WO2019194441A1 - Procédé de codage d'image basé sur une liste de mpm dérivée de façon adaptative, et dispositif associé - Google Patents

Procédé de codage d'image basé sur une liste de mpm dérivée de façon adaptative, et dispositif associé Download PDF

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WO2019194441A1
WO2019194441A1 PCT/KR2019/003388 KR2019003388W WO2019194441A1 WO 2019194441 A1 WO2019194441 A1 WO 2019194441A1 KR 2019003388 W KR2019003388 W KR 2019003388W WO 2019194441 A1 WO2019194441 A1 WO 2019194441A1
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intra prediction
prediction mode
block
current block
neighboring block
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PCT/KR2019/003388
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English (en)
Korean (ko)
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살레히파메흐디
김승환
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엘지전자 주식회사
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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
    • 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
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • 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
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • 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
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • 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
    • 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
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques

Definitions

  • the present invention relates to an image coding technique, and more particularly, to an image decoding method and apparatus according to an MPM list adaptively derived from an image coding system.
  • the demand for high resolution and high quality images such as high definition (HD) images and ultra high definition (UHD) images is increasing in various fields.
  • the higher the resolution and the higher quality of the image data the more information or bit rate is transmitted than the existing image data. Therefore, the image data can be transmitted by using a medium such as a conventional wired / wireless broadband line or by using a conventional storage medium. In the case of storage, the transmission cost and the storage cost are increased.
  • a high efficiency image compression technique is required to effectively transmit, store, and reproduce high resolution, high quality image information.
  • An object of the present invention is to provide a method and apparatus for improving image coding efficiency.
  • Another technical problem of the present invention is to provide an image decoding method and apparatus for deriving an MPM list for a current block.
  • Another technical problem of the present invention is to provide an image decoding method and apparatus for deriving an MPM list based on neighboring blocks of a current block.
  • Another object of the present invention is to provide an image decoding method and apparatus for deriving an MPM list based on the size and / or type of a current block and neighboring blocks.
  • Another object of the present invention is to provide an image decoding method and apparatus for deriving an intra prediction mode for a current block based on sample values of neighboring samples of the current block.
  • an image decoding method performed by a decoding apparatus.
  • the method includes constructing an MPM list of the current block based on neighboring blocks of the current block, deriving an intra prediction mode for the current block based on the MPM list, and based on the intra prediction mode.
  • Generating a predictive sample for the current block wherein the neighboring block includes a left neighboring block and an upper neighboring block of the current block, the size of the current block is WxH, and the upper left sample position of the current block.
  • the left peripheral block is a block including a sample of (-1, H-1) coordinates
  • the upper peripheral block is a sample of (W-1, -1) coordinates. Characterized in that the block containing.
  • a decoding apparatus for performing image decoding.
  • the decoding apparatus constructs an MPM list of the current block based on neighboring blocks of the current block, derives an intra prediction mode for the current block based on the MPM list, and based on the intra prediction mode.
  • a prediction unit for generating a prediction sample for the neighboring block wherein the neighboring block includes a left neighboring block and an upper neighboring block of the current block, the size of the current block is WxH, and an x component of the upper left sample position of the current block
  • the left peripheral block is a block containing samples of (-1, H-1) coordinates
  • the upper peripheral block includes samples of (W-1, -1) coordinates. It is characterized in that the block.
  • a video encoding method performed by an encoding apparatus may include constructing a Most Probable Mode (MPM) list of the current block based on neighboring blocks of the current block, determining an intra prediction mode for the current block, and based on the intra prediction mode. Generating a prediction sample for, and encoding intra prediction mode information for the current block, wherein the neighboring block includes a left neighboring block and an upper neighboring block of the current block; If the size is WxH and the x component of the top-left sample position of the current block is 0 and the y component is 0, the left peripheral block is a block containing samples of (-1, H-1) coordinates. The upper peripheral block is a block including samples of (W-1, -1) coordinates.
  • MCM Most Probable Mode
  • a video encoding apparatus may be configured to construct a Most Probable Mode (MPM) list of the current block based on neighboring blocks of the current block, determine an intra prediction mode for the current block, and based on the intra prediction mode.
  • MPM Most Probable Mode
  • the MPM list for the current block may be configured in consideration of neighboring blocks of the current block, thereby reducing the amount of bits for indicating the intra prediction mode of the current block and improving the overall coding efficiency. have.
  • an MPM list for the current block in consideration of the size and / or type of the current block and neighboring blocks, thereby reducing the amount of bits for indicating the intra prediction mode of the current block and Coding efficiency can be improved.
  • the intra prediction mode of the current block can be derived based on the sample values of neighboring samples of the current block, thereby reducing the amount of bits for indicating the intra prediction mode of the current block and improving the overall coding efficiency. Can be improved.
  • FIG. 1 is a diagram schematically illustrating a configuration of a video encoding apparatus to which the present invention may be applied.
  • FIG. 2 is a diagram schematically illustrating a configuration of a video decoding apparatus to which the present invention may be applied.
  • 3 exemplarily shows intra directional modes of 65 prediction directions.
  • 5A and 5B illustrate an example of configuring an MPM list of the current block based on the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block.
  • FIG. 6 illustrates an example of configuring an MPM list of the current block based on the size and type of the current block and neighboring blocks.
  • 8A and 8B illustrate an example of deriving an intra prediction mode of the current block based on neighboring samples of the current block in an encoding device / decoding device.
  • FIG. 9 schematically illustrates an image encoding method by an encoding apparatus according to the present invention.
  • FIG. 10 schematically illustrates an encoding apparatus for performing an image encoding method according to the present invention.
  • FIG. 11 schematically illustrates an image decoding method by a decoding apparatus according to the present invention.
  • FIG. 12 schematically illustrates a decoding apparatus for performing an image decoding method according to the present invention.
  • each configuration in the drawings described in the present invention are shown independently for the convenience of description of the different characteristic functions, it does not mean that each configuration is implemented by separate hardware or separate software.
  • two or more of each configuration may be combined to form one configuration, or one configuration may be divided into a plurality of configurations.
  • Embodiments in which each configuration is integrated and / or separated are also included in the scope of the present invention without departing from the spirit of the present invention.
  • the present invention relates to video / image coding.
  • the method / embodiment disclosed herein may be applied to the method disclosed in the versatile video coding (VVC) standard or the next generation video / image coding standard.
  • VVC versatile video coding
  • a picture generally refers to a unit representing one image in a specific time zone, and a slice / tile is a unit constituting a part of a picture in coding.
  • the slice / tile may comprise one or more coding tree units (CTUs).
  • CTUs coding tree units
  • One picture may consist of a plurality of slices / tiles, and one tile group may include one or more tiles.
  • a pixel or a pel may refer to a minimum unit constituting one picture (or image). Also, 'sample' may be used as a term corresponding to a pixel.
  • a sample may generally represent a pixel or a value of a pixel, and may only represent pixel / pixel values of the luma component, or only pixel / pixel values of the chroma component.
  • a unit represents the basic unit of image processing.
  • the unit may include at least one of a specific region of the picture and information related to the region.
  • the unit may be used interchangeably with terms such as block or area in some cases.
  • an M ⁇ N block may represent a set of samples or transform coefficients composed of M columns and N rows.
  • FIG. 1 is a diagram schematically illustrating a configuration of a video encoding apparatus to which the present invention may be applied.
  • the video encoding apparatus 100 may include a picture splitter 105, a predictor 110, a residual processor 120, an entropy encoder 130, an adder 140, and a filter 150. ) And memory 160.
  • the residual processing unit 120 may include a subtraction unit 121, a conversion unit 122, a quantization unit 123, a reordering unit 124, an inverse quantization unit 125, and an inverse conversion unit 126.
  • the picture divider 105 may divide the input picture into at least one processing unit.
  • the processing unit may be called a coding unit (CU).
  • the coding unit may be recursively split from the largest coding unit (LCU) according to a quad-tree binary-tree (QTBT) structure.
  • LCU largest coding unit
  • QTBT quad-tree binary-tree
  • one coding unit may be divided into a plurality of coding units of a deeper depth based on a quad tree structure and / or a binary tree structure.
  • the quad tree structure may be applied first and the binary tree structure may be applied later.
  • the binary tree structure may be applied first.
  • the coding procedure according to the present invention may be performed based on the final coding unit that is no longer split.
  • the maximum coding unit may be used as the final coding unit immediately based on coding efficiency according to the image characteristic, or if necessary, the coding unit is recursively divided into coding units of lower depths and optimized.
  • a coding unit of size may be used as the final coding unit.
  • the coding procedure may include a procedure of prediction, transform, and reconstruction, which will be described later.
  • the processing unit may include a coding unit (CU) prediction unit (PU) or a transform unit (TU).
  • the coding unit may be split from the largest coding unit (LCU) into coding units of deeper depths along the quad tree structure.
  • LCU largest coding unit
  • the maximum coding unit may be used as the final coding unit immediately based on coding efficiency according to the image characteristic, or if necessary, the coding unit is recursively divided into coding units of lower depths and optimized.
  • a coding unit of size may be used as the final coding unit. If a smallest coding unit (SCU) is set, the coding unit may not be split into smaller coding units than the minimum coding unit.
  • the final coding unit refers to a coding unit that is the basis of partitioning or partitioning into a prediction unit or a transform unit.
  • the prediction unit is a unit partitioning from the coding unit and may be a unit of sample prediction. In this case, the prediction unit may be divided into sub blocks.
  • the transform unit may be divided along the quad tree structure from the coding unit, and may be a unit for deriving a transform coefficient and / or a unit for deriving a residual signal from the transform coefficient.
  • a coding unit may be called a coding block (CB)
  • a prediction unit is a prediction block (PB)
  • a transform unit may be called a transform block (TB).
  • a prediction block or prediction unit may mean a specific area in the form of a block within a picture, and may include an array of prediction samples.
  • a transform block or a transform unit may mean a specific area in a block form within a picture, and may include an array of transform coefficients or residual samples.
  • the prediction unit 110 may perform a prediction on a block to be processed (hereinafter, referred to as a current block) and generate a predicted block including prediction samples of the current block.
  • the unit of prediction performed by the prediction unit 110 may be a coding block, a transform block, or a prediction block.
  • the prediction unit 110 may determine whether intra prediction or inter prediction is applied to the current block. As an example, the prediction unit 110 may determine whether intra prediction or inter prediction is applied on a CU basis.
  • the prediction unit 110 may derive a prediction sample for the current block based on reference samples outside the current block in the picture to which the current block belongs (hereinafter, referred to as the current picture). In this case, the prediction unit 110 may (i) derive the prediction sample based on the average or interpolation of neighboring reference samples of the current block, and (ii) the neighbor reference of the current block.
  • the prediction sample may be derived based on a reference sample present in a specific (prediction) direction with respect to the prediction sample among the samples. In case of (i), it may be called non-directional mode or non-angle mode, and in case of (ii), it may be called directional mode or angular mode.
  • the prediction mode may have, for example, 33 directional prediction modes and at least two non-directional modes.
  • the non-directional mode may include a DC prediction mode and a planner mode (Planar mode).
  • the prediction unit 110 may determine the prediction mode applied to the current block by using the prediction mode applied to the neighboring block.
  • the prediction unit 110 may derive the prediction sample for the current block based on the sample specified by the motion vector on the reference picture.
  • the prediction unit 110 may apply one of a skip mode, a merge mode, and a motion vector prediction (MVP) mode to derive a prediction sample for the current block.
  • the prediction unit 110 may use the motion information of the neighboring block as the motion information of the current block.
  • the skip mode unlike the merge mode, the difference (residual) between the prediction sample and the original sample is not transmitted.
  • the MVP mode the motion vector of the current block may be derived using the motion vector of the neighboring block as a motion vector predictor.
  • the neighboring block may include a spatial neighboring block existing in the current picture and a temporal neighboring block present in the reference picture.
  • a reference picture including the temporal neighboring block may be called a collocated picture (colPic).
  • the motion information may include a motion vector and a reference picture index.
  • Information such as prediction mode information and motion information may be encoded (entropy) and output in the form of a bitstream.
  • the highest picture on the reference picture list may be used as the reference picture.
  • Reference pictures included in a reference picture list may be sorted based on a difference in a picture order count (POC) between a current picture and a corresponding reference picture.
  • POC picture order count
  • the subtraction unit 121 generates a residual sample which is a difference between the original sample and the prediction sample.
  • residual samples may not be generated as described above.
  • the transform unit 122 generates transform coefficients by transforming the residual sample in units of transform blocks.
  • the transform unit 122 may perform the transform according to the size of the transform block and the prediction mode applied to the coding block or the prediction block that spatially overlaps the transform block. For example, if intra prediction is applied to the coding block or the prediction block that overlaps the transform block, and the transform block is a 4 ⁇ 4 residual array, the residual sample is configured to perform a discrete sine transform (DST) transform kernel.
  • the residual sample may be transformed using a discrete cosine transform (DCT) transform kernel.
  • DST discrete sine transform
  • DCT discrete cosine transform
  • the quantization unit 123 may quantize the transform coefficients to generate quantized transform coefficients.
  • the reordering unit 124 rearranges the quantized transform coefficients.
  • the reordering unit 124 may reorder the quantized transform coefficients in the form of a block into a one-dimensional vector form through a coefficient scanning method. Although the reordering unit 124 has been described in a separate configuration, the reordering unit 124 may be part of the quantization unit 123.
  • the entropy encoding unit 130 may perform entropy encoding on the quantized transform coefficients.
  • Entropy encoding may include, for example, encoding methods such as exponential Golomb, context-adaptive variable length coding (CAVLC), context-adaptive binary arithmetic coding (CABAC), and the like.
  • the entropy encoding unit 130 may encode information necessary for video reconstruction other than the quantized transform coefficient (for example, a value of a syntax element) together or separately. Entropy-encoded information may be transmitted or stored in units of network abstraction layer (NAL) units in the form of bitstreams.
  • NAL network abstraction layer
  • the inverse quantization unit 125 inverse quantizes the quantized values (quantized transform coefficients) in the quantization unit 123, and the inverse transformer 126 inverse transforms the inverse quantized values in the inverse quantization unit 125 to obtain a residual sample.
  • the adder 140 reconstructs the picture by combining the residual sample and the predictive sample.
  • the residual sample and the predictive sample may be added in units of blocks to generate a reconstructed block.
  • the adder 140 may be part of the predictor 110.
  • the adder 140 may be called a restoration unit or a restoration block generation unit.
  • the filter unit 150 may apply a deblocking filter and / or a sample adaptive offset to the reconstructed picture. Through deblocking filtering and / or sample adaptive offset, the artifacts of the block boundaries in the reconstructed picture or the distortion in the quantization process can be corrected.
  • the sample adaptive offset may be applied on a sample basis and may be applied after the process of deblocking filtering is completed.
  • the filter unit 150 may apply an adaptive loop filter (ALF) to the reconstructed picture. ALF may be applied to the reconstructed picture after the deblocking filter and / or sample adaptive offset is applied.
  • ALF adaptive loop filter
  • the memory 160 may store reconstructed pictures (decoded pictures) or information necessary for encoding / decoding.
  • the reconstructed picture may be a reconstructed picture after the filtering process is completed by the filter unit 150.
  • the stored reconstructed picture may be used as a reference picture for (inter) prediction of another picture.
  • the memory 160 may store (reference) pictures used for inter prediction.
  • pictures used for inter prediction may be designated by a reference picture set or a reference picture list.
  • FIG. 2 is a diagram schematically illustrating a configuration of a video decoding apparatus to which the present invention may be applied.
  • the video decoding apparatus 200 may include an entropy decoding unit 210, a residual processor 220, a predictor 230, an adder 240, a filter 250, and a memory 260. It may include.
  • the residual processor 220 may include a rearrangement unit 221, an inverse quantization unit 222, and an inverse transform unit 223.
  • the video decoding apparatus 200 may restore video in response to a process in which video information is processed in the video encoding apparatus.
  • the video decoding apparatus 200 may perform video decoding using a processing unit applied in the video encoding apparatus.
  • the processing unit block of video decoding may be, for example, a coding unit, and in another example, a coding unit, a prediction unit, or a transform unit.
  • the coding unit may be split along the quad tree structure and / or binary tree structure from the largest coding unit.
  • the prediction unit and the transform unit may be further used in some cases, in which case the prediction block is a block derived or partitioned from the coding unit and may be a unit of sample prediction. At this point, the prediction unit may be divided into subblocks.
  • the transform unit may be divided along the quad tree structure from the coding unit, and may be a unit for deriving a transform coefficient or a unit for deriving a residual signal from the transform coefficient.
  • the entropy decoding unit 210 may parse the bitstream and output information necessary for video reconstruction or picture reconstruction. For example, the entropy decoding unit 210 decodes information in a bitstream based on a coding method such as exponential Golomb coding, CAVLC, or CABAC, quantized values of syntax elements necessary for video reconstruction, and residual coefficients. Can be output.
  • a coding method such as exponential Golomb coding, CAVLC, or CABAC, quantized values of syntax elements necessary for video reconstruction, and residual coefficients. Can be output.
  • the CABAC entropy decoding method receives a bin corresponding to each syntax element in a bitstream, and decodes syntax element information and decoding information of neighboring and decoding target blocks or information of symbols / bins decoded in a previous step.
  • the context model may be determined using the context model, the probability of occurrence of a bin may be predicted according to the determined context model, and arithmetic decoding of the bin may be performed to generate a symbol corresponding to the value of each syntax element. have.
  • the CABAC entropy decoding method may update the context model by using the information of the decoded symbol / bin for the context model of the next symbol / bean after determining the context model.
  • the information related to the prediction among the information decoded by the entropy decoding unit 210 is provided to the prediction unit 230, and the residual value on which the entropy decoding has been performed by the entropy decoding unit 210, that is, the quantized transform coefficient, is used as a reordering unit ( 221 may be input.
  • the reordering unit 221 may rearrange the quantized transform coefficients in a two-dimensional block form.
  • the reordering unit 221 may perform reordering in response to coefficient scanning performed by the encoding apparatus.
  • the rearrangement unit 221 has been described in a separate configuration, but the rearrangement unit 221 may be part of the inverse quantization unit 222.
  • the inverse quantization unit 222 may dequantize the quantized transform coefficients based on the (inverse) quantization parameter and output the transform coefficients.
  • information for deriving a quantization parameter may be signaled from the encoding apparatus.
  • the inverse transform unit 223 may inversely transform transform coefficients to derive residual samples.
  • the prediction unit 230 may perform prediction on the current block and generate a predicted block including prediction samples for the current block.
  • the unit of prediction performed by the prediction unit 230 may be a coding block, a transform block, or a prediction block.
  • the prediction unit 230 may determine whether to apply intra prediction or inter prediction based on the information about the prediction.
  • a unit for determining which of intra prediction and inter prediction is to be applied and a unit for generating a prediction sample may be different.
  • the unit for generating a prediction sample in inter prediction and intra prediction may also be different.
  • whether to apply inter prediction or intra prediction may be determined in units of CUs.
  • a prediction mode may be determined and a prediction sample may be generated in PU units
  • intra prediction a prediction mode may be determined in PU units and a prediction sample may be generated in TU units.
  • the prediction unit 230 may derive the prediction sample for the current block based on the neighbor reference samples in the current picture.
  • the prediction unit 230 may derive the prediction sample for the current block by applying the directional mode or the non-directional mode based on the neighbor reference samples of the current block.
  • the prediction mode to be applied to the current block may be determined using the intra prediction mode of the neighboring block.
  • the prediction unit 230 may derive the prediction sample for the current block based on the sample specified on the reference picture by the motion vector on the reference picture.
  • the prediction unit 230 may apply any one of a skip mode, a merge mode, and an MVP mode to derive a prediction sample for the current block.
  • motion information required for inter prediction of the current block provided by the video encoding apparatus for example, information about a motion vector, a reference picture index, and the like may be obtained or derived based on the prediction information.
  • the motion information of the neighboring block may be used as the motion information of the current block.
  • the neighboring block may include a spatial neighboring block and a temporal neighboring block.
  • the prediction unit 230 may construct a merge candidate list using motion information of available neighboring blocks, and may use information indicated by the merge index on the merge candidate list as a motion vector of the current block.
  • the merge index may be signaled from the encoding device.
  • the motion information may include a motion vector and a reference picture. When the motion information of the temporal neighboring block is used in the skip mode and the merge mode, the highest picture on the reference picture list may be used as the reference picture.
  • the difference (residual) between the prediction sample and the original sample is not transmitted.
  • the motion vector of the current block may be derived using the motion vector of the neighboring block as a motion vector predictor.
  • the neighboring block may include a spatial neighboring block and a temporal neighboring block.
  • a merge candidate list may be generated by using a motion vector of a reconstructed spatial neighboring block and / or a motion vector corresponding to a Col block, which is a temporal neighboring block.
  • the motion vector of the candidate block selected from the merge candidate list is used as the motion vector of the current block.
  • the information about the prediction may include a merge index indicating a candidate block having an optimal motion vector selected from candidate blocks included in the merge candidate list.
  • the prediction unit 230 may derive the motion vector of the current block by using the merge index.
  • a motion vector predictor candidate list may be generated using a motion vector of a reconstructed spatial neighboring block and / or a motion vector corresponding to a Col block, which is a temporal neighboring block.
  • the prediction information may include a prediction motion vector index indicating an optimal motion vector selected from the motion vector candidates included in the list.
  • the prediction unit 230 may select the predicted motion vector of the current block from the motion vector candidates included in the motion vector candidate list using the motion vector index.
  • the prediction unit of the encoding apparatus may obtain a motion vector difference (MVD) between the motion vector of the current block and the motion vector predictor, and may encode the output vector in a bitstream form. That is, MVD may be obtained by subtracting the motion vector predictor from the motion vector of the current block.
  • the prediction unit 230 may obtain a motion vector difference included in the information about the prediction, and derive the motion vector of the current block by adding the motion vector difference and the motion vector predictor.
  • the prediction unit may also obtain or derive a reference picture index or the like indicating a reference picture from the information about the prediction.
  • the adder 240 may reconstruct the current block or the current picture by adding the residual sample and the predictive sample.
  • the adder 240 may reconstruct the current picture by adding the residual sample and the predictive sample in block units. Since the residual is not transmitted when the skip mode is applied, the prediction sample may be a reconstruction sample.
  • the adder 240 has been described in a separate configuration, the adder 240 may be part of the predictor 230. On the other hand, the adder 240 may be called a restoration unit or a restoration block generation unit.
  • the filter unit 250 may apply the deblocking filtering sample adaptive offset, and / or ALF to the reconstructed picture.
  • the sample adaptive offset may be applied in units of samples and may be applied after deblocking filtering.
  • ALF may be applied after deblocking filtering and / or sample adaptive offset.
  • the memory 260 may store reconstructed pictures (decoded pictures) or information necessary for decoding.
  • the reconstructed picture may be a reconstructed picture after the filtering process is completed by the filter unit 250.
  • the memory 260 may store pictures used for inter prediction.
  • pictures used for inter prediction may be designated by a reference picture set or a reference picture list.
  • the reconstructed picture can be used as a reference picture for another picture.
  • the memory 260 may output the reconstructed picture in an output order.
  • the encoding device / decoding device may derive an intra prediction mode for the current block, and predict the sample of the current block based on the intra prediction mode. Can be derived. That is, the encoding device / decoding device may derive the prediction sample of the current block by applying the directional mode or the non-directional mode based on the peripheral reference samples of the current block.
  • the intra prediction mode includes two non-directional or non-angular intra prediction modes and 65 directional or angular intra prediction modes. Can include them.
  • the non-directional intra prediction modes may include a planar intra prediction mode of 0 and a DC intra prediction mode of 1, and the directional intra prediction modes may include 65 intra prediction modes of 2 to 66. .
  • the present invention may be applied to a case where the number of intra prediction modes is different.
  • the intra prediction mode 67 may further be used, and the intra prediction mode 67 may represent a linear model (LM) mode.
  • LM linear model
  • 3 exemplarily shows intra directional modes of 65 prediction directions.
  • an intra prediction mode having horizontal directionality and an intra prediction mode having vertical directionality may be distinguished from the intra prediction mode 34 having a left upward diagonal prediction direction.
  • H and V in FIG. 3 mean horizontal directionality and vertical directionality, respectively, and numbers of -32 to 32 represent a displacement of 1/32 on a sample grid position.
  • Intra prediction modes 2 to 33 have horizontal orientation, and intra prediction modes 34 to 66 have vertical orientation.
  • Intra prediction mode 18 and intra prediction mode 50 indicate a horizontal intra prediction mode and a vertical intra prediction mode, respectively, and an intra prediction mode 2 indicates a left downward diagonal intra prediction mode,
  • the 34th intra prediction mode may be referred to as a left upward diagonal intra prediction mode, and the 66th intra prediction mode may be referred to as a right upward diagonal intra prediction mode.
  • an intra prediction mode applied to the current block may be derived based on the intra prediction mode of the neighboring block of the current block.
  • the decoding apparatus may derive the most probable mode (MPM) list based on the intra prediction mode and additional candidate modes of the neighboring block (eg, the left neighboring block and / or the upper neighboring block) of the current block.
  • MPM most probable mode
  • One of the MPM candidates in the derived MPM list may be selected based on the received MPM index, or one of the remaining intra prediction modes not included in the MPM candidates is based on intra prediction mode information. Can be selected.
  • the MPM list may be referred to as an intra prediction mode candidate list or may be referred to as candModeList.
  • the MPM list may include three MPM candidates or six MPM candidates.
  • the MPM list may include candidates derived based on an intra prediction mode, a derived intra prediction mode, and / or a default intra prediction mode of a neighboring block.
  • the encoding device / decoding device may search the neighboring blocks of the current block in a specific order and derive the intra prediction mode of the neighboring block as the MPM candidate in the derived order.
  • the neighboring blocks may include a left neighboring block, an upper neighboring block, a lower left neighboring block, a right upper neighboring block, and an upper left neighboring block, and the encoding device / decoding device is an intra prediction mode of the left neighboring block.
  • Intra prediction mode of the upper neighboring block may be derived and the MPM list of the current block may be constructed. Meanwhile, if six MPM candidates are not derived after the search, an MPM candidate may be derived based on an intra prediction mode derived as the MPM candidate. For example, when the intra prediction mode derived as the MPM candidate is N intra prediction mode, the encoding device / decoding device selects the N + 1 intra prediction mode and / or the N-1 intra prediction mode from the current block. Can be derived as an MPM candidate. A detailed description of the neighboring blocks will be described later.
  • an intra prediction mode applied to the current block is included in the MPM candidates or the remaining intra prediction modes may be derived based on an MPM flag.
  • the MPM flag may indicate that the intra prediction mode of the current block is included in MPM candidates (MPM list)
  • MPM list when the value of the MPM flag is 0, the MPM The flag may indicate that an intra prediction mode for the current block is included in the remaining intra prediction modes rather than included in MPM candidates (MPM list).
  • the MPM index may be signaled in the form of an mpm_idx or intra_luma_mpm_idx syntax element, and the remaining intra prediction mode information may be signaled in the form of a rem_intra_luma_pred_mode or intra_luma_mpm_remainder syntax element.
  • the MPM flag may be signaled in the form of an intra_luma_mpm_flag syntax element, and when the MPM flag is not signaled, the value of the MPM flag may be regarded as 1.
  • the remaining intra prediction mode information may index one of the remaining intra prediction modes not included in the MPM candidates among all the intra prediction modes in order of prediction mode number.
  • the intra prediction mode may be an intra prediction mode for a luma component (sample).
  • the intra prediction mode information may include at least one of the MPM flag, the MPM index, and the remaining intra prediction mode information.
  • the MPM list may be called in various terms such as an MPM candidate list and a candModeList.
  • the encoding apparatus may derive an MPM list for the current block based on the intra prediction mode and additional candidate modes of the neighboring block of the current block, determine the intra prediction mode of the current block, and determine the current block.
  • Intra prediction mode information for may be encoded and stored and / or transmitted.
  • the current block and the neighboring block to be coded may have similar image characteristics, and thus, the current block and the neighboring block have a high probability of having the same or similar intra prediction mode.
  • the MPM list of the current block may be determined to derive an intra prediction mode applied to the block. That is, as the MPM list includes the intra prediction mode of the current block, the coding efficiency of the entire image may be improved.
  • a small bit amount is allocated to the value of the MPM index indicating an earlier order of MPM candidates in the MPM list. As the case where an MPM candidate of the previous order in the MPM list is selected as an intra prediction mode of the current block increases It is possible to reduce the amount of bits for coding the entire image and to improve coding efficiency.
  • the present invention increases the accuracy of the MPM list construction, that is, the case where the MPM candidates in the preceding order (for example, the first order) of the MPM list are increased when the intra prediction mode of the current block is selected.
  • the neighboring block of the current block may be represented as follows.
  • a neighboring block of the current block may include a left neighboring block, an upper neighboring block, a lower left neighboring block, a right upper neighboring block, and / or a left upper neighboring block.
  • the left neighboring block has a coordinate of (-1, H-1).
  • a block including a sample the upper peripheral block is a block including a sample of (W-1, -1) coordinates, the right upper peripheral block is a block including a sample of (W, -1) coordinates,
  • the lower left peripheral block may be a block including samples of (-1, H) coordinates, and the upper left peripheral block may be a block including samples of (-1, -1) coordinates.
  • a method of constructing the MPM list of the current block may be proposed based on an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block.
  • 5A and 5B illustrate an example of configuring an MPM list of the current block based on the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block.
  • the encoding apparatus / decoding apparatus may determine whether an intra prediction mode of a left neighboring block and an intra prediction mode of an upper neighboring block exist in the current block (S500).
  • the intra prediction mode of the left neighboring block of the current block may be represented as dir_Left
  • the intra prediction mode of the upper neighboring block of the current block may be represented as dir_Above.
  • the left neighboring block has a coordinate of (-1, H-1).
  • the block may include a sample
  • the upper peripheral block may be a block including a sample having a coordinate (W-1, -1).
  • the encoding device / decoding device is configured to the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block. It may be determined whether a specific condition is satisfied (S510). When the specific condition is satisfied, the encoding apparatus / decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the first order of the MPM list of the current block (S520). In addition, when the specific condition is not satisfied, the encoding apparatus / decoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidate of the first order of the MPM list of the current block (S530).
  • FIG. 5B illustrates an example of constructing an MPM list using whether the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block are intra prediction modes having a vertical direction under the specific condition.
  • the intra prediction mode having the vertical direction may represent an intra prediction mode having an angle parameter larger than the intra prediction mode having the upper left diagonal prediction direction.
  • the intra prediction mode having the vertical direction may represent the intra prediction modes 35 to 66.
  • the intra prediction mode having the vertical direction may be N intra prediction modes, and N may be a number greater than 34 (N> 34).
  • the encoding apparatus / decoding apparatus may determine whether an intra prediction mode of a left neighboring block and an intra prediction mode of an upper neighboring block exist in the current block (S540).
  • the left neighboring block has a coordinate of (-1, H-1).
  • the block may include a sample
  • the upper peripheral block may be a block including a sample having a coordinate (W-1, -1).
  • the encoding device / decoding device may have an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block. It may be determined whether the intra prediction mode has the vertical direction (S550). When the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block are intra prediction modes having vertical directionality, the encoding device / decoding device sets the intra prediction mode of the upper neighboring block to the MPM list of the current block. The first order may be derived as the MPM candidate (S560).
  • the encoding device / decoding device sets the intra prediction mode of the left neighboring block to the current. It may be derived as the MPM candidate in the first order of the MPM list of the block (S570).
  • the MPM list of the current block may be constructed based on various conditions other than the above.
  • the encoding device / decoding device may determine whether an intra prediction mode of the upper neighboring block is an intra prediction mode having vertical orientation. When the intra prediction mode of the upper neighboring block is an intra prediction mode having vertical direction, the encoding device / decoding device may derive the intra prediction mode of the upper neighboring block as the MPM candidate of the first order of the MPM list of the current block. And the intra prediction mode of the upper neighboring block is not the intra prediction mode having the vertical direction, the encoding device / decoding device sets the intra prediction mode of the left neighboring block as the MPM candidate of the first order of the MPM list of the current block. Can be derived.
  • the encoding apparatus / decoding apparatus may determine whether the intra prediction mode of the upper right side neighboring block and the intra prediction mode of the lower left side neighboring block are the intra prediction modes having the vertical direction. When the intra prediction mode of the upper right neighboring block and the intra prediction mode of the lower left neighboring block are the intra prediction modes having vertical directionality, the encoding device / decoding device sets the intra prediction mode of the right upper neighboring block of the current block.
  • the decoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidate in the first order of the MPM list of the current block.
  • the encoding device / decoding device may determine whether the intra prediction mode of the right upper neighboring block is an intra prediction mode having vertical orientation. When the intra prediction mode of the right upper neighboring block is an intra prediction mode having vertical direction, the encoding device / decoding device derives the intra prediction mode of the right upper neighboring block as the MPM candidate of the first order of the MPM list of the current block. If the intra prediction mode of the right upper neighboring block is not an intra prediction mode having vertical directionality, the encoding device / decoding device sets the intra prediction mode of the lower left neighboring block in the first order of the MPM list of the current block. Can be derived as an MPM candidate.
  • the encoding apparatus / decoding apparatus may configure the MPM list in any order according to the prediction direction of the intra prediction mode of the neighboring block of the current block.
  • the MPM list As an example of constructing the MPM list, a method of constructing the MPM list of the current block based on the size and type of the current block and neighboring blocks may be proposed.
  • FIG. 6 illustrates an example of configuring an MPM list of the current block based on the size and type of the current block and neighboring blocks.
  • the encoding device / decoding device may derive the size and type of the current block and neighboring blocks (S600).
  • the peripheral block may include the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block, and / or the upper left peripheral block of the current block.
  • the type of block may be a square block or a non-square block.
  • List 1, List 2, and List 3 may be preset, and the MPM list of the current block is List 1, List 2, or List 3 based on Specific Condition 1, Specific Condition 2, and Specific Condition 3. Can be configured.
  • the encoding device / decoding device may determine whether the size and type of the current block and / or the neighboring block satisfy a specific condition 1 (S610). When the size and type of the current block and / or the neighboring block satisfy a specific condition 1, the encoding device / decoding device may configure the MPM list of the current block as list 1 (S620).
  • the encoding device / decoding device determines whether the size and type of the current block and / or neighboring block satisfy the specific condition 2. It may be (S630). When the size and type of the current block and / or the neighboring block satisfy a specific condition 2, the encoding device / decoding device may configure the MPM list of the current block as list 2 (S640).
  • the encoding device / decoding device determines whether the size and type of the current block and / or neighboring block satisfies specific condition 3. Can be (S650). When the size and type of the current block and / or the neighboring block satisfy a specific condition 3, the encoding device / decoding device may configure the MPM list of the current block as list 3 (S660).
  • boundary values of the neighboring block may represent neighboring samples located near the upper side and the left side of the current block. That is, boundary values of the neighboring block may represent neighboring samples used for intra prediction of the current block.
  • the peripheral samples of the current block may include 2W upper peripheral samples, 2H left peripheral samples, and a left upper corner peripheral sample.
  • the left neighboring samples are p [-1] [0. ] To p [-1] [2H-1], the sample around the upper left corner is p [-1] [-1], and the sample around the upper side is p [0] [-1] to p [2W-1] [-1].
  • the encoding device / decoding device may derive the intra prediction mode of the current block based on the neighboring samples of the current block. For example, the encoding device / decoding device may determine whether a specific condition for the surrounding samples is satisfied, and if the specific condition for the surrounding samples is satisfied, explicit intra prediction mode information.
  • the intra prediction mode for the current block can be derived without performing intra prediction. That is, when a specific condition for the neighboring samples is satisfied, intra prediction mode information for the current block may not be signaled. Meanwhile, a method of deriving an intra prediction mode without the explicit intra prediction mode information may be referred to as implicit coding.
  • 8A and 8B illustrate an example of deriving an intra prediction mode of the current block based on neighboring samples of the current block in an encoding device / decoding device.
  • FIG. 8A illustrates an example of encoding information about an intra prediction mode of the current block based on neighboring samples of the current block in the encoding apparatus.
  • the encoding apparatus may determine whether values of neighboring samples of the current block satisfy a specific condition (S800). When values of neighboring samples of the current block satisfy a specific condition, the encoding apparatus may derive an intra prediction mode for the specific condition as an intra prediction mode of the current block.
  • S800 a specific condition
  • intra prediction modes may be classified into M subgroups, and when values of neighboring samples of the current block satisfy a specific condition, the encoding apparatus may include an intra prediction mode included in a specific subgroup for the specific condition. One of these may be determined as the intra prediction mode of the current block.
  • the encoding apparatus may generate an index indicating the selected intra prediction mode among the intra prediction modes included in the M subgroups. Through this, the index for the subgroup including a limited number of intra prediction modes in the subgroup may be signaled, and the index may be coded in a limited range of values to improve overall coding efficiency. For example, when the subgroup includes eight candidates, the index for the subgroup may have a value of 0 to 7, and the index may be coded with 3 bits. Therefore, the bit amount of the information indicating the intra prediction mode of the current block can be reduced, and coding efficiency can be improved.
  • the encoding apparatus may determine an intra prediction mode for the current block, and generate existing intra prediction mode information (S810).
  • the decoding apparatus may determine whether values of neighboring samples of the current block satisfy a specific condition (S820). If the values of the neighboring samples of the current block satisfy a specific condition, the decoding apparatus may derive an intra prediction mode for the specific condition as an intra prediction mode of the current block (S830).
  • intra prediction modes may be classified into M subgroups, and when values of neighboring samples of the current block satisfy a specific condition, the decoding apparatus may include an intra prediction mode included in a specific subgroup for the specific condition. An index indicating one of the above may be obtained, and an intra prediction mode of the current block may be determined based on the index. That is, the decoding apparatus may derive the intra prediction mode indicated by the index among the intra prediction modes included in the specific subgroup for the specific condition as the intra prediction mode of the current block.
  • the decoding apparatus may obtain existing intra prediction mode information (that is, explicit intra prediction mode information), and the intra prediction An intra prediction mode for the current block may be derived based on mode information in operation S840.
  • existing intra prediction mode information that is, explicit intra prediction mode information
  • FIG. 9 schematically illustrates an image encoding method by an encoding apparatus according to the present invention.
  • the method disclosed in FIG. 9 may be performed by the encoding apparatus disclosed in FIG. 1.
  • S900 to S920 of FIG. 9 may be performed by the prediction unit of the encoding apparatus
  • S930 may be performed by the entropy encoding unit of the encoding apparatus.
  • a process of deriving a residual sample for the current block based on an original sample and a prediction sample for the current block may be performed by a subtractor of the encoding apparatus.
  • the generating of the information about the residual on the current block may be performed by a converter of the encoding apparatus, and the encoding of the information about the residual may be performed by an entropy encoding unit of the encoding apparatus. It can be performed by.
  • the encoding apparatus configures a Most Probable Mode (MPM) list of the current block based on the neighboring blocks of the current block (S900).
  • MPM Most Probable Mode
  • the MPM list may include three MPM candidates, five MPM candidates, or six MPM candidates.
  • the encoding apparatus may construct the MPM list of the current block based on the neighboring block of the current block.
  • the neighboring block may include a left neighboring block and / or an upper neighboring block of the current block.
  • the encoding apparatus may derive an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block, and the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block have an intra prediction.
  • the mode can be determined.
  • the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block are the intra prediction modes having the vertical direction
  • the encoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the first order. have.
  • the encoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the left neighboring block as MPM candidates in N-th order other than the first order.
  • the intra prediction mode of the left neighboring block is the MPM candidate of the first order.
  • the encoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the upper neighboring block as MPM candidates in N-th order other than the first order.
  • the left neighboring block is (-1, H- 1) a block including a sample of coordinates
  • the upper peripheral block may be a block including a sample of (W-1, -1) coordinates.
  • the encoding apparatus may derive an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block, and determine whether the intra prediction mode of the upper neighboring block is an intra prediction mode having vertical direction. can do.
  • the encoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the first order.
  • the encoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the left neighboring block as MPM candidates in N-th order other than the first order.
  • the intra prediction mode of the left neighboring block may be derived as the MPM candidate of the first order.
  • the encoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the upper neighboring block as MPM candidates in N-th order other than the first order.
  • the encoding apparatus may construct the MPM list of the current block based on the neighboring block of the current block, wherein the neighboring block is a right upper neighboring block and / or a lower left margin of the current block. It may include a block.
  • the encoding apparatus may derive an intra prediction mode of the upper right neighboring block and an intra prediction mode of the lower left neighboring block, and the intra prediction mode of the right upper neighboring block and the intra prediction mode of the lower left neighboring block are vertical directional. It may be determined whether the intra prediction mode has a.
  • the encoding apparatus uses the intra prediction mode of the right upper neighboring block as the MPM candidate in the first order. Can be derived.
  • the encoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the N-th order other than the first order.
  • the intra prediction mode of the lower left neighboring block is performed in the first order.
  • the encoding apparatus may derive the intra prediction mode of the right upper neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the right upper neighbor block as the MPM candidates in the N-th order other than the first order.
  • the right upper peripheral block is (W, -1 )
  • the lower left peripheral block may be a block including a sample of (-1, H) coordinates.
  • the encoding apparatus may derive an intra prediction mode of the upper right neighboring block and an intra prediction mode of the lower left neighboring block, and the intra prediction mode of the right upper neighboring block has an intra prediction with vertical orientation.
  • the mode can be determined.
  • the encoding apparatus may derive the intra prediction mode of the right upper neighboring block as the MPM candidates in the first order.
  • the encoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the N-th order other than the first order.
  • the intra prediction mode of the lower left neighboring block may be derived as the MPM candidate in the first order.
  • the encoding apparatus may derive the intra prediction mode of the right upper neighboring block as the MPM candidates in the second order.
  • the encoding apparatus may derive the intra prediction mode of the right upper neighbor block as the MPM candidates in the N-th order other than the first order.
  • the encoding apparatus may construct an MPM list for the current block based on the size and / or type of the current block and the size and / or type of the neighboring block.
  • the peripheral block may include the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block, and / or the upper left peripheral block of the current block.
  • the type of block may be a square block or a non-square block.
  • the encoding apparatus may construct an MPM list for the current block based on N conditions for the size and type of the current block and the size and type of the neighboring block.
  • N may be one or more.
  • the encoding apparatus may determine whether the size of the current block, the type of the current block, the size of the neighboring block, and / or the type of the neighboring block correspond to a condition, and determine in order of the Nth condition in the first condition. Can be.
  • the MPM list may be configured as a list for the specific condition.
  • the list for the specific condition may include MPM candidates derived based on an intra prediction mode and a default intra prediction mode in a neighboring block of the current block in a specific order.
  • a condition for constructing the MPM list whether the current block is a non-square block, the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block and / or the upper left peripheral block Whether it is a non-square block, whether the size of the current block is greater than or equal to a specific size, the size of the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block and / or the upper left peripheral block It may include whether or not more than a specific size.
  • the encoding apparatus may first derive an intra prediction mode having horizontal directionality as an MPM candidate for the current block. That is, the encoding apparatus may derive the intra prediction mode having the horizontal directionality as the MPM candidates in the order before the intra prediction modes.
  • the encoding apparatus may preferentially derive an intra prediction mode having vertical orientation as an MPM candidate for the current block. That is, the encoding apparatus may derive the intra prediction mode having the vertical direction as the MPM candidates in the order before the intra prediction modes.
  • the current block may be a subblock derived by dividing the (partitioning) target block in the horizontal direction during the block partitioning process or a subblock derived by dividing the (partitioning) target block in the vertical direction.
  • the prediction may be performed in consideration of the characteristics of the current block, and the prediction accuracy may be improved.
  • the encoding apparatus may first derive an MPM candidate for the current block with an intra prediction mode having horizontal directionality as follows.
  • MPM [0] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • MPM [1] HOR_IDX (No. 18 horizontal intra prediction mode)
  • MPM [4] 65 (intra prediction mode 65)
  • MPM [5] VER_IDX (No. 50 vertical intra prediction mode)
  • the encoding apparatus may derive the intra prediction mode having the horizontal directionality as the MPM candidates in the order before the intra prediction modes.
  • the encoding apparatus may first derive the MPM candidate for the current block as follows, in the intra prediction mode having the vertical direction.
  • MPM [0] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • MPM [1] VER_IDX (No. 50 vertical intra prediction mode)
  • MPM [3] 60 (intra prediction mode 60)
  • MPM [4] 3 (intra prediction mode 3)
  • the encoding apparatus may derive the intra prediction mode having the vertical direction as the MPM candidates in the order before the intra prediction modes.
  • the encoding apparatus may derive the first N (eg, N equal to 3) MPM candidates based on the mode of the neighboring block, and for the remaining MPM candidates, the current block is larger than the height.
  • the MPM candidate for the current block may be derived as follows in the intra prediction mode having horizontal directionality as follows.
  • MPM [4] 5 (intra prediction mode 5)
  • MPM [5] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • the encoding apparatus may first derive the remaining MPM candidates for the current block with the intra prediction mode having the vertical direction as follows.
  • MPM [3] VER_IDX (No. 50 vertical intra prediction mode)
  • MPM [5] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • the encoding apparatus determines an intra prediction mode for the current block (S910).
  • the encoding apparatus may perform various intra prediction modes to derive an intra prediction mode having an optimal RD cost as an intra prediction mode for the current block.
  • the intra prediction mode may be one of two non-directional intra prediction modes and 65 intra directional prediction modes. As described above, the two non-directional intra prediction modes may include an intra DC mode and an intra planner mode.
  • the encoding apparatus may generate an MPM flag indicating whether the determined intra prediction mode is included in the MPM candidates of the MPM list.
  • an MPM index indicating the determined intra prediction mode among the MPM candidates may be generated.
  • the determined intra prediction mode is not included in the MPM candidates of the MPM list, generating remaining intra prediction mode information indicating the determined intra prediction mode among remaining intra prediction modes not included in the MPM candidates. can do.
  • the encoding apparatus may not signal the MPM flag, and the value of the MPM flag may be derived as 1.
  • the encoding apparatus may determine the intra prediction mode for the current block based on neighboring samples of the current block. In detail, the encoding apparatus may determine whether the sample values of the neighboring samples correspond to a specific condition. For example, the encoding apparatus may derive a representative value for neighboring samples of the current block, and determine whether the representative value is greater than a specific value.
  • the representative value may be an average value or a median value of the sample values of the peripheral samples.
  • the peripheral samples may include upper left corner samples, upper peripheral samples, and left peripheral samples of the current block.
  • the left neighboring samples are p [-1] [0. ] To p [-1] [2H-1], the sample around the upper left corner is p [-1] [-1], and the sample around the upper side is p [0] [-1] to p [2W-1] [-1].
  • the encoding apparatus may determine an intra prediction mode for the specific condition as an intra prediction mode for the current block. Or, for example, when the sample values of the neighboring samples correspond to a specific condition, the encoding apparatus may derive M intra prediction modes for the specific condition, and the current block of the M intra prediction modes. The intra prediction mode for may be determined. In this case, the encoding apparatus may generate an index indicating the determined intra prediction mode among the M intra prediction modes.
  • the encoding apparatus generates a prediction sample for the current block based on the intra prediction mode (S920).
  • the encoding apparatus may derive at least one neighboring sample of the neighboring samples of the current block based on the intra prediction mode, and generate the predictive sample based on the neighboring sample.
  • the peripheral samples may include upper left corner peripheral samples, upper peripheral samples, and left peripheral samples of the current block. For example, when the size of the current block is WxH and the x component of the top-left sample position of the current block is 0 and the y component is 0, the left neighboring samples are p [-1] [0. ] To p [-1] [2H-1], the sample around the upper left corner is p [-1] [-1], and the sample around the upper side is p [0] [-1] to p [2W-1] [-1].
  • the encoding device encodes intra prediction mode information on the current block (S930).
  • the encoding apparatus may encode the intra prediction mode information on the current block and output the bit stream in the form of a bitstream.
  • the intra prediction mode information may include the MPM flag, the MPM index and / or the remaining intra prediction mode information.
  • the encoding apparatus may generate an index indicating the determined intra prediction mode among the M intra prediction modes, and encode the index. Can be output in the form of a bitstream.
  • the bitstream may be transmitted to a decoding device through a network or a (digital) storage medium.
  • the network may include a broadcasting network and / or a communication network
  • the digital storage medium may include various storage media such as USB, SD, CD, DVD, Blu-ray, HDD, SSD, and the like.
  • FIG. 10 schematically illustrates an encoding apparatus for performing an image encoding method according to the present invention.
  • the method disclosed in FIG. 9 may be performed by the encoding apparatus disclosed in FIG. 10.
  • the prediction unit of the encoding apparatus of FIG. 10 may perform S900 to S920 of FIG. 9, and the entropy encoding unit of the encoding apparatus of FIG. 10 may perform S930 of FIG. 9.
  • a process of deriving a residual sample for the current block based on the original sample and the prediction sample for the current block may be performed by the subtraction unit of the encoding apparatus of FIG. 10.
  • the generating of the information about the residual for the current block based on the residual sample may be performed by the converter of the encoding apparatus of FIG. 10, and the encoding of the residual information may be performed in FIG. 10. May be performed by an entropy encoding unit of the encoding apparatus.
  • FIG. 11 schematically illustrates an image decoding method by a decoding apparatus according to the present invention.
  • the method disclosed in FIG. 11 may be performed by the decoding apparatus disclosed in FIG. 2.
  • S1100 to S1120 of FIG. 11 may be performed by the prediction unit of the decoding apparatus.
  • the process of acquiring intra prediction mode information on the current block through the bitstream and the process of acquiring information on the residual of the current block through the bitstream may include entropy decoding of the decoding apparatus.
  • the derivation of the residual sample for the current block based on the residual information may be performed by an inverse transform unit of the decoding apparatus, and the prediction sample and the residual sample
  • the process of generating a reconstructed picture based on may be performed by an adder of the decoding apparatus.
  • the decoding apparatus configures a Most Probable Mode (MPM) list of the current block based on the neighboring blocks of the current block (S1100).
  • MPM Most Probable Mode
  • the MPM list may include three MPM candidates, five MPM candidates, or six MPM candidates.
  • the decoding apparatus may configure the MPM list of the current block based on the neighboring block of the current block.
  • the neighboring block may include a left neighboring block and / or an upper neighboring block of the current block.
  • the decoding apparatus may derive an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block, and the intra prediction mode of the left neighboring block and the intra prediction mode of the upper neighboring block have an intra prediction.
  • the mode can be determined.
  • the decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the first order. have.
  • the decoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidates in the N-th order other than the first order.
  • the intra prediction mode of the left neighboring block is the MPM candidate of the first order.
  • the decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the N-th order other than the first order.
  • the left neighboring block is (-1, H- 1) a block including a sample of coordinates
  • the upper peripheral block may be a block including a sample of (W-1, -1) coordinates.
  • the decoding apparatus may derive an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block, and determine whether the intra prediction mode of the upper neighboring block is an intra prediction mode having vertical orientation. can do.
  • the decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the first order.
  • the decoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the left neighboring block as the MPM candidates in the N-th order other than the first order.
  • the intra prediction mode of the left neighboring block may be derived as the MPM candidate of the first order.
  • the decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the upper neighboring block as the MPM candidates in the N-th order other than the first order.
  • the decoding apparatus may construct the MPM list of the current block based on the neighboring block of the current block, wherein the neighboring block is a right upper neighboring block and / or a lower left margin of the current block. It may include a block.
  • the decoding apparatus may derive an intra prediction mode of the upper right neighboring block and an intra prediction mode of the lower left neighboring block, and the intra prediction mode of the right upper neighboring block and the intra prediction mode of the lower left neighboring block are vertical directional. It may be determined whether the intra prediction mode has a.
  • the decoding apparatus sets the intra prediction mode of the right upper neighboring block as the MPM candidate in the first order. Can be derived.
  • the decoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the N-th order other than the first order.
  • the intra prediction mode of the lower left neighboring block is performed in the first order.
  • the decoding apparatus may derive the intra prediction mode of the right upper neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the right upper neighbor block as the MPM candidates in the N-th order other than the first order.
  • the right upper peripheral block is (W, -1 )
  • the lower left peripheral block may be a block including a sample of (-1, H) coordinates.
  • the decoding apparatus may derive an intra prediction mode of the upper right neighboring block and an intra prediction mode of the lower left neighboring block, and the intra prediction mode of the right upper neighboring block has an intra prediction with vertical direction.
  • the mode can be determined.
  • the decoding apparatus may derive the intra prediction mode of the right upper neighboring block as the MPM candidates in the first order.
  • the decoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the N-th order other than the first order.
  • the decoding apparatus may derive the intra prediction mode of the lower left neighboring block as the MPM candidates in the first order.
  • the decoding apparatus may derive the intra prediction mode of the right upper neighboring block as the MPM candidates in the second order.
  • the decoding apparatus may derive the intra prediction mode of the right upper neighbor block as the MPM candidates in the N-th order other than the first order.
  • the decoding apparatus may construct an MPM list for the current block based on the size and / or type of the current block and the size and / or type of the neighboring block.
  • the peripheral block may include the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block, and / or the upper left peripheral block of the current block.
  • the type of block may be a square block or a non-square block.
  • the decoding apparatus may configure an MPM list for the current block based on N conditions for the size and type of the current block and the size and type of the neighboring block.
  • N may be one or more.
  • the decoding apparatus may determine whether the size of the current block, the type of the current block, the size of the neighboring block, and / or the type of the neighboring block correspond to a condition, and determine in order of the Nth condition in the first condition. Can be.
  • the MPM list may be configured as a list for the specific condition.
  • the list for the specific condition may include MPM candidates derived based on an intra prediction mode and a default intra prediction mode in a neighboring block of the current block in a specific order.
  • a condition for constructing the MPM list whether the current block is a non-square block, the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block and / or the upper left peripheral block Whether it is a non-square block, whether the size of the current block is greater than or equal to a specific size, the size of the left peripheral block, the upper peripheral block, the lower left peripheral block, the right upper peripheral block and / or the upper left peripheral block It may include whether or not more than a specific size.
  • the decoding apparatus may preferentially derive an intra prediction mode having horizontal directionality as an MPM candidate for the current block. That is, the decoding apparatus may derive the intra prediction mode having the horizontal directionality as the MPM candidates in the order before the intra prediction modes other than the intra prediction mode.
  • the decoding apparatus may preferentially derive an intra prediction mode having vertical orientation as an MPM candidate for the current block. That is, the decoding apparatus may derive the intra prediction mode having the vertical direction as the MPM candidates in the order before the intra prediction modes.
  • the current block may be a subblock derived by dividing the (partitioning) target block in the horizontal direction during the block partitioning process or a subblock derived by dividing the (partitioning) target block in the vertical direction.
  • the prediction may be performed in consideration of the characteristics of the current block, and the prediction accuracy may be improved.
  • the decoding apparatus may first derive an MPM candidate for the current block with an intra prediction mode having horizontal directionality as follows.
  • MPM [0] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • MPM [1] HOR_IDX (No. 18 horizontal intra prediction mode)
  • MPM [4] 65 (intra prediction mode 65)
  • MPM [5] VER_IDX (No. 50 vertical intra prediction mode)
  • the decoding apparatus may derive the intra prediction mode having the horizontal directionality as the MPM candidates in the order before the intra prediction modes other than the intra prediction mode.
  • the decoding apparatus may first derive an MPM candidate for the current block with an intra prediction mode having vertical orientation as follows.
  • MPM [0] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • MPM [1] VER_IDX (No. 50 vertical intra prediction mode)
  • MPM [3] 60 (intra prediction mode 60)
  • MPM [4] 3 (intra prediction mode 3)
  • the decoding apparatus may derive the intra prediction mode having the vertical direction as the MPM candidates in the order before the intra prediction modes.
  • the first N (eg, N equals 3) MPM candidates may be derived based on the mode of the neighboring block, and for the remaining MPM candidates, the current block is a non-square block whose width is greater than the height.
  • the MPM candidate for the current block may be derived as follows in the intra prediction mode having the horizontal directionality as follows.
  • MPM [4] 5 (intra prediction mode 5)
  • MPM [5] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • the decoding apparatus may first derive the remaining MPM candidates for the current block with the intra prediction mode having the vertical direction as follows.
  • MPM [3] VER_IDX (No. 50 vertical intra prediction mode)
  • MPM [5] PLANAR_IDX (Planner Intra Prediction Mode 0)
  • the decoding apparatus derives an intra prediction mode for the current block based on the MPM list (S1110).
  • the decoding apparatus may derive an MPM flag for the current block.
  • the decoding apparatus may obtain intra prediction mode information for the current block from the bitstream, and the intra prediction mode information may include an MPM flag for the current block.
  • the intra prediction mode information may not include the MPM flag, and in this case, the decoding apparatus may derive the value of the MPM flag as 1.
  • the decoding apparatus may derive the MPM candidate indicated by the MPM index among the MPM candidates of the MPM list in the intra prediction mode for the current block.
  • the intra prediction mode information may include the MPM index.
  • the MPM index may be signaled in the form of an mpm_idx or intra_luma_mpm_idx syntax element.
  • the decoding apparatus may derive the intra prediction mode indicated by the remaining intra prediction mode information among the remaining intra prediction modes as the intra prediction mode for the current block.
  • the remaining intra prediction modes may indicate remaining intra prediction modes not included in the MPM candidates of the MPM list.
  • the intra prediction mode information may include the remaining intra prediction mode information.
  • the remaining intra prediction mode information may be signaled in the form of rem_intra_luma_pred_mode or intra_luma_mpm_remainder syntax elements.
  • the decoding apparatus may derive the intra prediction mode for the current block based on the neighboring samples for the current block.
  • the decoding apparatus may determine whether sample values of the neighboring samples correspond to a specific condition.
  • the decoding apparatus may derive a representative value for neighboring samples of the current block, and determine whether the representative value is greater than a specific value.
  • the representative value may be an average value or a median value of the sample values of the peripheral samples.
  • the peripheral samples may include upper left corner samples, upper peripheral samples, and left peripheral samples of the current block.
  • the left neighboring samples are p [-1] [0. ] To p [-1] [2H-1], the sample around the upper left corner is p [-1] [-1], and the sample around the upper side is p [0] [-1] to p [2W-1] [-1].
  • the decoding apparatus may derive an intra prediction mode for the specific condition as an intra prediction mode for the current block.
  • the decoding apparatus may derive M intra prediction modes for the specific condition, and the received index among the M intra prediction modes.
  • the intra prediction mode indicated by may be derived as the intra prediction mode for the current block.
  • the index may be obtained through a bitstream, and the index may indicate one of the M intra prediction modes.
  • the decoding apparatus generates a prediction sample for the current block based on the intra prediction mode (S1120).
  • the decoding apparatus may derive at least one neighboring sample of the neighboring samples of the current block based on the intra prediction mode, and generate the predictive sample based on the neighboring sample.
  • the peripheral samples may include upper left corner peripheral samples, upper peripheral samples, and left peripheral samples of the current block. For example, when the size of the current block is WxH and the x component of the top-left sample position of the current block is 0 and the y component is 0, the left neighboring samples are p [-1] [0. ] To p [-1] [2H-1], the sample around the upper left corner is p [-1] [-1], and the sample around the upper side is p [0] [-1] to p [2W-1] [-1].
  • the decoding apparatus may directly use the prediction sample as a reconstruction sample according to a prediction mode, or generate a reconstruction sample by adding a residual sample to the prediction sample. If there is a residual sample for the current block, the decoding apparatus may receive information about the residual for the current block, and the information about the residual may be included in the information about the face. The information about the residual may include transform coefficients regarding the residual sample. The decoding apparatus may derive the residual sample (or residual sample array) for the current block based on the residual information. The decoding apparatus may generate a reconstructed sample based on the prediction sample and the residual sample, and may derive a reconstructed block or a reconstructed picture based on the reconstructed sample. Thereafter, as described above, the decoding apparatus may apply an in-loop filtering procedure, such as a deblocking filtering and / or SAO procedure, to the reconstructed picture in order to improve subjective / objective picture quality as necessary.
  • an in-loop filtering procedure such as a deblocking filtering and / or
  • FIG. 12 schematically illustrates a decoding apparatus for performing an image decoding method according to the present invention.
  • the method disclosed in FIG. 11 may be performed by the decoding apparatus disclosed in FIG. 12.
  • the prediction unit of the decoding apparatus of FIG. 12 may perform S1100 to S1120 of FIG. 11.
  • the process of obtaining the intra prediction mode information for the current block through the bitstream and the process of obtaining the information about the residual for the current block through the bitstream may be performed in the decoding apparatus of FIG. 12.
  • the derivation of the residual sample for the current block based on the residual information may be performed by an inverse transform unit of the decoding apparatus of FIG. 12.
  • a process of generating a reconstructed picture based on a sample and the residual sample may be performed by an adder of the decoding apparatus of FIG. 12.
  • the MPM list for the current block in consideration of the neighboring blocks of the current block, thereby reducing the amount of bits for indicating the intra prediction mode of the current block and improving the overall coding efficiency. You can.
  • the MPM list for the current block may be configured in consideration of the size and / or type of the current block and neighboring blocks, thereby reducing the amount of bits indicating the intra prediction mode of the current block. And improve the overall coding efficiency.
  • the present invention it is possible to derive the intra prediction mode of the current block based on the sample values of neighboring samples of the current block, thereby reducing the amount of bits to indicate the intra prediction mode of the current block and overall coding.
  • the efficiency can be improved.
  • the above-described method according to the present invention may be implemented in software, and the encoding device and / or the decoding device according to the present invention may perform image processing of, for example, a TV, a computer, a smartphone, a set-top box, a display device, and the like. It can be included in the device.
  • the above-described method may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device. That is, the embodiments described in the present invention may be implemented and performed on a processor, a microprocessor, a controller, or a chip. For example, the functional units shown in each drawing may be implemented and performed on a computer, processor, microprocessor, controller, or chip.
  • the decoding apparatus and encoding apparatus to which the present invention is applied include a multimedia broadcasting transmitting and receiving device, a mobile communication terminal, a home cinema video device, a digital cinema video device, a surveillance camera, a video chat device, a real time communication device such as video communication, and mobile streaming.
  • the OTT video device may include a game console, a Blu-ray player, an internet access TV, a home theater system, a smartphone, a tablet PC, a digital video recorder (DVR), and the like.
  • the processing method to which the present invention is applied can be produced in the form of a program executed by a computer, and can be stored in a computer-readable recording medium.
  • Multimedia data having a data structure according to the present invention can also be stored in a computer-readable recording medium.
  • the computer readable recording medium includes all kinds of storage devices and distributed storage devices in which computer readable data is stored.
  • the computer-readable recording medium may be, for example, a Blu-ray disc (BD), a universal serial bus (USB), a ROM, a PROM, an EPROM, an EEPROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, and an optical disc. It may include a data storage device.
  • the computer-readable recording medium also includes media embodied in the form of a carrier wave (eg, transmission over the Internet).
  • the bitstream generated by the encoding method may be stored in a computer-readable recording medium or transmitted through a wired or wireless communication network.
  • an embodiment of the present invention may be implemented as a computer program product by program code, which may be performed on a computer by an embodiment of the present invention.
  • the program code may be stored on a carrier readable by a computer.
  • the content streaming system to which the present invention is applied may largely include an encoding server, a streaming server, a web server, a media storage, a user device, and a multimedia input device.
  • the encoding server compresses content input from multimedia input devices such as a smart phone, a camera, a camcorder, etc. into digital data to generate a bitstream and transmit the bitstream to the streaming server.
  • multimedia input devices such as smart phones, cameras, camcorders, etc. directly generate a bitstream
  • the encoding server may be omitted.
  • the bitstream may be generated by an encoding method or a bitstream generation method to which the present invention is applied, and the streaming server may temporarily store the bitstream in the process of transmitting or receiving the bitstream.
  • the streaming server transmits the multimedia data to the user device based on the user's request through the web server, and the web server serves as a medium for informing the user of what service.
  • the web server delivers it to a streaming server, and the streaming server transmits multimedia data to the user.
  • the content streaming system may include a separate control server.
  • the control server plays a role of controlling a command / response between devices in the content streaming system.
  • the streaming server may receive content from a media store and / or an encoding server. For example, when the content is received from the encoding server, the content may be received in real time. In this case, in order to provide a smooth streaming service, the streaming server may store the bitstream for a predetermined time.
  • Examples of the user device include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, Tablet PCs, ultrabooks, wearable devices, such as smartwatches, glass glasses, head mounted displays, digital TVs, desktops Computer, digital signage, and the like.
  • PDA personal digital assistant
  • PMP portable multimedia player
  • navigation a slate PC
  • Tablet PCs tablet PCs
  • ultrabooks wearable devices, such as smartwatches, glass glasses, head mounted displays, digital TVs, desktops Computer, digital signage, and the like.
  • Each server in the content streaming system may be operated as a distributed server, in which case data received from each server may be distributed.

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Abstract

La présente invention concerne un procédé de décodage d'image exécuté par un appareil de décodage. Le procédé comprend les étapes consistant à : créer une liste de MPM d'un bloc actuel sur la base de blocs voisins du bloc actuel ; dériver un mode de prédiction intra pour le bloc actuel sur la base de la liste de MPM ; et générer un échantillon de prédiction pour le bloc actuel sur la base du mode de prédiction intra. Les blocs voisins comprennent un bloc voisin gauche et un bloc voisin supérieur du bloc courant, et si la taille du bloc courant est WxH et que la composante x d'une position d'échantillon supérieure gauche du bloc actuel est égale à 0 et que la composante y de celui-ci est égale à 0, le bloc voisin gauche inclut un échantillon de coordonnées (-1, H-1) et le bloc voisin supérieur inclut un échantillon de coordonnées (W-1, -1).
PCT/KR2019/003388 2018-04-02 2019-03-22 Procédé de codage d'image basé sur une liste de mpm dérivée de façon adaptative, et dispositif associé WO2019194441A1 (fr)

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