, and the transformation unit having the least error with the original is selected. Can be.
- FIG. 13 is a diagram of deeper encoding information according to depths, according to various embodiments.
- the output unit 820 of the video encoding apparatus 100 is information about an encoding mode, and information about a partition type 1300 and information 1310 about a prediction mode for each coding unit of each coded depth.
- the information about the transform unit size may be encoded and transmitted.
- the information about the partition type 1300 is a data unit for predictive encoding of the current coding unit and indicates information about a partition type in which the prediction unit of the current coding unit is divided.
- the current coding unit CU_0 of size 2Nx2N is any one of a partition 1302 of size 2Nx2N, a partition 1304 of size 2NxN, a partition 1306 of size Nx2N, and a partition 1308 of size NxN. It can be divided and used.
- the information 1300 on the partition type of the current coding unit represents one of a partition 1302 of size 2Nx2N, a partition 1304 of size 2NxN, a partition 1306 of size Nx2N, and a partition 1308 of size NxN. It is set to.
- Information 1310 about the prediction mode indicates a prediction mode of each partition. For example, through the information 1310 about the prediction mode, whether the partition indicated by the information about the partition type 1300 is performed in one of the intra mode 1312, the inter mode 1314, and the skip mode 1316 is performed. Whether or not can be set.
- the information 1320 about the size of the transformation unit indicates which transformation unit is to be converted based on the current coding unit.
- the transform unit may be one of a first intra transform unit size 1322, a second intra transform unit size 1324, a first inter transform unit size 1326, and a second inter transform unit size 1328. have.
- the reception extractor 860 of the video decoding apparatus 850 may include information about a partition type 1300, information 1310 about a prediction mode, and a transform unit size for each depth-based coding unit.
- the information 1320 can be extracted and used for decoding.
- FIG. 14 is a diagram illustrating deeper coding units according to depths, according to various embodiments.
- Segmentation information may be used to indicate a change in depth.
- the split information indicates whether a coding unit of a current depth is split into coding units of a lower depth.
- the prediction unit 1410 for prediction encoding of the coding unit 1400 having depth 0 and 2N_0x2N_0 size includes a partition type 1412 having a size of 2N_0x2N_0, a partition type 1414 having a size of 2N_0xN_0, a partition type 1416 having a size of N_0x2N_0, and N_0xN_0 It may include a partition type 1418 of size. Although only partitions 1412, 1414, 1416, 1418 in which the prediction unit is divided in symmetric proportions are illustrated, as described above, the partition type is not limited thereto, and asymmetric partitions, arbitrary partitions, geometric partitions, and the like. It may include.
- prediction coding For each partition type, prediction coding must be performed repeatedly for one 2N_0x2N_0 partition, two 2N_0xN_0 partitions, two N_0x2N_0 partitions, and four N_0xN_0 partitions.
- prediction encoding For partitions having a size 2N_0x2N_0, a size N_0x2N_0, a size 2N_0xN_0, and a size N_0xN_0, prediction encoding may be performed in an intra mode and an inter mode. The skip mode may be performed only for prediction encoding on partitions having a size of 2N_0x2N_0.
- the depth 0 is changed to 1 and divided (1420), and iteratively encoded for the depth 2 and the coding units 1430 of the partition type of size N_0xN_0.
- the depth 1 is changed to the depth 2 and divided (1450), and repeatedly for the coding units 1460 of the depth 2 and the size N_2xN_2.
- the encoding may be performed to search for a minimum encoding error.
- depth-based coding units may be set until depth d-1, and split information may be set up to depth d-2. That is, when encoding is performed from the depth d-2 to the depth d-1 and the encoding is performed to the depth d-1, the prediction encoding of the coding unit 1480 of the depth d-1 and the size 2N_ (d-1) x2N_ (d-1)
- the prediction unit 1490 for is a partition type 1452 of size 2N_ (d-1) x2N_ (d-1), partition type 1494 of size 2N_ (d-1) xN_ (d-1), size A partition type 1496 of N_ (d-1) x2N_ (d-1) and a partition type 1498 of size N_ (d-1) xN_ (d-1) may be included.
- one partition 2N_ (d-1) x2N_ (d-1), two partitions 2N_ (d-1) xN_ (d-1), two sizes N_ (d-1) x2N_ Prediction encoding is repeatedly performed for each partition of (d-1) and four partitions of size N_ (d-1) xN_ (d-1), so that a partition type having a minimum encoding error may be searched. .
- the coding unit CU_ (d-1) of the depth d-1 is no longer
- the coded depth for the current maximum coding unit 1400 may be determined as the depth d-1 and the partition type may be determined as N_ (d-1) xN_ (d-1) without going through a division process into lower depths.
- split information is not set for the coding unit 1452 of the depth d-1.
- the data unit 1499 may be referred to as a 'minimum unit' for the current maximum coding unit.
- the minimum unit may be a square data unit having a size obtained by dividing the minimum coding unit, which is the lowest coding depth, into four divisions.
- the video encoding apparatus 100 compares the encoding errors for each depth of the coding unit 1400, selects a depth at which the smallest encoding error occurs, and determines a coding depth.
- the partition type and the prediction mode may be set to the encoding mode of the coded depth.
- the depth with the smallest error can be determined by comparing the minimum coding errors for all depths of depths 0, 1, ..., d-1, d, and can be determined as the coding depth.
- the coded depth, the partition type of the prediction unit, and the prediction mode may be encoded and transmitted as information about an encoding mode.
- the coding unit since the coding unit must be split from the depth 0 to the coded depth, only the split information of the coded depth is set to '0', and the split information for each depth except the coded depth should be set to '1'.
- the image data and encoding information reception extractor 860 of the video decoding apparatus 850 extracts information about a coding depth and a prediction unit for the coding unit 1400 to decode the coding unit 1412. It is available.
- the video decoding apparatus 850 may identify a depth having split information of '0' as an encoding depth by using split information for each depth, and use the decoding information by using information about an encoding mode for a corresponding depth. have.
- 15, 16, and 17 illustrate a relationship between a coding unit, a prediction unit, and a transformation unit, according to various embodiments.
- the coding units 1510 are coding units according to coding depths, which are determined by the video encoding apparatus 100 according to an embodiment with respect to the maximum coding unit.
- the prediction unit 1560 is partitions of prediction units of each coding depth of each coding depth of the coding unit 1510, and the transformation unit 1570 is transformation units of each coding depth for each coding depth.
- the depth-based coding units 1510 have a depth of 0
- the coding units 1512 have a depth of 1
- the coding units 1514, 1516, 1518, 1528, 1550, and 1552 have a depth of 2.
- the coding units 1520, 1522, 1524, 1526, 1530, 1532, and 1548 have a depth of three
- the coding units 1540, 1542, 1544, and 1546 have a depth of four.
- partitions 1514, 1516, 1522, 1532, 1548, 1550, 1552, and 1554 of the prediction units 1560 have a form in which coding units are split. That is, partitions 1514, 1522, 1550, and 1554 are partition types of 2NxN, partitions 1516, 1548, and 1552 are partition types of Nx2N, and partitions 1532 are partition types of NxN. Prediction units and partitions of the coding units 1510 according to depths are smaller than or equal to each coding unit.
- the image data of the part 1552 of the transformation units 1570 may be transformed or inversely transformed into a data unit having a smaller size than that of the coding unit.
- the transformation units 1514, 1516, 1522, 1532, 1548, 1550, 1552, and 1554 are data units having different sizes or shapes when compared to corresponding prediction units and partitions among the prediction units 1560. That is, even if the video encoding apparatus 800 and the video decoding apparatus 850 according to the embodiment are intra prediction / motion estimation / motion compensation operations and transform / inverse transform operations for the same coding unit, Each can be performed on a separate data unit.
- coding is performed recursively for each coding unit having a hierarchical structure for each largest coding unit to determine an optimal coding unit.
- coding units having a recursive tree structure may be configured.
- the encoding information may include split information about a coding unit, partition type information, prediction mode information, and transformation unit size information. Table 1 below shows an example that can be set in the video encoding apparatus 800 and the video decoding apparatus 850 according to an embodiment.
- the output unit 820 of the video encoding apparatus 100 outputs encoding information about coding units having a tree structure, and the encoding information reception extraction unit of the video decoding apparatus 850 according to an embodiment. 860 may extract encoding information about coding units having a tree structure from the received bitstream.
- the split information indicates whether the current coding unit is split into coding units of a lower depth. If the split information of the current depth d is 0, partition type information, prediction mode, and transform unit size information are defined for the coded depth because the depth in which the current coding unit is no longer divided into the lower coding units is a coded depth. Can be. If it is to be further split by the split information, encoding should be performed independently for each coding unit of the divided four lower depths.
- the prediction mode may be represented by one of an intra mode, an inter mode, and a skip mode.
- Intra mode and inter mode can be defined in all partition types, and skip mode can be defined only in partition type 2Nx2N.
- the partition type information indicates the symmetric partition types 2Nx2N, 2NxN, Nx2N and NxN, in which the height or width of the prediction unit is divided by the symmetrical ratio, and the asymmetric partition types 2NxnU, 2NxnD, nLx2N, nRx2N, which are divided by the asymmetrical ratio.
- the asymmetric partition types 2NxnU and 2NxnD are divided into heights 1: 3 and 3: 1, respectively, and the asymmetric partition types nLx2N and nRx2N are divided into 1: 3 and 3: 1 widths, respectively.
- the conversion unit size may be set to two kinds of sizes in the intra mode and two kinds of sizes in the inter mode. That is, if the transformation unit split information is 0, the size of the transformation unit is set to the size 2Nx2N of the current coding unit. If the transform unit split information is 1, a transform unit having a size obtained by dividing the current coding unit may be set. In addition, if the partition type for the current coding unit having a size of 2Nx2N is a symmetric partition type, the size of the transform unit may be set to NxN, and if the asymmetric partition type is N / 2xN / 2.
- Encoding information of coding units having a tree structure may be allocated to at least one of a coding unit, a prediction unit, and a minimum unit unit of a coding depth.
- the coding unit of the coding depth may include at least one prediction unit and at least one minimum unit having the same encoding information.
- the encoding information held by each adjacent data unit is checked, it may be determined whether the adjacent data units are included in the coding unit having the same coding depth.
- the coding unit of the corresponding coding depth may be identified by using the encoding information held by the data unit, the distribution of the coded depths within the maximum coding unit may be inferred.
- the encoding information of the data unit in the depth-specific coding unit adjacent to the current coding unit may be directly referred to and used.
- the prediction coding when the prediction coding is performed by referring to the neighboring coding unit, the data adjacent to the current coding unit in the coding unit according to depths is encoded by using the encoding information of the adjacent coding units according to depths.
- the neighboring coding unit may be referred to by searching.
- FIG. 18 illustrates a relationship between a coding unit, a prediction unit, and a transformation unit, according to encoding mode information of Table 1.
- FIG. 18 illustrates a relationship between a coding unit, a prediction unit, and a transformation unit, according to encoding mode information of Table 1.
- the maximum coding unit 1800 includes coding units 1802, 1804, 1806, 1812, 1814, 1816, and 1818 of a coded depth. Since one coding unit 1818 is a coding unit of a coded depth, split information may be set to zero.
- the partition type information of the coding unit 1818 having a size of 2Nx2N includes partition types 2Nx2N 1822, 2NxN 1824, Nx2N 1826, NxN 1828, 2NxnU 1834, 2NxnD 1834, and nLx2N 1836. And nRx2N 1838.
- the transform unit split information (TU size flag) is a type of transform index, and a size of a transform unit corresponding to the transform index may be changed according to a prediction unit type or a partition type of a coding unit.
- the partition type information is set to one of the symmetric partition types 2Nx2N (1822), 2NxN (1824), Nx2N (1826), and NxN (1828)
- the conversion unit partition information is 0, the conversion unit of size 2Nx2N ( 1842 is set, and if the transform unit split information is 1, a transform unit 1844 of size N ⁇ N may be set.
- the partition type information is set to one of the asymmetric partition types 2NxnU (1832), 2NxnD (1834), nLx2N (1836), and nRx2N (1838), if the conversion unit partition information (TU size flag) is 0, a conversion unit of size 2Nx2N ( 1852 is set, and if the transform unit split information is 1, a transform unit 1854 of size N / 2 ⁇ N / 2 may be set.
- the conversion unit splitting information (TU size flag) described above with reference to FIG. 12 is a flag having a value of 0 or 1
- the conversion unit splitting information according to an embodiment is not limited to a 1-bit flag and is set to 0 according to a setting. , 1, 2, 3., etc., and may be divided hierarchically.
- the transformation unit partition information may be used as an embodiment of the transformation index.
- the size of the transformation unit actually used may be expressed.
- the video encoding apparatus 100 may encode maximum transform unit size information, minimum transform unit size information, and maximum transform unit split information.
- the encoded maximum transform unit size information, minimum transform unit size information, and maximum transform unit split information may be inserted into the SPS.
- the video decoding apparatus 850 may use the maximum transform unit size information, the minimum transform unit size information, and the maximum transform unit split information to use for video decoding.
- the maximum transform unit split information is defined as 'MaxTransformSizeIndex'
- the minimum transform unit size is 'MinTransformSize'
- the transform unit split information is 0,
- the minimum transform unit possible in the current coding unit is defined as 'RootTuSize'.
- the size 'CurrMinTuSize' can be defined as in relation (1) below.
- 'RootTuSize' which is a transform unit size when the transform unit split information is 0, may indicate a maximum transform unit size that can be adopted in the system. That is, according to relation (1), 'RootTuSize / (2 ⁇ MaxTransformSizeIndex)' is a transformation obtained by dividing 'RootTuSize', which is the size of the transformation unit when the transformation unit division information is 0, by the number of times corresponding to the maximum transformation unit division information. Since the unit size is 'MinTransformSize' is the minimum transform unit size, a smaller value among them may be the minimum transform unit size 'CurrMinTuSize' possible in the current coding unit.
- the maximum transform unit size RootTuSize may vary depending on a prediction mode.
- RootTuSize may be determined according to the following relation (2).
- 'MaxTransformSize' represents the maximum transform unit size
- 'PUSize' represents the current prediction unit size.
- RootTuSize min (MaxTransformSize, PUSize) ......... (2)
- 'RootTuSize' which is a transform unit size when the transform unit split information is 0, may be set to a smaller value among the maximum transform unit size and the current prediction unit size.
- 'RootTuSize' may be determined according to Equation (3) below.
- 'PartitionSize' represents the size of the current partition unit.
- RootTuSize min (MaxTransformSize, PartitionSize) ........... (3)
- the conversion unit size 'RootTuSize' when the conversion unit split information is 0 may be set to a smaller value among the maximum conversion unit size and the current partition unit size.
- the current maximum conversion unit size 'RootTuSize' according to an embodiment that changes according to the prediction mode of the partition unit is only an embodiment, and a factor determining the current maximum conversion unit size is not limited thereto.
- image data of the spatial domain is encoded for each coding unit of the tree structure, and the video decoding method based on the coding units of the tree structure.
- decoding is performed for each largest coding unit, and image data of a spatial region may be reconstructed to reconstruct a picture and a video that is a picture sequence.
- the reconstructed video can be played back by a playback device, stored in a storage medium, or transmitted over a network.
- the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.
- the computer-readable recording medium may include a storage medium such as a magnetic storage medium (eg, a ROM, a floppy disk, a hard disk, etc.) and an optical reading medium (eg, a CD-ROM, a DVD, etc.).
- the scalable video encoding method and / or video encoding method described above with reference to FIGS. 6A to 18 are collectively referred to as the video encoding method of the present invention.
- the scalable video decoding method and / or video decoding method described above with reference to FIGS. 6A to 18 are referred to as the video decoding method of the present invention.
- a video encoding apparatus including the scalable video decoding apparatus 1200, the video encoding apparatus 800, or the image encoder 1000 described above with reference to FIGS. 6A to 18 may be referred to as the video encoding apparatus of the present invention.
- the video decoding apparatus including the scalable video decoding apparatus 1250, the video decoding apparatus 850, or the image decoding unit 1050 described above with reference to FIGS. 6A to 18 may be referred to as the video decoding apparatus of the present invention.
- a computer-readable storage medium in which a program is stored according to an embodiment of the present invention will be described in detail below.
- the disk 26000 described above as a storage medium may be a hard drive, a CD-ROM disk, a Blu-ray disk, or a DVD disk.
- the disk 26000 is composed of a plurality of concentric tracks tr, and the tracks are divided into a predetermined number of sectors Se in the circumferential direction.
- a program for implementing the above-described quantization parameter determination method, video encoding method, and video decoding method may be allocated and stored in a specific region of the disc 26000 which stores the program according to the above-described embodiment.
- a computer system achieved using a storage medium storing a program for implementing the above-described video encoding method and video decoding method will be described below with reference to FIG. 21.
- the computer system 26700 may store a program for implementing at least one of the video encoding method and the video decoding method of the present invention on the disc 26000 using the disc drive 26800.
- the program may be read from the disk 26000 by the disk drive 26800, and the program may be transferred to the computer system 26700.
- a program for implementing at least one of the video encoding method and the video decoding method may be stored in a memory card, a ROM cassette, and a solid state drive (SSD). .
- FIG. 21 illustrates the overall structure of a content supply system 11000 for providing a content distribution service.
- the service area of the communication system is divided into cells of a predetermined size, and wireless base stations 11700, 11800, 11900, and 12000 that serve as base stations are installed in each cell.
- the content supply system 11000 includes a plurality of independent devices.
- independent devices such as a computer 12100, a personal digital assistant (PDA) 12200, a camera 12300, and a mobile phone 12500 may be an Internet service provider 11200, a communication network 11400, and a wireless base station. 11700, 11800, 11900, and 12000 to connect to the Internet 11100.
- PDA personal digital assistant
- the content supply system 11000 is not limited to the structure shown in FIG. 21, and devices may be selectively connected.
- the independent devices may be directly connected to the communication network 11400 without passing through the wireless base stations 11700, 11800, 11900, and 12000.
- the video camera 12300 is an imaging device capable of capturing video images like a digital video camera.
- the mobile phone 12500 is such as Personal Digital Communications (PDC), code division multiple access (CDMA), wideband code division multiple access (W-CDMA), Global System for Mobile Communications (GSM), and Personal Handyphone System (PHS). At least one communication scheme among various protocols may be adopted.
- PDC Personal Digital Communications
- CDMA code division multiple access
- W-CDMA wideband code division multiple access
- GSM Global System for Mobile Communications
- PHS Personal Handyphone System
- the video camera 12300 may be connected to the streaming server 11300 through the wireless base station 11900 and the communication network 11400.
- the streaming server 11300 may stream and transmit the content transmitted by the user using the video camera 12300 through real time broadcasting.
- Content received from the video camera 12300 may be encoded by the video camera 12300 or the streaming server 11300.
- Video data captured by the video camera 12300 may be transmitted to the streaming server 11300 via the computer 12100.
- Video data captured by the camera 12600 may also be transmitted to the streaming server 11300 via the computer 12100.
- the camera 12600 is an imaging device capable of capturing both still and video images, like a digital camera.
- Video data received from the camera 12600 may be encoded by the camera 12600 or the computer 12100.
- Software for video encoding and decoding may be stored in a computer readable recording medium such as a CD-ROM disk, a floppy disk, a hard disk drive, an SSD, or a memory card that the computer 12100 may access.
- video data may be received from the mobile phone 12500.
- the video data may be encoded by a large scale integrated circuit (LSI) system installed in the video camera 12300, the mobile phone 12500, or the camera 12600.
- LSI large scale integrated circuit
- a user is recorded using a video camera 12300, a camera 12600, a mobile phone 12500, or another imaging device.
- the content is encoded and sent to the streaming server 11300.
- the streaming server 11300 may stream and transmit content data to other clients who have requested the content data.
- the clients are devices capable of decoding the encoded content data, and may be, for example, a computer 12100, a PDA 12200, a video camera 12300, or a mobile phone 12500.
- the content supply system 11000 allows clients to receive and play encoded content data.
- the content supply system 11000 enables clients to receive and decode and reproduce encoded content data in real time, thereby enabling personal broadcasting.
- the video encoding apparatus and the video decoding apparatus of the present invention may be applied to encoding and decoding operations of independent devices included in the content supply system 11000.
- the mobile phone 12500 is not limited in functionality and may be a smart phone that can change or expand a substantial portion of its functions through an application program.
- the mobile phone 12500 includes a built-in antenna 12510 for exchanging RF signals with the wireless base station 12000, and displays images captured by the camera 1530 or images received and decoded by the antenna 12510. And a display screen 12520 such as an LCD (Liquid Crystal Display) and an OLED (Organic Light Emitting Diodes) screen for displaying.
- the smartphone 12510 includes an operation panel 12540 including a control button and a touch panel. When the display screen 12520 is a touch screen, the operation panel 12540 further includes a touch sensing panel of the display screen 12520.
- the smart phone 12510 includes a speaker 12580 or another type of audio output unit for outputting voice and sound, and a microphone 12550 or another type of audio input unit for inputting voice and sound.
- the smartphone 12510 further includes a camera 1530 such as a CCD camera for capturing video and still images.
- the smartphone 12510 may be a storage medium for storing encoded or decoded data, such as video or still images captured by the camera 1530, received by an e-mail, or obtained in another form. 12570); And a slot 12560 for mounting the storage medium 12570 to the mobile phone 12500.
- the storage medium 12570 may be another type of flash memory such as an electrically erasable and programmable read only memory (EEPROM) embedded in an SD card or a plastic case.
- EEPROM electrically erasable and programmable read only memory
- FIG. 23 illustrates an internal structure of the mobile phone 12500.
- the power supply circuit 12700 the operation input controller 12640, the image encoder 12720, and the camera interface (12630), LCD control unit (12620), image decoding unit (12690), multiplexer / demultiplexer (12680), recording / reading unit (12670), modulation / demodulation unit (12660) and
- the sound processor 12650 is connected to the central controller 12710 through the synchronization bus 1730.
- the power supply circuit 12700 supplies power to each part of the mobile phone 12500 from the battery pack, thereby causing the mobile phone 12500 to operate. Can be set to an operating mode.
- the central controller 12710 includes a CPU, a read only memory (ROM), and a random access memory (RAM).
- the digital signal is generated in the mobile phone 12500 under the control of the central controller 12710, for example, the digital sound signal is generated in the sound processor 12650.
- the image encoder 12720 may generate a digital image signal, and text data of the message may be generated through the operation panel 12540 and the operation input controller 12640.
- the modulator / demodulator 12660 modulates a frequency band of the digital signal, and the communication circuit 12610 is a band-modulated digital signal. Digital-to-analog conversion and frequency conversion are performed on the acoustic signal.
- the transmission signal output from the communication circuit 12610 may be transmitted to the voice communication base station or the radio base station 12000 through the antenna 12510.
- the sound signal acquired by the microphone 12550 is converted into a digital sound signal by the sound processor 12650 under the control of the central controller 12710.
- the generated digital sound signal may be converted into a transmission signal through the modulation / demodulation unit 12660 and the communication circuit 12610 and transmitted through the antenna 12510.
- the text data of the message is input using the operation panel 12540, and the text data is transmitted to the central controller 12610 through the operation input controller 12640.
- the text data is converted into a transmission signal through the modulator / demodulator 12660 and the communication circuit 12610, and transmitted to the radio base station 12000 through the antenna 12510.
- the image data photographed by the camera 1530 is provided to the image encoder 12720 through the camera interface 12630.
- the image data photographed by the camera 1252 may be directly displayed on the display screen 12520 through the camera interface 12630 and the LCD controller 12620.
- the structure of the image encoder 12720 may correspond to the structure of the video encoding apparatus as described above.
- the image encoder 12720 encodes the image data provided from the camera 1252 according to the video encoding method of the present invention described above, converts the image data into compression-encoded image data, and multiplexes / demultiplexes the encoded image data. (12680).
- the sound signal obtained by the microphone 12550 of the mobile phone 12500 is also converted into digital sound data through the sound processor 12650 during recording of the camera 1250, and the digital sound data is converted into the multiplex / demultiplexer 12680. Can be delivered.
- the multiplexer / demultiplexer 12680 multiplexes the encoded image data provided from the image encoder 12720 together with the acoustic data provided from the sound processor 12650.
- the multiplexed data may be converted into a transmission signal through the modulation / demodulation unit 12660 and the communication circuit 12610 and transmitted through the antenna 12510.
- the signal received through the antenna converts the digital signal through a frequency recovery (Analog-Digital conversion) process .
- the modulator / demodulator 12660 demodulates the frequency band of the digital signal.
- the band demodulated digital signal is transmitted to the video decoder 12690, the sound processor 12650, or the LCD controller 12620 according to the type.
- the mobile phone 12500 When the mobile phone 12500 is in the call mode, the mobile phone 12500 amplifies a signal received through the antenna 12510 and generates a digital sound signal through frequency conversion and analog-to-digital conversion processing.
- the received digital sound signal is converted into an analog sound signal through the modulator / demodulator 12660 and the sound processor 12650 under the control of the central controller 12710, and the analog sound signal is output through the speaker 12580. .
- a signal received from the radio base station 12000 via the antenna 12510 is converted into multiplexed data as a result of the processing of the modulator / demodulator 12660.
- the output and multiplexed data is transmitted to the multiplexer / demultiplexer 12680.
- the multiplexer / demultiplexer 12680 demultiplexes the multiplexed data to separate the encoded video data stream and the encoded audio data stream.
- the encoded video data stream is provided to the video decoder 12690, and the encoded audio data stream is provided to the sound processor 12650.
- the structure of the image decoder 12690 may correspond to the structure of the video decoding apparatus as described above.
- the image decoder 12690 generates the reconstructed video data by decoding the encoded video data by using the video decoding method of the present invention described above, and displays the reconstructed video data through the LCD controller 1262 through the display screen 1252. ) Can be restored video data.
- video data of a video file accessed from a website of the Internet can be displayed on the display screen 1252.
- the sound processor 1265 may convert the audio data into an analog sound signal and provide the analog sound signal to the speaker 1258. Accordingly, audio data contained in a video file accessed from a website of the Internet can also be reproduced in the speaker 1258.
- the mobile phone 1150 or another type of communication terminal is a transmitting / receiving terminal including both the video encoding apparatus and the video decoding apparatus of the present invention, a transmitting terminal including only the video encoding apparatus of the present invention described above, or the video decoding apparatus of the present invention. It may be a receiving terminal including only.
- FIG. 24 illustrates a digital broadcasting system employing a communication system, according to various embodiments.
- the digital broadcasting system according to the embodiment of FIG. 24 may receive a digital broadcast transmitted through a satellite or terrestrial network using the video encoding apparatus and the video decoding apparatus.
- the broadcast station 12890 transmits the video data stream to the communication satellite or the broadcast satellite 12900 through radio waves.
- the broadcast satellite 12900 transmits a broadcast signal, and the broadcast signal is received by the antenna 12860 in the home to the satellite broadcast receiver.
- the encoded video stream may be decoded and played back by the TV receiver 12610, set-top box 12870, or other device.
- the playback device 12230 can read and decode the encoded video stream recorded on the storage medium 12020 such as a disk and a memory card.
- the reconstructed video signal may thus be reproduced in the monitor 12840, for example.
- the video decoding apparatus of the present invention may also be mounted in the set-top box 12870 connected to the antenna 12860 for satellite / terrestrial broadcasting or the cable antenna 12850 for cable TV reception. Output data of the set-top box 12870 may also be reproduced by the TV monitor 12880.
- the video decoding apparatus of the present invention may be mounted on the TV receiver 12810 instead of the set top box 12870.
- An automobile 12920 with an appropriate antenna 12910 may receive signals from satellite 12800 or radio base station 11700.
- the decoded video may be played on the display screen of the car navigation system 12930 mounted on the car 12920.
- the video signal may be encoded by the video encoding apparatus of the present invention and recorded and stored in a storage medium.
- the video signal may be stored in the DVD disk 12960 by the DVD recorder, or the video signal may be stored in the hard disk by the hard disk recorder 12950.
- the video signal may be stored in the SD card 12970. If the hard disk recorder 12950 includes the video decoding apparatus of the present invention according to an embodiment, the video signal recorded on the DVD disk 12960, the SD card 12970, or another type of storage medium is output from the monitor 12880. Can be recycled.
- the vehicle navigation system 12930 may not include the camera 1530, the camera interface 12630, and the image encoder 12720 of FIG. 23.
- the computer 12100 and the TV receiver 12610 may not include the camera 1250, the camera interface 12630, and the image encoder 12720 of FIG. 23.
- FIG. 25 illustrates a network structure of a cloud computing system using a video encoding apparatus and a video decoding apparatus, according to various embodiments.
- the cloud computing system of the present invention may include a cloud computing server 14100, a user DB 14100, a computing resource 14200, and a user terminal.
- the cloud computing system provides an on demand outsourcing service of computing resources through an information communication network such as the Internet at the request of a user terminal.
- service providers integrate the computing resources of data centers located in different physical locations into virtualization technology to provide users with the services they need.
- the service user does not install and use computing resources such as application, storage, operating system, and security in each user's own terminal, but services in virtual space created through virtualization technology. You can choose as many times as you want.
- a user terminal of a specific service user accesses the cloud computing server 14100 through an information communication network including the Internet and a mobile communication network.
- the user terminals may be provided with a cloud computing service, particularly a video playback service, from the cloud computing server 14100.
- the user terminal may be any electronic device capable of accessing the Internet, such as a desktop PC 14300, a smart TV 14400, a smartphone 14500, a notebook 14600, a portable multimedia player (PMP) 14700, a tablet PC 14800, and the like. It can be a device.
- the cloud computing server 14100 may integrate and provide a plurality of computing resources 14200 distributed in a cloud network to a user terminal.
- the plurality of computing resources 14200 include various data services and may include data uploaded from a user terminal.
- the cloud computing server 14100 integrates a video database distributed in various places into a virtualization technology to provide a service required by a user terminal.
- the user DB 14100 stores user information subscribed to a cloud computing service.
- the user information may include login information and personal credit information such as an address and a name.
- the user information may include an index of the video.
- the index may include a list of videos that have been played, a list of videos being played, and a stop time of the videos being played.
- Information about a video stored in the user DB 14100 may be shared among user devices.
- the playback history of the predetermined video service is stored in the user DB 14100.
- the cloud computing server 14100 searches for and plays a predetermined video service with reference to the user DB 14100.
- the smartphone 14500 receives the video data stream through the cloud computing server 14100, the operation of decoding the video data stream and playing the video may be performed by the operation of the mobile phone 12500 described above with reference to FIG. 23. similar.
- the cloud computing server 14100 may refer to a playback history of a predetermined video service stored in the user DB 14100. For example, the cloud computing server 14100 receives a playback request for a video stored in the user DB 14100 from a user terminal. If the video was being played before, the cloud computing server 14100 may have a streaming method different depending on whether the video is played from the beginning or from the previous stop point according to the user terminal selection. For example, when the user terminal requests to play from the beginning, the cloud computing server 14100 streams the video to the user terminal from the first frame. On the other hand, if the terminal requests to continue playing from the previous stop point, the cloud computing server 14100 streams the video to the user terminal from the frame at the stop point.
- the user terminal may include the video decoding apparatus as described above with reference to FIGS. 1A through 18.
- the user terminal may include the video encoding apparatus as described above with reference to FIGS. 1A through 18.
- the user terminal may include both the video encoding apparatus and the video decoding apparatus as described above with reference to FIGS. 1A through 18.
- FIGS. 19 to 25 various embodiments in which the above-described video encoding method, video decoding method, video encoding apparatus, and video decoding apparatus are utilized are described above with reference to FIGS. 1A to 18. However, various embodiments in which the video encoding method and the video decoding method described above with reference to FIGS. 1A through 18 are stored in a storage medium, or in which the video encoding apparatus and the video decoding apparatus are implemented in the device, are illustrated in FIGS. 19 to 25. It is not limited to.
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Abstract
Description
분할 정보 0 (현재 심도 d의 크기 2Nx2N의 부호화 단위에 대한 부호화) | 분할 정보 1 | ||||
예측 모드 | 파티션 타입 | 변환 단위 크기 | 하위 심도 d+1의 부호화 단위들마다 반복적 부호화 | ||
인트라 인터스킵 (2Nx2N) | 대칭형 파티션 타입 | 비대칭형 파티션 타입 | 변환 단위 분할 정보 0 | 변환 단위 분할 정보 1 | |
2Nx2N2NxNNx2NNxN | 2NxnU2NxnDnLx2NnRx2N | 2Nx2N | NxN (대칭형 파티션 타입) N/2xN/2 (비대칭형 파티션 타입) |
Claims (20)
- 텍스쳐 영상에 포함된 참조 블록의 소정 위치의 참조 샘플들로부터, 상기 텍스쳐 영상에 대응되는 깊이 영상의 현재 블록을 분할하는 기준이 되는 기준 값을 결정하는 단계;상기 기준 값과 상기 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 단계;상기 바이너리 맵에 기초하여 상기 현재 블록을 복수의 파티션들로 분할하는 단계; 및상기 현재 블록의 인접 샘플들 및 상기 바이너리 맵에 기초하여 상기 복수의 파티션들에 대한 예측 값들을 결정하는 단계를 포함하는 인터 뷰 비디오 복호화 방법.
- 제1항에 있어서,상기 기준 값을 결정하는 단계는, 상기 참조 블록의 꼭지점에 위치한 참조 샘플들의 평균 값을 기준 값으로 결정하는 것을 특징으로 하는 인터 뷰 비디오 복호화 방법.
- 제1항에 있어서,상기 바이너리 맵의 샘플들은 0 또는 1로 결정되고,상기 바이너리 맵을 결정하는 단계는,상기 참조 샘플이 상기 기준 값보다 큰지 여부에 따라, 상기 참조 샘플에 대응되는 상기 바이너리 맵의 샘플을 결정하는 것을 특징으로 하는 비디오 복호화 방법.
- 제1항에 있어서,상기 복수의 파티션은 상기 현재 블록의 좌측 상단에 위치한 샘플을 포함하는 제1 파티션 및 상기 현재 블록의 좌측 상단에 위치한 샘플을 포함하지 않는 제2 파티션을 포함하고,상기 예측 값들을 결정하는 단계는,상기 바이너리 맵의 좌측 상단에 위치한 샘플과 상기 바이너리 맵의 우측 상단에 위치한 샘플을 비교함으로써 수평 에지 플래그를 결정하는 단계;상기 바이너리 맵의 좌측 상단에 위치한 샘플과 상기 바이너리 맵의 좌측 하단에 위치한 샘플을 비교함으로써 수직 에지 플래그를 결정하는 단계; 및상기 수평 에지 플래그, 상기 수직 에지 플래그 및 상기 현재 블록의 인접 샘플들에 기초하여 상기 제1 파티션의 예측 값 및 상기 제2 파티션의 예측 값을 결정하는 단계를 포함하는 것을 특징으로 하는 인터 뷰 복호화 방법.
- 제1항에 있어서,상기 인터 뷰 복호화 방법은,상기 예측 값들 및 상기 현재 블록에 대한 오프셋 정보에 기초하여 상기 현재 블록의 예측 값을 결정하는 단계를 더 포함하는 인터 뷰 비디오 복호화 방법.
- 텍스쳐 영상의 현재 블록에 포함된 파티션에 대응되는 예측 값 참조 블록을 결정하는 단계;상기 텍스쳐 영상과 다른 시점의 깊이 영상으로부터 상기 현재 블록에 대응되는 파티션 참조 블록을 결정하는 단계;상기 파티션 참조 블록의 소정 위치의 참조 샘플들로부터 상기 현재 블록을 분할하는 기준이 되는 기준 값을 결정하는 단계;상기 기준 값과 상기 파티션 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 단계;상기 바이너리 맵에 기초하여 상기 파티션의 영역을 결정하는 단계; 및상기 예측 값 참조 블록들의 샘플들 중 상기 파티션의 영역에 대응되는 샘플들에 기초하여, 상기 파티션의 영역에 포함된 샘플들에 대한 예측 값들을 결정하는 단계를 포함하는 인터 뷰 비디오 복호화 방법.
- 제6항에 있어서,상기 기준 값을 결정하는 단계는, 상기 파티션 참조 블록의 꼭지점에 위치한 참조 샘플들의 평균 값을 기준 값으로 결정하는 것을 특징으로 하는 인터 뷰 비디오 복호화 방법.
- 제6항에 있어서,상기 바이너리 맵의 샘플들은 0 또는 1로 결정되고,상기 바이너리 맵을 결정하는 단계는,상기 참조 샘플이 상기 기준 값보다 큰지 여부에 따라, 상기 참조 샘플에 대응되는 상기 바이너리 맵의 샘플을 결정하는 것을 특징으로 하는 비디오 복호화 방법.
- 제6항에 있어서,상기 파티션 참조 블록을 결정하는 단계는,상기 현재 블록에 대응되는 차이 벡터 및 상기 현재 블록이 참조 하는 참조 시점 영상를 가리키는 참조 시점 인덱스에 기초하여, 상기 파티션 참조 블록을 결정하는 것을 특징으로 하는 인터 뷰 복호화 방법.
- 제6항에 있어서,상기 예측 값 참조 블록을 결정하는 단계는,상기 파티션에 대응되는 움직임 벡터 및 상기 파티션이 참조하는 참조 영상을 나타내는 참조 인덱스 또는 상기 파티션에 대응되는 차이 벡터 및 상기 파티션이 참조하는 참조 시점 영상을 나타내는 참조 시점 인덱스 에 기초하여 예측 값 참조 블록을 결정하는 것을 특징으로 하는 인터 뷰 비디오 복호화 방법.
- 텍스쳐 영상의 참조 블록의 소정 위치의 참조 샘플들로부터, 상기 텍스쳐 영상에 대응되는 깊이 영상의 현재 블록을 분할하는 기준이 되는 기준 값을 결정하고, 상기 기준 값과 상기 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 바이너리 맵 결정부; 및상기 바이너리 맵에 기초하여 상기 현재 블록을 복수의 파티션들로 분할하고, 상기 현재 블록의 인접 샘플들 및 상기 바이너리 맵에 기초하여 상기 복수의 파티션들에 대한 예측 값들을 결정하는 예측 값 결정부를 포함하는 인터 뷰 비디오 복호화 장치.
- 텍스쳐 영상의 현재 블록에 포함된 파티션에 대응되는 예측 값 참조 블록을 결정하는 예측 값 참조 블록 결정부;상기 텍스쳐 영상과 다른 시점의 깊이 영상으로부터 상기 현재 블록에 대응되는 파티션 참조 블록을 결정하는 파티션 참조 블록 결정부;상기 파티션 참조 블록의 소정 위치의 참조 샘플들로부터 상기 현재 블록을 분할하는 기준이 되는 기준 값을 결정하고, 상기 기준 값과 상기 파티션 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 바이너리 맵 결정부; 및상기 바이너리 맵에 기초하여 상기 파티션의 영역을 결정하고 상기 예측 값 참조 블록들의 샘플들 중 상기 파티션의 영역에 대응되는 샘플들에 기초하여, 상기 파티션의 영역에 포함된 샘플들에 대한 예측 값들을 결정하는 예측 값 결정부를 포함하는 인터 뷰 비디오 복호화 장치.
- 텍스쳐 영상의 참조 블록의 소정 위치의 참조 샘플들로부터, 상기 텍스쳐 영상에 대응되는 깊이 이미지의 현재 블록을 분할하는 기준이 되는 기준 값을 결정하는 단계;상기 기준 값과 상기 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 단계;상기 바이너리 맵에 기초하여 상기 현재 블록을 복수의 파티션들로 분할하는 단계; 및상기 현재 블록의 인접 샘플들 및 상기 바이너리 맵에 기초하여 상기 복수의 파티션들에 대한 예측값들을 결정하는 단계를 포함하는 인터 뷰 비디오 부호화 방법.
- 텍스쳐 영상의 현재 블록에 포함된 파티션에 대응되는 예측 값 참조 블록을 결정하는 단계;상기 텍스쳐 영상과 다른 시점의 깊이 영상으로부터 상기 현재 블록에 대응되는 파티션 참조 블록을 결정하는 단계;상기 파티션 참조 블록의 소정 위치의 참조 샘플들로부터 상기 현재 블록을 분할하는 기준이 되는 기준 값을 결정하는 단계;상기 기준 값과 상기 파티션 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 단계;상기 바이너리 맵에 기초하여 상기 파티션의 영역을 결정하는 단계; 및상기 예측 값 참조 블록들의 샘플들 중 상기 파티션의 영역에 대응되는 샘플들에 기초하여, 상기 파티션의 영역에 포함된 샘플들에 대한 예측 값들을 결정하는 단계를 포함하는 인터 뷰 비디오 부호화 방법.
- 텍스쳐 영상의 참조 블록의 소정 위치의 참조 샘플들로부터, 상기 텍스쳐 영상에 대응되는 깊이 이미지 의 현재 블록을 분할하는 기준이 되는 기준 값을 결정하고, 상기 기준 값과 상기 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 바이너리 맵 결정부; 및상기 바이너리 맵에 기초하여 상기 현재 블록을 복수의 파티션들로 분할하고, 상기 현재 블록의 인접 샘플들 및 상기 바이너리 맵에 기초하여 상기 복수의 파티션들에 대한 예측 값들을 결정하는 예측 값 결정부를 포함하는 인터 뷰 비디오 부호화 장치.
- 텍스쳐 영상의 현재 블록에 포함된 파티션에 대응되는 예측 값 참조 블록을 결정하는 예측 값 참조 블록 결정부;상기 텍스쳐 영상과 다른 시점의 깊이 영상으로부터 상기 현재 블록에 대응되는 파티션 참조 블록을 결정하는 파티션 참조 블록 결정부;상기 파티션 참조 블록의 소정 위치의 참조 샘플들로부터 상기 현재 블록을 분할하는 기준이 되는 기준 값을 결정하고, 상기 기준 값과 상기 파티션 참조 블록의 참조 샘플들을 비교하여 상기 현재 블록의 바이너리 맵을 결정하는 바이너리 맵 결정부; 및상기 바이너리 맵에 기초하여 상기 파티션의 영역을 결정하고 상기 예측 값 참조 블록들의 샘플들 중 상기 파티션의 영역에 대응되는 샘플들에 기초하여, 상기 파티션의 영역에 포함된 샘플들에 대한 예측 값들을 결정하는 예측 값 결정부를 포함하는 인터 뷰 비디오 부호화 장치.
- 제1항의 인터 뷰 비디오 복호화 방법을 실행하기 위한 프로그램이 기록된 컴퓨터로 판독 가능한 기록 매체.
- 제6항의 인터 뷰 비디오 복호화 방법을 실행하기 위한 프로그램이 기록된 컴퓨터로 판독 가능한 기록 매체.
- 제13항의 인터 뷰 비디오 부호화 방법을 실행하기 위한 프로그램이 기록된 컴퓨터로 판독 가능한 기록 매체.
- 제14항의 인터 뷰 비디오 부호화 방법을 실행하기 위한 프로그램이 기록된 컴퓨터로 판독 가능한 기록 매체.
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EP3160143A4 (en) | 2018-01-17 |
US10321158B2 (en) | 2019-06-11 |
KR102399593B1 (ko) | 2022-05-18 |
US20170134749A1 (en) | 2017-05-11 |
KR20170019373A (ko) | 2017-02-21 |
EP3160143A1 (en) | 2017-04-26 |
CN106576175A (zh) | 2017-04-19 |
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