WO2020213867A1 - 스케일링 리스트 데이터의 시그널링 기반 비디오 또는 영상 코딩 - Google Patents
스케일링 리스트 데이터의 시그널링 기반 비디오 또는 영상 코딩 Download PDFInfo
- Publication number
- WO2020213867A1 WO2020213867A1 PCT/KR2020/004693 KR2020004693W WO2020213867A1 WO 2020213867 A1 WO2020213867 A1 WO 2020213867A1 KR 2020004693 W KR2020004693 W KR 2020004693W WO 2020213867 A1 WO2020213867 A1 WO 2020213867A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information
- aps
- scaling
- scaling list
- list data
- Prior art date
Links
Images
Classifications
-
- 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
- H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
-
- 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
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
-
- 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
- H04N19/124—Quantisation
-
- 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
- H04N19/124—Quantisation
- H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
-
- 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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/136—Incoming video signal characteristics or properties
- H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
-
- 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
-
- 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
- H04N19/174—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 slice, e.g. a line of blocks or a group of blocks
-
- 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
- H04N19/10—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
- H04N19/188—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 a video data packet, e.g. a network abstraction layer [NAL] unit
-
- 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
- H04N19/18—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 a set of transform coefficients
Definitions
- the present technology relates to video or video coding, and, for example, to a signaling based coding technology of scaling list data.
- VR Virtual Reality
- AR Artificial Realtiy
- high-efficiency video/video compression technology is required in order to effectively compress, transmit, store, and reproduce information of high-resolution, high-quality video/video having various characteristics as described above.
- the technical problem of this document is to provide a method and apparatus for increasing video/image coding efficiency.
- Another technical problem of this document is to provide a method and apparatus for increasing coding efficiency in a scaling process.
- Another technical problem of this document is to provide a method and apparatus for efficiently configuring a scaling list used in a scaling process.
- Another technical problem of this document is to provide a method and apparatus for hierarchically signaling information related to a scaling list used in a scaling process.
- Another technical problem of this document is to provide a method and apparatus for efficiently applying a scaling list-based scaling process.
- scaling list data may be signaled through an adaptation parameter set (APS), and APS referenced for scaling list data through header information (picture header/slice header/tile group header, etc.) APS identification information (APS ID) indicating the ID of may be signaled.
- APS adaptation parameter set
- type information of APS parameters may be signaled through APS, and whether a corresponding APS is scaling list data (scaling list parameters) APS may be indicated based on the type information of APS parameters. have.
- available flag information indicating whether scaling list data is available may be signaled hierarchically, and a lower level syntax (eg, based on available flag information signaled from a higher level syntax (eg, SPS)) For example, available flag information in a picture header/slice header/type group header, etc.) may be signaled.
- a lower level syntax eg, based on available flag information signaled from a higher level syntax (eg, SPS)
- restriction flag information may be signaled through the general restriction information syntax, and whether to use the available flag information of the scaling list data may be indicated based on the restriction flag information.
- information on the number of APS IDs indicating the number of IDs of APS related to scaling list data may be signaled through header information, and identification information syntax elements of APS related to scaling list data as much as the number of APS IDs are signaled. Can be.
- a video/video decoding method performed by a decoding apparatus is provided.
- the video/video decoding method may include the method disclosed in the embodiments of this document.
- a decoding apparatus for performing video/video decoding.
- the decoding apparatus may perform the method disclosed in the embodiments of this document.
- a video/video encoding method performed by an encoding device is provided.
- the video/video encoding method may include the method disclosed in the embodiments of this document.
- an encoding device that performs video/video encoding.
- the encoding device may perform the method disclosed in the embodiments of this document.
- a computer-readable digital storage medium in which encoded video/image information generated according to the video/image encoding method disclosed in at least one of the embodiments of the present document is stored is provided.
- encoded information causing to perform the video/image decoding method disclosed in at least one of the embodiments of the present document by a decoding device or a computer-readable digital storing encoded video/image information Provide a storage medium.
- This document can have various effects. For example, according to an embodiment of this document, it is possible to increase overall image/video compression efficiency. In addition, according to an embodiment of the present document, coding efficiency may be improved and subjective/objective visual quality may be improved by applying an efficient scaling process. In addition, according to an embodiment of the present document, a scaling list used in a scaling process can be efficiently configured, and information related to the scaling list can be hierarchically signaled through this. Also, according to an embodiment of the present document, coding efficiency may be increased by efficiently applying a scaling process based on a scaling list.
- FIG. 1 schematically shows an example of a video/image coding system that can be applied to embodiments of this document.
- FIG. 2 is a diagram schematically illustrating a configuration of a video/video encoding apparatus to which embodiments of the present document can be applied.
- FIG. 3 is a diagram schematically illustrating a configuration of a video/image decoding apparatus to which embodiments of the present document can be applied.
- FIG. 4 shows an example of a schematic video/video encoding method to which embodiments of this document are applicable.
- FIG. 5 shows an example of a schematic video/video decoding method to which embodiments of the present document are applicable.
- 6 exemplarily shows a hierarchical structure for a coded image/video.
- FIG. 7 is a flowchart schematically illustrating an example of a video/video encoding method according to the embodiment(s) of this document.
- FIG. 8 is a flowchart schematically illustrating an example of a video/video decoding method according to the embodiment(s) of this document.
- FIG 9 shows an example of a content streaming system to which embodiments disclosed in this document can be applied.
- each of the components in the drawings described in this document is independently illustrated for convenience of description of different characteristic functions, and does not mean that each component is implemented as separate hardware or separate software.
- two or more of the configurations 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 rights of this document, unless departing from the essence of this document.
- a or B may mean “only A”, “only B” or “both A and B”.
- a or B (A or B) may be interpreted as “A and/or B (A and/or B)”.
- A, B or C (A, B or C) means “only A”, “only B”, “only C”, or "any and all combinations of A, B and C ( It can mean any combination of A, B and C)”.
- a forward slash (/) or comma (comma) used in this document may mean “and/or”.
- A/B can mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”.
- A, B, C may mean "A, B or C”.
- At least one of A and B may mean “only A”, “only B”, or “both A and B”.
- the expression “at least one of A or B” or “at least one of A and/or B” means “at least one A and B (at least one of A and B)" can be interpreted the same.
- At least one of A, B and C means “only A”, “only B”, “only C", or "A, B and C May mean any combination of A, B and C”.
- at least one of A, B or C (at least one of A, B or C) or “at least one of A, B and/or C (at least one of A, B and/or C)” It can mean “at least one of A, B and C”.
- parentheses used in this document may mean “for example”. Specifically, when indicated as “prediction (intra prediction)", “intra prediction” may be proposed as an example of “prediction”. In other words, “prediction” in this document is not limited to “intra prediction”, and “intra prediction” may be suggested as an example of “prediction”. In addition, even when displayed as “prediction (ie, intra prediction)", “intra prediction” may be proposed as an example of "prediction”.
- This document is about video/image coding.
- the method/embodiment disclosed in this document may be applied to a method disclosed in the VVC (versatile video coding) standard.
- the method/embodiment disclosed in this document is an EVC (essential video coding) standard, AV1 (AOMedia Video 1) standard, AVS2 (2nd generation of audio video coding standard), or next-generation video/image coding standard (ex. H.267). or H.268, etc.).
- a video may mean a set of a series of images over time.
- a picture generally refers to a unit representing one image in a specific time period, and a slice/tile is a unit constituting a part of a picture in coding.
- a slice/tile may include one or more coding tree units (CTU).
- CTU coding tree units
- One picture may be composed of one or more slices/tiles.
- a tile is a rectangular region of CTUs within a particular tile column and a particular tile row in a picture.
- the tile column is a rectangular region of CTUs, the rectangular region has a height equal to the height of the picture, and the width may be specified by syntax elements in a picture parameter set (The tile column is a rectangular region of CTUs having a height equal to the height of the picture and a width specified by syntax elements in the picture parameter set).
- the tile row is a rectangular region of CTUs, the rectangular region has a width specified by syntax elements in a picture parameter set, and a height may be the same as the height of the picture (The tile row is a rectangular region of CTUs having a height specified by syntax elements in the picture parameter set and a width equal to the width of the picture).
- a tile scan may represent a specific sequential ordering of CTUs that partition a picture, the CTUs may be sequentially arranged in a CTU raster scan in a tile, and tiles in a picture may be sequentially arranged in a raster scan of the tiles of the picture.
- a tile scan is a specific sequential ordering of CTUs partitioning a picture in which the CTUs are ordered consecutively in CTU raster scan in a tile whereas tiles in a picture are ordered consecutively in a raster scan of the tiles of the picture).
- a slice may include an integer number of complete tiles, which may be contained exclusively in a single NAL unit, or an integer number of consecutive complete CTU rows in a tile of a picture (A slice includes an integer number of complete tiles or an integer number of consecutive tiles). complete CTU rows within a tile of a picture that may be exclusively contained in a single NAL unit).
- one picture may be divided into two or more subpictures.
- the subpicture may be an rectangular region of one or more slices within a picture.
- a pixel or pel may mean a minimum unit constituting one picture (or image).
- sample' may be used as a term corresponding to a pixel.
- a sample may generally represent a pixel or a value of a pixel, may represent only a pixel/pixel value of a luma component, or may represent only a pixel/pixel value of a chroma component.
- the sample may mean a pixel value in the spatial domain, and when such a pixel value is converted to the frequency domain, it may mean a transform coefficient in the frequency domain.
- a unit may represent a basic unit of image processing.
- the unit may include at least one of a specific area of a picture and information related to the corresponding area.
- One unit may include one luma block and two chroma (ex. cb, cr) blocks.
- the unit may be used interchangeably with terms such as a block or an area depending on the case.
- the MxN block may include samples (or sample arrays) consisting of M columns and N rows, or a set (or array) of transform coefficients.
- quantization/inverse quantization and/or transform/inverse transform may be omitted in this document.
- the quantized transform coefficient may be referred to as a transform coefficient.
- the transform coefficient may be called a coefficient or a residual coefficient, or may still be called a transform coefficient for uniformity of expression.
- the quantized transform coefficient and the transform coefficient may be referred to as a transform coefficient and a scaled transform coefficient, respectively.
- the residual information may include information about the transform coefficient(s), and the information about the transform coefficient(s) may be signaled through the residual coding syntax.
- Transform coefficients may be derived based on residual information (or information about the transform coefficient(s)), and scaled transform coefficients may be derived through an inverse transform (scaling) of the transform coefficients. Residual samples may be derived based on the inverse transform (transform) of the scaled transform coefficients. This may be applied/expressed in other parts of this document as well.
- FIG. 1 schematically shows an example of a video/image coding system that can be applied to embodiments of this document.
- a video/image coding system may include a first device (a source device) and a second device (a receiving device).
- the source device may transmit the encoded video/image information or data in a file or streaming form to the receiving device through a digital storage medium or a network.
- the source device may include a video source, an encoding device, and a transmission unit.
- the receiving device may include a receiving unit, a decoding device, and a renderer.
- the encoding device may be referred to as a video/image encoding device, and the decoding device may be referred to as a video/image decoding device.
- the transmitter may be included in the encoding device.
- the receiver may be included in the decoding device.
- the renderer may include a display unit, and the display unit may be configured as a separate device or an external component.
- the video source may acquire a video/image through a process of capturing, synthesizing, or generating a video/image.
- the video source may include a video/image capturing device and/or a video/image generating device.
- the video/image capture device may include, for example, one or more cameras, a video/image archive including previously captured video/images, and the like.
- the video/image generating device may include, for example, a computer, a tablet and a smartphone, and may (electronically) generate a video/image.
- a virtual video/image may be generated through a computer or the like, and in this case, a video/image capturing process may be substituted as a process of generating related data.
- the encoding device may encode the input video/video.
- the encoding apparatus may perform a series of procedures such as prediction, transformation, and quantization for compression and coding efficiency.
- the encoded data (encoded video/video information) may be output in the form of a bitstream.
- the transmission unit may transmit the encoded video/video information or data output in the form of a bitstream to the reception unit of the receiving device through a digital storage medium or a network in a file or streaming form.
- Digital storage media may include various storage media such as USB, SD, CD, DVD, Blu-ray, HDD, and SSD.
- the transmission unit may include an element for generating a media file through a predetermined file format, and may include an element for transmission through a broadcast/communication network.
- the receiver may receive/extract the bitstream and transmit it to the decoding device.
- the decoding device may decode the video/image by performing a series of procedures such as inverse quantization, inverse transformation, and prediction corresponding to the operation of the encoding device.
- the renderer can render the decoded video/video.
- the rendered video/image may be displayed through the display unit.
- the encoding device may include an image encoding device and/or a video encoding device.
- the encoding device 200 includes an image partitioner 210, a predictor 220, a residual processor 230, an entropy encoder 240, and It may be configured to include an adder 250, a filter 260, and a memory 270.
- the prediction unit 220 may include an inter prediction unit 221 and an intra prediction unit 222.
- the residual processing unit 230 may include a transform unit 232, a quantizer 233, an inverse quantizer 234, and an inverse transformer 235.
- the residual processing unit 230 may further include a subtractor 231.
- the addition unit 250 may be referred to as a reconstructor or a recontructged block generator.
- the image segmentation unit 210, the prediction unit 220, the residual processing unit 230, the entropy encoding unit 240, the addition unit 250, and the filtering unit 260 described above may include one or more hardware components (for example, it may be configured by an encoder chipset or a processor).
- the memory 270 may include a decoded picture buffer (DPB), and may be configured by a digital storage medium.
- the hardware component may further include the memory 270 as an internal/external component.
- the image segmentation unit 210 may divide an input image (or picture, frame) input to the encoding apparatus 200 into one or more processing units.
- the processing unit may be referred to as a coding unit (CU).
- the coding unit is recursively divided according to the QTBTTT (Quad-tree binary-tree ternary-tree) structure from a coding tree unit (CTU) or a largest coding unit (LCU).
- QTBTTT Quad-tree binary-tree ternary-tree
- CTU coding tree unit
- LCU largest coding unit
- one coding unit may be divided into a plurality of coding units of a deeper depth based on a quad tree structure, a binary tree structure, and/or a ternary structure.
- a quad tree structure may be applied first, and a binary tree structure and/or a ternary structure may be applied later.
- the binary tree structure may be applied first.
- the coding procedure according to this document may be performed based on the final coding unit that is no longer divided. In this case, based on the coding efficiency according to the image characteristics, the maximum coding unit can be directly used as the final coding unit, or if necessary, the coding unit is recursively divided into coding units of lower depth to be optimal. A coding unit of the size of may be used as the final coding unit.
- the coding procedure may include a procedure such as prediction, transformation, and restoration described later.
- the processing unit may further include a prediction unit (PU) or a transform unit (TU).
- the prediction unit and the transform unit may be divided or partitioned from the above-described final coding unit, respectively.
- the prediction unit may be a unit of sample prediction
- the transform unit may be a unit for inducing a transform coefficient and/or a unit for inducing a residual signal from the transform coefficient.
- the unit may be used interchangeably with terms such as a block or an area depending on the case.
- the MxN block may represent a set of samples or transform coefficients consisting of M columns and N rows.
- a sample may represent a pixel or a value of a pixel, may represent only a pixel/pixel value of a luminance component, or may represent only a pixel/pixel value of a saturation component.
- a sample may be used as a term corresponding to one picture (or image) as a pixel or pel.
- the encoding apparatus 200 subtracts the prediction signal (predicted block, prediction sample array) output from the inter prediction unit 221 or the intra prediction unit 222 from the input video signal (original block, original sample array) to make a residual.
- a signal residual signal, residual block, residual sample array
- a unit that subtracts the prediction signal (prediction block, prediction sample array) from the input image signal (original block, original sample array) in the encoder 200 may be referred to as a subtraction unit 231.
- the prediction unit may perform prediction on a block to be processed (hereinafter, referred to as a current block) and generate a predicted block including prediction samples for the current block.
- the prediction unit may determine whether intra prediction or inter prediction is applied in units of the current block or CU.
- the prediction unit may generate various information related to prediction, such as prediction mode information, as described later in the description of each prediction mode, and transmit it to the entropy encoding unit 240.
- the information on prediction may be encoded by the entropy encoding unit 240 and output in the form of a bitstream.
- the intra prediction unit 222 may predict the current block by referring to samples in the current picture.
- the referenced samples may be located in the vicinity of the current block or may be located apart according to the prediction mode.
- prediction modes may include a plurality of non-directional modes and a plurality of directional modes.
- the non-directional mode may include, for example, a DC mode and a planar mode (Planar mode).
- the directional mode may include, for example, 33 directional prediction modes or 65 directional prediction modes according to a detailed degree of the prediction direction. However, this is an example, and more or less directional prediction modes may be used depending on the setting.
- the intra prediction unit 222 may determine a prediction mode applied to the current block by using the prediction mode applied to the neighboring block.
- the inter prediction unit 221 may derive a predicted block for the current block based on a reference block (reference sample array) specified by a motion vector on the reference picture.
- motion information may be predicted in units of blocks, subblocks, or samples based on a correlation between motion information between a neighboring block and a current block.
- the motion information may include a motion vector and a reference picture index.
- the motion information may further include inter prediction direction (L0 prediction, L1 prediction, Bi prediction, etc.) information.
- the neighboring block may include a spatial neighboring block existing in the current picture and a temporal neighboring block existing in the reference picture.
- the reference picture including the reference block and the reference picture including the temporal neighboring block may be the same or different.
- the temporal neighboring block may be called a collocated reference block, a co-located CU (colCU), and the like, and a reference picture including the temporal neighboring block may be referred to as a collocated picture (colPic).
- the inter prediction unit 221 constructs a motion information candidate list based on neighboring blocks, and provides information indicating which candidate is used to derive a motion vector and/or a reference picture index of the current block. Can be generated. Inter prediction may be performed based on various prediction modes.
- the inter prediction unit 221 may use motion information of a neighboring block as motion information of a current block.
- a residual signal may not be transmitted.
- MVP motion vector prediction
- the motion vector of the current block is calculated by using the motion vector of the neighboring block as a motion vector predictor and signaling a motion vector difference. I can instruct.
- the prediction unit 220 may generate a prediction signal based on various prediction methods to be described later.
- the prediction unit may apply intra prediction or inter prediction for prediction of one block, as well as simultaneously apply intra prediction and inter prediction. This can be called combined inter and intra prediction (CIIP).
- the prediction unit may be based on an intra block copy (IBC) prediction mode or a palette mode to predict a block.
- IBC intra block copy
- the IBC prediction mode or the palette mode may be used for content image/video coding such as a game, for example, screen content coding (SCC).
- SCC screen content coding
- IBC basically performs prediction in the current picture, but can be performed similarly to inter prediction in that it derives a reference block in the current picture. That is, the IBC may use at least one of the inter prediction techniques described in this document.
- the palette mode can be viewed as an example of intra coding or intra prediction. When the palette mode is applied, a sample value in a picture may be signaled based on information about a palette table and
- the prediction signal generated through the prediction unit may be used to generate a reconstructed signal or may be used to generate a residual signal.
- the transform unit 232 may generate transform coefficients by applying a transform technique to the residual signal.
- the transformation technique is DCT (Discrete Cosine Transform), DST (Discrete Sine Transform), KLT ( ), GBT (Graph-Based Transform), or CNT (Conditionally Non-linear Transform) may include at least one.
- GBT refers to the transformation obtained from this graph when the relationship information between pixels is expressed in a graph.
- CNT refers to a transformation obtained based on generating a prediction signal using all previously reconstructed pixels.
- the conversion process may be applied to a pixel block having the same size of a square, or may be applied to a block having a variable size other than a square.
- the quantization unit 233 quantizes the transform coefficients and transmits it to the entropy encoding unit 240, and the entropy encoding unit 240 encodes the quantized signal (information on quantized transform coefficients) and outputs it as a bitstream. have.
- the information on the quantized transform coefficients may be called residual information.
- the quantization unit 233 may rearrange the quantized transform coefficients in the form of blocks into a one-dimensional vector form based on a coefficient scan order, and the quantized transform coefficients in the form of the one-dimensional vector It is also possible to generate information about transform coefficients.
- the entropy encoding unit 240 may perform various encoding methods such as exponential Golomb, context-adaptive variable length coding (CAVLC), and context-adaptive binary arithmetic coding (CABAC).
- the entropy encoding unit 240 may encode together or separately information necessary for video/image reconstruction (eg, values of syntax elements) in addition to quantized transform coefficients.
- the encoded information (eg, encoded video/video information) may be transmitted or stored in a bitstream format in units of network abstraction layer (NAL) units.
- the video/video information may further include information on various parameter sets, such as an adaptation parameter set (APS), a picture parameter set (PPS), a sequence parameter set (SPS), or a video parameter set (VPS).
- the video/video information may further include general constraint information.
- information and/or syntax elements transmitted/signaled from the encoding device to the decoding device may be included in the video/video information.
- the video/video information may be encoded through the above-described encoding procedure and included in the bitstream.
- the bitstream may be transmitted through a network or may be stored in 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, and SSD.
- a transmission unit for transmitting and/or a storage unit (not shown) for storing may be configured as an internal/external element of the encoding apparatus 200, or the transmission unit It may be included in the entropy encoding unit 240.
- the quantized transform coefficients output from the quantization unit 233 may be used to generate a prediction signal.
- a residual signal residual block or residual samples
- the addition unit 155 adds the reconstructed residual signal to the prediction signal output from the inter prediction unit 221 or the intra prediction unit 222 to obtain a reconstructed signal (restored picture, reconstructed block, reconstructed sample array). Can be created.
- the predicted block may be used as a reconstructed block.
- the addition unit 250 may be referred to as a restoration unit or a restoration block generation unit.
- the generated reconstructed signal may be used for intra prediction of the next processing target block in the current picture, and may be used for inter prediction of the next picture through filtering as described later.
- LMCS luma mapping with chroma scaling
- the filtering unit 260 may improve subjective/objective image quality by applying filtering to the reconstructed signal.
- the filtering unit 260 may apply various filtering methods to the reconstructed picture to generate a modified reconstructed picture, and the modified reconstructed picture may be converted to the memory 270, specifically, the DPB of the memory 270. Can be saved on.
- the various filtering methods may include, for example, deblocking filtering, sample adaptive offset, adaptive loop filter, bilateral filter, and the like.
- the filtering unit 260 may generate a variety of filtering information and transmit it to the entropy encoding unit 240 as described later in the description of each filtering method.
- the filtering information may be encoded by the entropy encoding unit 240 and output in the form of a bitstream.
- the modified reconstructed picture transmitted to the memory 270 may be used as a reference picture in the inter prediction unit 221.
- the encoding device may avoid prediction mismatch between the encoding device 100 and the decoding device, and may improve encoding efficiency.
- the memory 270 DPB may store the modified reconstructed picture for use as a reference picture in the inter prediction unit 221.
- the memory 270 may store motion information of a block from which motion information in a current picture is derived (or encoded) and/or motion information of blocks in a picture that have already been reconstructed.
- the stored motion information may be transferred to the inter prediction unit 221 in order to be used as motion information of spatial neighboring blocks or motion information of temporal neighboring blocks.
- the memory 270 may store reconstructed samples of reconstructed blocks in the current picture, and may be transmitted to the intra prediction unit 222.
- the decoding device may include an image decoding device and/or a video decoding device.
- the decoding apparatus 300 includes an entropy decoder 310, a residual processor 320, a predictor 330, an adder 340, and a filtering unit. It may be configured to include (filter, 350) and memory (memoery) 360.
- the prediction unit 330 may include an inter prediction unit 331 and an intra prediction unit 332.
- the residual processing unit 320 may include a dequantizer 321 and an inverse transformer 321.
- the entropy decoding unit 310, the residual processing unit 320, the prediction unit 330, the addition unit 340, and the filtering unit 350 described above are one hardware component (for example, a decoder chipset or a processor). ) Can be configured.
- the memory 360 may include a decoded picture buffer (DPB), and may be configured by a digital storage medium.
- the hardware component may further include the memory 360 as an internal/external component.
- the decoding apparatus 300 may reconstruct an image in response to a process in which the video/image information is processed by the encoding apparatus of FIG. 2. For example, the decoding apparatus 300 may derive units/blocks based on block division related information obtained from the bitstream.
- the decoding device 300 may perform decoding using a processing unit applied in the encoding device.
- the processing unit of decoding may be, for example, a coding unit, and the coding unit may be divided from a coding tree unit or a maximum coding unit along a quad tree structure, a binary tree structure and/or a ternary tree structure.
- One or more transform units may be derived from the coding unit.
- the reconstructed image signal decoded and output through the decoding device 300 may be reproduced through the playback device.
- the decoding apparatus 300 may receive a signal output from the encoding apparatus of FIG. 2 in the form of a bitstream, and the received signal may be decoded through the entropy decoding unit 310.
- the entropy decoding unit 310 may parse the bitstream to derive information (eg, video/video information) necessary for image restoration (or picture restoration).
- the video/video information may further include information on various parameter sets, such as an adaptation parameter set (APS), a picture parameter set (PPS), a sequence parameter set (SPS), or a video parameter set (VPS).
- the video/video information may further include general constraint information.
- the decoding apparatus may further decode the picture based on the information on the parameter set and/or the general restriction information.
- Signaled/received information and/or syntax elements described later in this document may be decoded through the decoding procedure and obtained from the bitstream.
- the entropy decoding unit 310 decodes information in the bitstream based on a coding method such as exponential Golomb coding, CAVLC, or CABAC, and a value of a syntax element required for image restoration, a quantized value of a transform coefficient related to a residual. Can be printed.
- the CABAC entropy decoding method receives a bin corresponding to each syntax element in a bitstream, and includes information on a syntax element to be decoded and information on a neighboring and decoding target block or information on a symbol/bin decoded in a previous step.
- a context model is determined using the context model, and a symbol corresponding to the value of each syntax element can be generated by performing arithmetic decoding of the bin by predicting the probability of occurrence of a bin according to the determined context model.
- the CABAC entropy decoding method may update the context model using information of the decoded symbol/bin for the context model of the next symbol/bin after the context model is determined.
- information about prediction is provided to a prediction unit (inter prediction unit 332 and intra prediction unit 331), and entropy decoding is performed by the entropy decoding unit 310.
- the dual value that is, quantized transform coefficients and related parameter information may be input to the residual processing unit 320.
- the residual processing unit 320 may derive a residual signal (a residual block, residual samples, and a residual sample array).
- information about filtering among information decoded by the entropy decoding unit 310 may be provided to the filtering unit 350.
- a receiver (not shown) for receiving a signal output from the encoding device may be further configured as an inner/outer element of the decoding device 300, or the receiver may be a component of the entropy decoding unit 310.
- the decoding apparatus may be called a video/video/picture decoding apparatus, and the decoding apparatus can be divided into an information decoder (video/video/picture information decoder) and a sample decoder (video/video/picture sample decoder). May be.
- the information decoder may include the entropy decoding unit 310, and the sample decoder includes the inverse quantization unit 321, an inverse transform unit 322, an addition unit 340, a filtering unit 350, and a memory 360. ), an inter prediction unit 332 and an intra prediction unit 331 may be included.
- the inverse quantization unit 321 may inverse quantize the quantized transform coefficients and output transform coefficients.
- the inverse quantization unit 321 may rearrange the quantized transform coefficients in a two-dimensional block shape. In this case, the rearrangement may be performed based on the coefficient scan order performed by the encoding device.
- the inverse quantization unit 321 may perform inverse quantization on quantized transform coefficients by using a quantization parameter (for example, quantization step size information) and obtain transform coefficients.
- a quantization parameter for example, quantization step size information
- the inverse transform unit 322 obtains a residual signal (residual block, residual sample array) by inverse transforming the transform coefficients.
- the prediction unit may perform prediction on the current block and generate a predicted block including prediction samples for the current block.
- the prediction unit may determine whether intra prediction or inter prediction is applied to the current block based on the information about the prediction output from the entropy decoding unit 310, and may determine a specific intra/inter prediction mode.
- the prediction unit 320 may generate a prediction signal based on various prediction methods to be described later.
- the prediction unit may apply intra prediction or inter prediction for prediction of one block, as well as simultaneously apply intra prediction and inter prediction. This can be called combined inter and intra prediction (CIIP).
- the prediction unit may be based on an intra block copy (IBC) prediction mode or a palette mode to predict a block.
- IBC intra block copy
- the IBC prediction mode or the palette mode may be used for content image/video coding such as a game, for example, screen content coding (SCC).
- SCC screen content coding
- IBC basically performs prediction in the current picture, but can be performed similarly to inter prediction in that it derives a reference block in the current picture. That is, the IBC may use at least one of the inter prediction techniques described in this document.
- the palette mode can be viewed as an example of intra coding or intra prediction. When the palette mode is applied, information about a palette table and a palette index may be included in the video/video information and signale
- the intra prediction unit 331 may predict the current block by referring to samples in the current picture.
- the referenced samples may be located in the vicinity of the current block or may be located apart according to the prediction mode.
- prediction modes may include a plurality of non-directional modes and a plurality of directional modes.
- the intra prediction unit 331 may determine a prediction mode applied to the current block by using the prediction mode applied to the neighboring block.
- the inter prediction unit 332 may derive a predicted block for the current block based on a reference block (reference sample array) specified by a motion vector on the reference picture.
- motion information may be predicted in units of blocks, subblocks, or samples based on a correlation between motion information between a neighboring block and a current block.
- the motion information may include a motion vector and a reference picture index.
- the motion information may further include inter prediction direction (L0 prediction, L1 prediction, Bi prediction, etc.) information.
- the neighboring block may include a spatial neighboring block existing in the current picture and a temporal neighboring block existing in the reference picture.
- the inter prediction unit 332 may construct a motion information candidate list based on neighboring blocks, and derive a motion vector and/or a reference picture index of the current block based on the received candidate selection information.
- Inter prediction may be performed based on various prediction modes, and the information about the prediction may include information indicating a mode of inter prediction for the current block.
- the addition unit 340 is reconstructed by adding the obtained residual signal to the prediction signal (predicted block, prediction sample array) output from the prediction unit (including the inter prediction unit 332 and/or the intra prediction unit 331). Signals (restored pictures, reconstructed blocks, reconstructed sample arrays) can be generated. When there is no residual for a block to be processed, such as when the skip mode is applied, the predicted block may be used as a reconstructed block.
- the addition unit 340 may be referred to as a restoration unit or a restoration block generation unit.
- the generated reconstructed signal may be used for intra prediction of the next processing target block in the current picture, may be output through filtering as described later, or may be used for inter prediction of the next picture.
- LMCS luma mapping with chroma scaling
- the filtering unit 350 may improve subjective/objective image quality by applying filtering to the reconstructed signal.
- the filtering unit 350 may generate a modified reconstructed picture by applying various filtering methods to the reconstructed picture, and the modified reconstructed picture may be converted to the memory 360, specifically, the DPB of the memory 360. Can be transferred to.
- the various filtering methods may include, for example, deblocking filtering, sample adaptive offset, adaptive loop filter, bilateral filter, and the like.
- the (modified) reconstructed picture stored in the DPB of the memory 360 may be used as a reference picture in the inter prediction unit 332.
- the memory 360 may store motion information of a block from which motion information in a current picture is derived (or decoded) and/or motion information of blocks in a picture that have already been reconstructed.
- the stored motion information may be transmitted to the inter prediction unit 332 in order to be used as motion information of spatial neighboring blocks or motion information of temporal neighboring blocks.
- the memory 360 may store reconstructed samples of reconstructed blocks in the current picture, and may be transmitted to the intra prediction unit 331.
- the embodiments described in the filtering unit 260, the inter prediction unit 221, and the intra prediction unit 222 of the encoding apparatus 200 are respectively the filtering unit 350 and the inter prediction of the decoding apparatus 300.
- the same or corresponding to the unit 332 and the intra prediction unit 331 may be applied.
- a predicted block including prediction samples for a current block as a coding target block may be generated.
- the predicted block includes prediction samples in the spatial domain (or pixel domain).
- the predicted block is derived equally from the encoding device and the decoding device, and the encoding device signals information about the residual between the original block and the predicted block (residual information), not the original sample value of the original block, to the decoding device.
- Image coding efficiency can be improved.
- the decoding apparatus may derive a residual block including residual samples based on the residual information, generate a reconstructed block including reconstructed samples by adding the residual block and the predicted block, and reconstruct including the reconstructed blocks You can create a picture.
- the residual information may be generated through transformation and quantization procedures.
- the encoding apparatus derives a residual block between an original block and a predicted block, performs a transformation procedure on residual samples (residual sample array) included in the residual block to derive transform coefficients, and transforms
- residual samples residual sample array
- transforms By performing a quantization procedure on the coefficients, quantized transform coefficients may be derived, and related residual information may be signaled to a decoding apparatus (through a bitstream).
- the residual information may include information such as value information of quantized transform coefficients, position information, a transform technique, a transform kernel, and a quantization parameter.
- the decoding apparatus may perform an inverse quantization/inverse transform procedure based on the residual information and derive residual samples (or residual blocks).
- the decoding apparatus may generate a reconstructed picture based on the predicted block and the residual block.
- the encoding apparatus may also inverse quantize/inverse transform quantized transform coefficients for reference for inter prediction of a picture to derive a residual block, and generate a reconstructed picture based on this.
- Intra prediction may indicate prediction of generating prediction samples for a current block based on reference samples in a picture (hereinafter, referred to as a current picture) to which the current block belongs.
- a current picture a picture to which the current block belongs.
- surrounding reference samples to be used for intra prediction of the current block may be derived.
- the neighboring reference samples of the current block are a sample adjacent to the left boundary of the current block of size nWxnH and a total of 2xnH samples adjacent to the bottom-left, a sample adjacent to the top boundary of the current block, and A total of 2xnW samples adjacent to the top-right side and one sample adjacent to the top-left side of the current block may be included.
- the peripheral reference samples of the current block may include a plurality of columns of upper peripheral samples and a plurality of rows of left peripheral samples.
- the neighboring reference samples of the current block are a total of nH samples adjacent to the right boundary of the current block of size nWxnH, a total of nW samples adjacent to the bottom boundary of the current block, and the lower right ( It may include one sample adjacent to the bottom-right).
- the decoder may construct neighboring reference samples to be used for prediction by substituting samples that are not available with available samples.
- surrounding reference samples to be used for prediction may be configured through interpolation of available samples.
- a prediction sample can be derived based on an average or interpolation of neighboring reference samples of the current block, and (ii) neighboring reference samples of the current block Among them, a prediction sample may be derived based on a reference sample existing in a specific (prediction) direction with respect to the prediction sample.
- the case of (i) may be referred to as a non-directional mode or a non-angular mode, and the case of (ii) may be referred to as a directional mode or an angular mode.
- a prediction sample may be generated.
- LIP linear interpolation intra prediction
- chroma prediction samples may be generated based on luma samples using a linear model (LM). This case may be referred to as an LM mode or a chroma component LM (CCLM) mode.
- a temporary prediction sample of the current block is derived based on the filtered surrounding reference samples, and at least one reference sample derived according to the intra prediction mode among the existing surrounding reference samples, that is, unfiltered surrounding reference samples.
- the prediction samples of the current block may be derived by weighted sum of and temporary prediction samples. The above case may be referred to as PDPC (Position dependent intra prediction).
- a reference sample line with the highest prediction accuracy is selected from the neighboring multi-reference sample lines of the current block, and a prediction sample is derived from the reference sample located in the prediction direction, and at this time, the used reference sample line is decoded.
- Intra prediction coding may be performed by indicating (signaling) to. The above-described case may be referred to as multi-reference line intra prediction or MRL-based intra prediction.
- the current block is divided into vertical or horizontal subpartitions, and intra prediction is performed based on the same intra prediction mode, but neighboring reference samples may be derived and used in units of subpartitions. That is, in this case, the intra prediction mode for the current block is equally applied to the subpartitions, but by deriving and using neighboring reference samples in units of subpartitions, intra prediction performance may be improved in some cases.
- This prediction method may be referred to as intra-prediction based on ISP (intra sub-partitions).
- the above-described intra prediction methods may be referred to as an intra prediction type in distinction from the intra prediction mode.
- the intra prediction type may be referred to in various terms such as an intra prediction technique or an additional intra prediction mode.
- the intra prediction type (or additional intra prediction mode, etc.) may include at least one of the aforementioned LIP, PDPC, MRL, and ISP.
- a general intra prediction method excluding specific intra prediction types such as LIP, PDPC, MRL, and ISP may be referred to as a normal intra prediction type.
- the normal intra prediction type may be generally applied when the specific intra prediction type as described above is not applied, and prediction may be performed based on the aforementioned intra prediction mode. Meanwhile, post-processing filtering may be performed on the derived prediction samples as necessary.
- the intra prediction procedure may include determining an intra prediction mode/type, deriving a neighboring reference sample, and deriving an intra prediction mode/type based prediction sample. Also, a post-filtering step may be performed on the derived prediction samples as necessary.
- an intra prediction mode applied to the current block may be determined using an intra prediction mode of a neighboring block.
- the decoding apparatus receives one of the MPM candidates in the most probable mode (MPM) list derived based on the intra prediction mode of the neighboring block (ex. left and/or upper neighboring block) of the current block and additional candidate modes.
- the selected MPM index may be selected, or one of the remaining intra prediction modes that are not included in the MPM candidates (and the planner mode) may be selected based on the remaining intra prediction mode information.
- the MPM list may be configured to include or not include the planner mode as a candidate.
- the MPM list when the MPM list includes the planner mode as candidates, the MPM list may have 6 candidates, and when the MPM list does not include the planner mode as candidates, the MPM list may have 5 candidates.
- a not planar flag (ex. intra_luma_not_planar_flag) indicating whether the intra prediction mode of the current block is not the planar mode may be signaled.
- the MPM flag may be signaled first, and the MPM index and the not planner flag may be signaled when the value of the MPM flag is 1.
- the MPM index may be signaled when the value of the not planner flag is 1.
- the MPM list is configured not to include the planar mode as a candidate, rather than that the planar mode is not MPM, but the planar mode is always considered as MPM, so whether it is a planar mode by signaling a not planar flag. This is to check first.
- the intra prediction mode applied to the current block is among the MPM candidates (and planner mode) or the remaining mode may be indicated based on the MPM flag (ex. intra_luma_mpm_flag).
- a value of 1 of the MPM flag may indicate that an intra prediction mode for the current block is within MPM candidates (and planner mode), and a value of 0 of the MPM flag indicates that the intra prediction mode for the current block is within MPM candidates (and planner mode).
- a not planner flag (ex. intra_luma_not_planar_flag) value of 0 may indicate that an intra prediction mode for the current block is a planar mode
- a not planner flag value of 1 may indicate that an intra prediction mode for the current block is not a planar mode.
- the MPM index may be signaled in the form of an mpm_idx or intra_luma_mpm_idx syntax element
- the remaining intra prediction mode information may be signaled in the form of rem_intra_luma_pred_mode or intra_luma_mpm_remainder syntax element.
- the remaining intra prediction mode information may indicate one of the remaining intra prediction modes not included in MPM candidates (and planner mode) among all intra prediction modes by indexing them in the order of prediction mode numbers.
- the intra prediction mode may be an intra prediction mode for a luma component (sample).
- the intra prediction mode information includes at least one of the MPM flag (ex. intra_luma_mpm_flag), not planar flag (ex.
- intra_luma_not_planar_flag MPM index
- MPM index (ex. mpm_idx or intra_luma_mpm_idx)
- remainder intra prediction mode information rem_intra_luma_pred_mode).
- the MPM list may be referred to in various terms such as an MPM candidate list and candModeList.
- the encoder can use the intra prediction mode of the neighboring block to encode the intra prediction mode of the current block.
- the encoder/decoder can construct a list of most probable modes (MPM) for the current block.
- the MPM list may be referred to as an MPM candidate list.
- MPM may mean a mode used to improve coding efficiency in consideration of similarity between a current block and a neighboring block during intra prediction mode coding.
- the MPM list may be configured including a planner mode, or may be configured excluding a planner mode.
- the MPM list includes a planner mode
- the number of candidates in the MPM list may be six.
- the MPM list does not include the planner mode, the number of candidates in the MPM list may be five.
- the encoder/decoder can configure an MPM list including 5 or 6 MPMs.
- three types of modes can be considered: default intra modes, neighbor intra modes, and derived intra modes.
- default intra modes two neighboring blocks, that is, a left neighboring block and an upper neighboring block may be considered.
- the planar mode is excluded from the list, and the number of MPM list candidates may be set to five.
- non-directional mode (or non-angular mode) of the intra prediction modes may include a DC mode based on an average of neighboring reference samples of the current block or a planar mode based on interpolation. have.
- the prediction unit of the encoding device/decoding device may derive a prediction sample by performing inter prediction in block units.
- Inter prediction may represent a prediction derived in a method dependent on data elements (ex. sample values or motion information) of a picture(s) other than the current picture (Inter prediction can be a prediction derived in a manner that is dependent on data elements (ex. sample values or motion information) of picture(s) other than the current picture).
- a predicted block (prediction sample array) for the current block is derived based on a reference block (reference sample array) specified by a motion vector on a reference picture indicated by a reference picture index. I can.
- motion information of the current block may be predicted in units of blocks, subblocks, or samples based on correlation between motion information between neighboring blocks and current blocks.
- the motion information may include a motion vector and a reference picture index.
- the motion information may further include inter prediction type (L0 prediction, L1 prediction, Bi prediction, etc.) information.
- the neighboring block may include a spatial neighboring block existing in the current picture and a temporal neighboring block existing in the reference picture.
- the reference picture including the reference block and the reference picture including the temporal neighboring block may be the same or different.
- the temporal neighboring block may be called a collocated reference block, a co-located CU (colCU), or the like, and a reference picture including a temporal neighboring block may be referred to as a collocated picture (colPic).
- a motion information candidate list may be constructed based on neighboring blocks of the current block, and a flag indicating which candidate is selected (used) to derive a motion vector and/or a reference picture index of the current block, or Index information may be signaled.
- Inter prediction may be performed based on various prediction modes. For example, in the case of a skip mode and a merge mode, motion information of a current block may be the same as motion information of a selected neighboring block.
- a residual signal may not be transmitted.
- MVP motion vector prediction
- a motion vector of a selected neighboring block is used as a motion vector predictor, and a motion vector difference may be signaled.
- the motion vector of the current block may be derived by using the sum of the motion vector predictor and the motion vector difference.
- the motion information may include L0 motion information and/or L1 motion information according to an inter prediction type (L0 prediction, L1 prediction, Bi prediction, etc.).
- the motion vector in the L0 direction may be referred to as an L0 motion vector or MVL0
- the motion vector in the L1 direction may be referred to as an L1 motion vector or MVL1.
- the prediction based on the L0 motion vector may be called L0 prediction
- the prediction based on the L1 motion vector may be called the L1 prediction
- the prediction based on both the L0 motion vector and the L1 motion vector may be called the pair (Bi) prediction. .
- the motion vector L0 may represent a motion vector associated with the reference picture list L0 (L0), and the motion vector L1 may represent a motion vector associated with the reference picture list L1 (L1).
- the reference picture list L0 may include pictures prior to the current picture in an output order as reference pictures, and the reference picture list L1 may include pictures after the current picture in an output order. Previous pictures may be referred to as forward (reference) pictures, and subsequent pictures may be referred to as reverse (reference) pictures.
- the reference picture list L0 may further include pictures later in an output order than the current picture as reference pictures. In this case, previous pictures in the reference picture list L0 may be indexed first, and pictures afterwards may be indexed next.
- the reference picture list L1 may further include pictures preceding the current picture in an output order as reference pictures.
- subsequent pictures in the reference picture list 1 may be indexed first, and previous pictures may be indexed next.
- the output order may correspond to a picture order count (POC) order.
- POC picture order count
- FIG. 4 shows an example of a schematic video/video encoding method to which embodiments of this document are applicable.
- the method disclosed in FIG. 4 may be performed by the encoding apparatus 200 of FIG. 2 described above.
- S400 may be performed by the inter prediction unit 221 or the intra prediction unit 222 of the encoding apparatus 200, and S410, S420, S430, and S440 are respectively subtracted by the subtraction unit 231 of the encoding apparatus 200. ), the transform unit 232, the quantization unit 233, and the entropy encoding unit 240.
- the encoding apparatus may derive prediction samples through prediction of a current block (S400).
- the encoding apparatus may determine whether to perform inter prediction or intra prediction on the current block, and may determine a specific inter prediction mode or a specific intra prediction mode based on RD cost. According to the determined mode, the encoding apparatus may derive prediction samples for the current block.
- the encoding apparatus may derive residual samples by comparing the original samples for the current block with the prediction samples (S410).
- the encoding apparatus may derive transform coefficients through a transform procedure for residual samples (S420) and quantize the derived transform coefficients to derive quantized transform coefficients (S430).
- the encoding apparatus may encode image information including prediction information and residual information, and output the encoded image information in the form of a bitstream (S440).
- the prediction information is information related to a prediction procedure and may include prediction mode information and information about motion information (eg, when inter prediction is applied).
- the residual information may include information on quantized transform coefficients.
- the residual information may be entropy coded.
- the output bitstream may be delivered to a decoding device through a storage medium or a network.
- FIG. 5 shows an example of a schematic video/video decoding method to which embodiments of the present document are applicable.
- the method disclosed in FIG. 5 may be performed by the decoding apparatus 300 of FIG. 3 described above.
- S500 may be performed by the inter prediction unit 332 or the intra prediction unit 331 of the decoding apparatus 300.
- the procedure of deriving values of related syntax elements by decoding prediction information included in the bitstream in S500 may be performed by the entropy decoding unit 310 of the decoding apparatus 300.
- S510, S520, S530, and S540 may be performed by the entropy decoding unit 310, the inverse quantization unit 321, the inverse transform unit 322, and the addition unit 340 of the decoding apparatus 300, respectively.
- the decoding apparatus may perform an operation corresponding to an operation performed by the encoding apparatus.
- the decoding apparatus may perform inter prediction or intra prediction on the current block based on the received prediction information and derive prediction samples (S500).
- the decoding apparatus may derive quantized transform coefficients for the current block based on the received residual information (S510).
- the decoding apparatus may derive quantized transform coefficients from residual information through entropy decoding.
- the decoding apparatus may inverse quantize the quantized transform coefficients to derive transform coefficients (S520).
- the decoding apparatus derives residual samples through an inverse transform procedure for transform coefficients (S530).
- the decoding apparatus may generate reconstructed samples for the current block based on the prediction samples and the residual samples, and generate a reconstructed picture based on this. (S540). As described above, the in-loop filtering procedure may be further applied to the reconstructed picture after that.
- the quantization unit of the encoding device may apply quantization to the transform coefficients to derive quantized transform coefficients, and the inverse quantization unit of the encoding device or the inverse quantization unit of the decoding device inverse quantization of the quantized transform coefficients.
- the transform coefficients can be derived by applying.
- the quantization rate can be changed, and compression can be adjusted using the changed quantization rate.
- a quantization parameter can be used instead of using a quantization rate directly in consideration of complexity.
- quantization parameters of integer values from 0 to 63 may be used, and each quantization parameter value may correspond to an actual quantization rate.
- the quantization parameter QP Y for the luma component (luma sample) and the quantization parameter QP C for the chroma component (chroma sample) may be set differently.
- the quantization process takes a transform coefficient C as an input, divides it by a quantization rate Q step , and obtains a quantized transform coefficient C ⁇ based on this.
- the quantization rate is multiplied by a scale to form an integer, and a shift operation may be performed by a value corresponding to the scale value.
- a quantization scale may be derived based on the product of the quantization rate and the scale value. That is, a quantization scale can be derived according to the QP.
- a quantized transform coefficient C′ may be derived based on the quantization scale.
- the inverse quantization process is an inverse process of the quantization process, and a quantized transform coefficient (C ⁇ ) is multiplied by a quantization rate (Q step ), and a reconstructed transform coefficient (C ⁇ ) can be obtained based on this.
- a level scale may be derived according to the quantization parameter, and a reconstructed transform coefficient C ⁇ ) may be derived based on the level scale applied to the quantized transform coefficient C ⁇ .
- the reconstructed transform coefficient C ⁇ may be slightly different from the original transform coefficient C due to a loss in the transform and/or quantization process. Accordingly, the encoding device performs inverse quantization in the same manner as in the decoding device.
- an adaptive frequency weighting quantization technique that adjusts the quantization intensity according to the frequency may be applied.
- the adaptive frequency-weighted quantization technique is a method of applying different quantization strengths for each frequency.
- a quantization intensity for each frequency may be differently applied using a predefined quantization scaling matrix. That is, the above-described quantization/dequantization process may be further performed based on the quantization scaling matrix. For example, in order to generate the size of the current block and/or the residual signal of the current block, different quantization scaling metrics may be used depending on whether the prediction mode applied to the current block is inter prediction or intra prediction.
- the quantization scaling matrix may be called a quantization matrix or a scaling matrix.
- the quantization scaling matrix may be predefined.
- quantization scale information for each frequency for a quantization scaling matrix may be configured/encoded in an encoding device and signaled to a decoding device.
- Quantization scale information for each frequency may be referred to as quantization scaling information.
- the quantization scale information for each frequency may include scaling list data (scaling_list_data).
- scaling_list_data A (modified) quantization scaling matrix may be derived based on the scaling list data.
- the quantization scale information for each frequency may include present flag information indicating whether scaling list data is present.
- the scaling list data is signaled at a higher level (eg, SPS)
- information indicating whether scaling list data is modified at a lower level eg, PPS or tile group header, etc.
- the scaling list data may be signaled to indicate a (frequency based quantization) scaling matrix used for quantization/dequantization.
- ISP Intra sub-block partitioning
- IBC -Intra Block Copy
- CPR current picture referencing
- HSL high level syntax
- Table 1 is an excerpt from SPS to describe the scaling list for CVS.
- Semantics of syntax elements included in the SPS syntax of Table 1 may be represented as in Table 2 below.
- scaling_list_enabled_flag may be signaled from the SPS. For example, if the value of scaling_list_enabled_flag is 1, it may indicate that the scaling list is used in the scaling process for the transform coefficient, and if the value of scaling_list_enabled_flag is 0, it indicates that the scaling list is not used in the scaling process for the transform coefficient. I can. In this case, when the value of scaling_list_enabled_flag is 1, sps_scaling_list_data_present_flag may be further signaled from the SPS.
- sps_scaling_list_data_present_flag 1
- sps_scaling_list_data_present_flag 0
- the value of sps_scaling_list_data_present_flag may be inferred as 0.
- a flag (eg, pps_scaling_list_data_present_flag) may be first parsed from a picture parameter set (PPS). If this flag is available, scaling_list_data() can be parsed in PPS. If scaling_list_data() is initially present in the SPS and later parsed in the PPS, the data in the PPS may take precedence over the data in the SPS. Table 3 below is an excerpt from the PPS to describe the scaling list data.
- PPS picture parameter set
- Semantics of syntax elements included in the PPS syntax of Table 3 can be represented as in Table 4 below.
- pps_scaling_list_data_present_flag may be signaled from the PPS. For example, when the value of pps_scaling_list_data_present_flag is 1, it may indicate that scaling list data used for pictures referring to the PPS is derived based on the scaling list specified by the active SPS and the scaling list specified by the PPS . When the value of pps_scaling_list_data_present_flag is 0, it may indicate that scaling list data used for pictures referencing the PPS is inferred to be the same as the scaling list specified by the active SPS.
- the value of scaling_list_enabled_flag when the value of scaling_list_enabled_flag is 0, the value of pps_scaling_list_data_present_flag should be 0.
- the value of scaling_list_enabled_flag is 1, the value of sps_scaling_list_data_present_flag is 0, and the value of pps_scaling_list_data_present_flag is 0, as described in Scaling List Data Semantics, the default scaling list data can be used to derive a scaling factor array.
- the scaling list can be defined in the VVC standard for the next quantization matrix size. This can be expressed as shown in Table 5 below.
- the range of support for quantization matrices has been extended to include 2x2 and 64x64 in 4x4, 8x8, 16x16 and 32x32 in the HEVC standard.
- Table 5 above defines sizeId for all used quantization matrix sizes.
- matrixId may be assigned for different combinations of sizeId, prediction mode of the coding unit (CuPredMode), and color component.
- the CuPredMode that may be considered may be inter, intra, and intra block copy (IBC).
- Intra mode and IBC mode can be treated the same.
- the same matrixId(s) can be rhddbehlf for a given color component.
- the color components that can be considered may be luma (Y) and two color components (Cb and Cr).
- the allocated matrixId can be expressed as shown in Table 6 below.
- Table 6 shows matrixId according to sizeId, prediction mode, and color component.
- Table 7 shows an example of a syntax structure for scaling list data (eg, scaling_list_data()).
- scaling list data e.g., scaling_list_data()
- scaling list data is 2x2 chroma Component and 64x64 luma component.
- a flag e.g, scaling_list_pred_mode_flag
- scaling_list_pred_mode_flag sizeId][matrixId] is 1, scaling list data may be explicitly signaled.
- scaling_list_pred_matrix_id_delta When scaling_list_pred_matrix_id_delta is 0, as shown in Tables 9 to 12, a DEFAULT mode having a default value may be used. For other values of scaling_list_pred_matrix_id_delta, refMatrixId may be first determined as shown in the semantics of Table 8 above.
- the maximum number of signaled coefficients may be determined first. For quantization block sizes 2x2, 4x4, and 8x8, all coefficients can be signaled. In the case of a size larger than 8x8, that is, 16x16, 32x32 and 64x64, only 64 coefficients can be signaled. That is, the 8x8 base matrix is signaled and the remaining coefficients can be upsampled from the base matrix.
- scalingFactor a scaling factor
- Table 13 below shows examples of deriving a scaling factor according to a quantization matrix size based on the above-described default scaling list.
- the square-sized quantization matrix should be zero for samples that satisfy the following conditions.
- Table 15 shows an example of sizeIdW and sizeIdH according to the size of a quantization matrix.
- this document proposes a method of efficiently signaling scaling list data in applying an adaptive frequency-weighted quantization technique in a quantization/dequantization process.
- 6 exemplarily shows a hierarchical structure for a coded image/video.
- the coded video/video is a video coding layer (VCL) that deals with video/video decoding processing and itself, a subsystem for transmitting and storing coded information, and a VCL and subsystem. It exists between and is divided into a network abstraction layer (NAL) responsible for the network adaptation function.
- VCL video coding layer
- NAL network abstraction layer
- VCL data including compressed video data is generated, or a picture parameter set (PPS), a sequence parameter set (SPS), or a video parameter set (Video Parameter Set: A parameter set including information such as VPS) or a Supplemental Enhancement Information (SEI) message additionally required for a video decoding process may be generated.
- PPS picture parameter set
- SPS sequence parameter set
- SEI Supplemental Enhancement Information
- a NAL unit can be generated by adding header information (NAL unit header) to a Raw Byte Sequence Payload (RBSP) generated in VCL.
- RBSP refers to slice data, parameter set, SEI message, etc. generated in the VCL.
- the NAL unit header may include NAL unit type information specified according to RBSP data included in the corresponding NAL unit.
- the NAL unit may be divided into a VCL NAL unit and a non-VCL NAL unit according to the RBSP generated from the VCL.
- the VCL NAL unit may mean a NAL unit including information (slice data) on an image
- the Non-VCL NAL unit is a NAL unit including information (parameter set or SEI message) necessary for decoding an image.
- the VCL NAL unit and the Non-VCL NAL unit may be transmitted through a network by attaching header information according to the data standard of the sub-system.
- the NAL unit may be transformed into a data format of a predetermined standard, such as an H.266/VVC file format, Real-time Transport Protocol (RTP), Transport Stream (TS), and the like, and transmitted through various networks.
- a predetermined standard such as an H.266/VVC file format, Real-time Transport Protocol (RTP), Transport Stream (TS), and the like, and transmitted through various networks.
- the NAL unit type may be specified according to the RBSP data structure included in the NAL unit, and information on the NAL unit type may be stored and signaled in the NAL unit header.
- the NAL unit may be largely classified into a VCL NAL unit type and a Non-VCL NAL unit type.
- the VCL NAL unit type may be classified according to the nature and type of a picture included in the VCL NAL unit, and the non-VCL NAL unit type may be classified according to the type of a parameter set.
- NAL unit type specified according to the type of a parameter set included in the Non-VCL NAL unit type.
- NAL unit Type for NAL unit including APS
- NAL unit a type for a NAL unit including DPS
- VPS Video Parameter Set
- NAL unit a type for a NAL unit including SPS
- NAL unit A type for a NAL unit including PPS
- NAL unit A type for a NAL unit including PH
- NAL unit types have syntax information for the NAL unit type, and the syntax information may be stored in the NAL unit header and signaled.
- the syntax information may be nal_unit_type, and NAL unit types may be specified as nal_unit_type values.
- one picture may include a plurality of slices, and one slice may include a slice header and slice data.
- one picture header may be further added to a plurality of slices (slice header and slice data set) in one picture.
- the picture header (picture header syntax) may include information/parameters commonly applicable to a picture.
- tile groups may be mixed or replaced with slices or pictures.
- the tile group header may be mixed or replaced with a slice header or a picture header.
- the slice header may include information/parameters commonly applicable to a slice.
- APS APS syntax
- PPS PPS syntax
- SPS SPS syntax
- VPS VPS syntax
- DPS DPS syntax
- CVS coded video sequence
- a high level syntax may include at least one of the APS syntax, PPS syntax, SPS syntax, VPS syntax, DPS syntax, picture header syntax, and slice header syntax.
- the image/video information encoded by the encoding device to the decoding device and signaled in the form of a bitstream not only includes information related to intra-picture partitioning, intra/inter prediction information, residual information, in-loop filtering information, etc.
- the image/video information may further include information on a NAL unit header.
- the adaptation parameter set is used to transmit information for an adaptive loop filter (ALF) and luma mapping with chroma scaling (LMCS) procedure in the VVC standard.
- ALF adaptive loop filter
- LMCS luma mapping with chroma scaling
- the APS has a structure that can be extended so that it can be used to transmit other data structures (ie, different syntax structures). Accordingly, this document proposes a method of parsing/signaling scaling list data used for weighted quantization for each frequency through APS.
- the scaling list data is quantization scale information for weighted quantization for each frequency that can be applied in the quantization/dequantization process, and may be a list that associates a scale factor with each frequency index.
- Table 16 below shows an example of an adaptation parameter set (APS) structure used to transmit scaling list data.
- APS adaptation parameter set
- Semantics of syntax elements included in the APS syntax of Table 16 may be represented as in Table 17 below.
- an adaptation_parameter_set_id syntax element may be parsed/signaled in APS.
- adaptation_parameter_set_id provides an identifier for APS for referencing other syntax elements. That is, the APS may be identified based on the adaptation_parameter_set_id syntax element.
- the adaptation_parameter_set_id syntax element may be called APS ID information.
- the APS can be shared between pictures and can be different in different tile groups within a picture.
- aps_params_type syntax element may be parsed/signaled in the APS.
- aps_params_type may indicate the type of APS parameter transmitted in APS, as shown in Table 18 below.
- the aps_params_type syntax element may be called APS parameter type information or APS type information.
- Table 18 is an example of the types of APS parameters that can be transmitted through APS, and each APS parameter type may be indicated corresponding to a value of aps_params_type.
- aps_params_type may be a syntax element for classifying a type of a corresponding APS.
- the corresponding APS type may be ALF_APS
- the corresponding APS may carry ALF data
- the ALF data may include ALF parameters for deriving filter/filter coefficients.
- the corresponding APS type may be LMCS_APS
- the corresponding APS may carry LMCS data
- the LMCS data may include LMCS parameters for deriving the LMCS model/bins/mapping index.
- the corresponding APS type may be SCALING_APS, and the corresponding APS may carry SCALING list data, and the SCALING list data is a frequency-based quantization scaling matrix/scaling factor/scaling to derive the value of the scaling list. May contain list data parameters.
- the aps_params_type syntax element may be parsed/signaled in the APS, and at this time, when aps_params_type represents 0 (i.e., when aps_params_type represents ALF_APS) ALF data (i.e., alf_data() ) Can be parsed/signaled.
- ALF data i.e., alf_data()
- aps_params_type represents 1
- LMCS data ie, lmcs_data()
- scaling list data ie, scaling_list_data()
- an aps_extension_flag syntax element may be parsed/signaled in the APS.
- the aps_extension_flag may indicate whether the APS extension data flag (aps_extension_data_flag) syntax elements exist.
- the aps_extension_flag may be used, for example, to provide extension points for a later version of the VVC standard.
- the aps_extension_flag syntax element may be referred to as an APS extension flag. For example, when the value of aps_extension_flag is 0, it may indicate that the APS extension data flag (aps_extension_data_flag) does not exist in the APS RBSP syntax structure. Alternatively, when the value of aps_extension_flag is 1, it may indicate that the APS extension data flag (aps_extension_data_flag) exists in the APS RBSP syntax structure.
- the aps_extension_data_flag syntax element may be parsed/signaled based on the aps_extension_flag syntax element.
- the aps_extension_data_flag syntax element may be referred to as an APS extended data flag. For example, when the value of aps_extension_flag is 1, aps_extension_data_flag may be parsed/signaled, and in this case, aps_extension_data_flag may have an arbitrary value.
- a data type (eg, SCALING_APS) for representing the scaling list data is allocated, and a syntax element representing the data type (eg, aps_params_type) is parsed/signaled to efficiently scale.
- a syntax element representing the data type (eg, aps_params_type) is parsed/signaled to efficiently scale.
- Can carry list data That is, according to an embodiment of the present document, an APS structure in which scaling list data is integrated may be used.
- scaling list data i.e. scaling_list_data()
- a flag indicating whether scaling list data is available i.e., sps_scaling_list_enabled_flag
- SPS Sequence Parameter Set
- scaling list data ie, scaling_list_data()
- scaling list data is signaled by the SPS.
- the SPS since the SPS enables session negotiation and is generally transmitted out of band, it may be used during the decoding process and it may be unnecessary to transmit the scaling list data with information related to the determination of the scaling factor of the transform block.
- this document proposes a hierarchical structure to effectively parse/signal the scaling list data.
- the scaling list data is not parsed/signaled from the SPS, which is a higher-level syntax, and can be parsed/signaled in the lower-level syntax, PPS, tile group header, slice header, and/or other appropriate header.
- the SPS syntax can be modified as shown in Table 19 below.
- Table 19 below shows an example of SPS syntax for describing a scaling list for CVS.
- syntax elements included in the SPS syntax of Table 19 may be represented as in Table 20 below.
- a scaling_list_enabled_flag syntax element may be parsed/signaled in the SPS.
- the scaling_list_enabled_flag syntax element may indicate whether a scaling list is available based on whether its value is 0 or 1. For example, if the value of scaling_list_enabled_flag is 1, it may indicate that the scaling list is used for the scaling process for the transform coefficient, and if the value of scaling_list_enabled_flag is 0, it may indicate that the scaling list is not used for the scaling process for the transform coefficient. .
- the scaling_list_enabled_flag syntax element may be called a scaling list available flag, and may be signaled in SPS (or SPS level).
- SPS or SPS level
- an additional available flag may be signaled at a lower level than the SPS (eg, PPS, tile group header, slice header, and/or other appropriate header) to obtain a scaling list.
- the scaling list (scaling_list_data()) is not directly signaled at the SPS level, but only the scaling list available flag (scaling_list_enabled_flag) may be explicitly signaled. Thereafter, based on the available flag (scaling_list_enabled_flag) in the SPS, the scaling list (scaling_list_data()) may be individually parsed in the lower level syntax. Accordingly, according to an embodiment of the present document, since scaling list data may be parsed/signaled according to a hierarchical structure, coding efficiency may be further improved.
- the presence or absence of the scaling list data and the use of the scaling list data is conditional on the existence of a tool enabling flag.
- the tool enabling flag may be information indicating whether to enable the corresponding tool, and may include, for example, a scaling_list_enabled_flag syntax element. That is, the scaling_list_enabled_flag syntax element may be used to indicate whether to enable the scaling list by indicating whether scaling list data is available.
- this tool must have syntactic restrictions on the decoder. That is, there should be a constraint flag to inform the decoder that this tool is not currently being used for decoding a coded video sequence (CVS). Therefore, this document proposes a method of applying a restriction flag for scaling list data.
- Table 21 shows an example of a syntax (eg, general restriction information syntax) for signaling scaling list data using a restriction flag.
- a syntax eg, general restriction information syntax
- Semantics of syntax elements included in the syntax of Table 21 can be represented as in Table 22 below.
- the restriction flag may be parsed/signaled through general_constraint_info().
- general_constraint_info() may be referred to as a general restriction information field or information on restriction flags.
- the no_scaling_list_constraint_flag syntax element may be used as the restriction flag.
- the restriction flag may be used to designate conformance bitstream properties. For example, if the value of the no_scaling_list_constraint_flag syntax element is 1, it indicates the bitstream conformacne requirement that scaling_list_enabled_flag should be designated as 0, and if the value of the no_scaling_list_constraint_flag syntax element is 0, it may indicate that there is no restriction.
- scaling list data may be transmitted through a hierarchical structure. Accordingly, this document proposes a structure of scaling list data that can be parsed/signaled through a slice header.
- the slice header may be referred to as a tile group header, or may be mixed or replaced with a picture header.
- Table 23 shows an example of slice header syntax for signaling scaling list data.
- syntax elements included in the slice header syntax of Table 23 may be represented as in Table 24 below.
- a slice_pic_parameter_set_id syntax element may be parsed/signaled in a slice header.
- the slice_pic_parameter_set_id syntax element may indicate an identifier for a PPS in use. That is, the slice_pic_parameter_set_id syntax element is information for identifying a PPS referenced by a corresponding slice, and may indicate a value of pps_pic_parameter_set_id. The value of slice_pic_parameter_set_id must be in the range of 0 to 63.
- the slice_pic_parameter_set_id syntax element may be referred to as PPS identification information or PPS ID information referenced by a slice.
- slice_scaling_list_enabled_flag syntax element may be parsed/signaled in the slice header.
- the slice_scaling_list_enabled_flag syntax element may indicate whether a scaling list is available in the current slice. For example, if the value of slice_scaling_list_enabled_flag is 1, it may indicate that the scaling list is available in the current slice, and if the value of slice_scaling_list_enabled_flag is 0, it may indicate that the scaling list is not available in the current slice. Alternatively, if slice_scaling_list_enabled_flag does not exist in the slice header, the value may be inferred as 0.
- whether to parse the slice_scaling_list_enabled_flag syntax element may be determined based on the scaling_list_enabled_flag syntax element signaled in the higher level syntax (ie, SPS). For example, if the value of scaling_list_enabled_flag signaled by the SPS is 1 (i.e., when scaling list data is determined to be available at a higher level), the slice_scaling_list_enabled_flag is parsed from the slice header, and the scaling process is performed using the scaling list in the slice. You can decide whether to do it or not.
- SPS the scaling_list_enabled_flag syntax element signaled in the higher level syntax
- the slice_scaling_list_aps_id syntax element may be parsed/signaled in the slice header.
- the slice_scaling_list_aps_id syntax element may indicate an identifier for an APS referenced by a corresponding slice. That is, the slice_scaling_list_aps_id syntax element may represent ID information (adaptation_parameter_set_id) of APS including scaling list data referenced by a corresponding slice.
- TemporalId i.e., Temporal ID
- APS NAL unit i.e., APS NAL unit including scaling list data
- TemporalId i.e., Temporal ID
- whether to parse the slice_scaling_list_aps_id syntax element may be determined based on the slice_scaling_list_enabled_flag syntax element. For example, when the value of slice_scaling_list_aps_id is 1 (that is, when a scaling list is determined to be available in a slice header), slice_scaling_list_aps_id may be parsed. Thereafter, scaling list data may be obtained from the APS indicated by the parsed slice_scaling_list_aps_id.
- APS ID information of the same value ( Multiple SCALING DATA APS with adaptation_parameter_set_id) must contain the same content.
- each of the slice header syntax elements slice_pic_parameter_set_id, slice_pic_order_cnt_lsb, and slice_temporal_mvp_enabled_flag must be the same in all slice headers in the picture to be coded.
- a hierarchical structure may be used to efficiently signal scaling list data. That is, an available flag indicating whether scaling list data is available at a higher level (SPS syntax) (e.g. scaling_list_enabled_flag) is signaled first, and then additional available flags (e.g. slice_scaling_list_enabled_flag) at a lower level (e.g., slice header, picture header, etc.) ) Can be used to determine whether to use scaling list data at each lower level.
- SPS syntax e.g. scaling_list_enabled_flag
- additional available flags e.g. slice_scaling_list_enabled_flag
- APS ID information (eg slice_scaling_list_aps_id) referenced by a corresponding slice or tile group is signaled through a lower level (eg, slice header, picture header, etc.), and scaling list data is derived from the APS identified by the APS ID information. can do.
- this document may be applied as the method proposed in Tables 23 and 24 above, and scaling list data through the structure of a slice header as shown in Table 25 below. Can also be delivered.
- Table 25 shows an example of slice header syntax for signaling scaling list data.
- the slice header may be referred to as a tile group header, or may be mixed or replaced with a picture header.
- syntax elements included in the slice header syntax of Table 25 may be represented as in Table 26 below.
- a slice_pic_parameter_set_id syntax element may be parsed/signaled in a slice header.
- the slice_pic_parameter_set_id syntax element may indicate an identifier for a PPS in use. That is, the slice_pic_parameter_set_id syntax element is information for identifying a PPS referenced by a corresponding slice, and may indicate a value of pps_pic_parameter_set_id. The value of slice_pic_parameter_set_id must be in the range of 0 to 63.
- the slice_pic_parameter_set_id syntax element may be referred to as PPS identification information or PPS ID information referenced by a slice.
- the slice_scaling_list_aps_id syntax element may be parsed/signaled in the slice header.
- the slice_scaling_list_aps_id syntax element may indicate an identifier for an APS referenced by a corresponding slice. That is, the slice_scaling_list_aps_id syntax element may represent ID information (adaptation_parameter_set_id) of APS including scaling list data referenced by a corresponding slice.
- TemporalId i.e., Temporal ID
- APS NAL unit i.e., APS NAL unit including scaling list data
- TemporalId i.e., Temporal ID
- whether to parse the slice_scaling_list_aps_id syntax element may be determined based on the scaling_list_enabled_flag syntax element signaled in the higher level syntax (ie, SPS). For example, when the value of scaling_list_enabled_flag signaled by the SPS is 1 (that is, when scaling list data is determined to be available at a higher level), slice_scaling_list_aps_id may be parsed from a slice header. Thereafter, scaling list data may be obtained from the APS indicated by the parsed slice_scaling_list_aps_id.
- SPS scaling_list_enabled_flag syntax element signaled in the higher level syntax
- the APS ID including the scaling list data can be parsed when a corresponding flag (eg, scaling_list_enabled_flag) in the SPS is enabled.
- a corresponding flag eg, scaling_list_enabled_flag
- the APS ID i.e., SPS
- APS ID e.g, slice_scaling_list_aps_id
- slice_scaling_list_aps_id information including scaling list data to be referenced in a corresponding lower level (eg, slice header or picture header) can be parsed based on the scaling_list_enabled_flag syntax element signaled in ).
- this document proposes a method of using a plurality of APS to signal scaling list data.
- a method of efficiently signaling a plurality of APS IDs including scaling list data according to an embodiment of the present document will be described. This method can be useful during bitstream merge.
- Table 27 shows an example of a slice header syntax for signaling scaling list data using a plurality of APS.
- the slice header may be referred to as a tile group header, or may be mixed or replaced with a picture header.
- syntax elements included in the slice header syntax of Table 27 may be represented as in Table 28 below.
- the slice_pic_parameter_set_id syntax element may be parsed/signaled in a slice header.
- the slice_pic_parameter_set_id syntax element and the slice_pic_parameter_set_id syntax element may indicate an identifier for a PPS in use. That is, the slice_pic_parameter_set_id syntax element is information for identifying a PPS referenced by a corresponding slice, and may indicate a value of pps_pic_parameter_set_id. The value of slice_pic_parameter_set_id must be in the range of 0 to 63.
- the slice_pic_parameter_set_id syntax element may be referred to as PPS identification information or PPS ID information referenced by a slice.
- slice_scaling_list_enabled_flag syntax element may be parsed/signaled in the slice header.
- the slice_scaling_list_enabled_flag syntax element may indicate whether a scaling list is available in the current slice. For example, if the value of slice_scaling_list_enabled_flag is 1, it may indicate that the scaling list is available in the current slice, and if the value of slice_scaling_list_enabled_flag is 0, it may indicate that the scaling list is not available in the current slice. Alternatively, if slice_scaling_list_enabled_flag does not exist in the slice header, the value may be inferred as 0.
- whether to parse the slice_scaling_list_enabled_flag syntax element may be determined based on the scaling_list_enabled_flag syntax element signaled in the higher level syntax (ie, SPS). For example, if the value of scaling_list_enabled_flag signaled by the SPS is 1 (i.e., when scaling list data is determined to be available at a higher level), the slice_scaling_list_enabled_flag is parsed from the slice header, and the scaling process is performed using the scaling list in the slice. You can decide whether to do it or not.
- SPS the scaling_list_enabled_flag syntax element signaled in the higher level syntax
- the num_scaling_list_aps_ids_minus1 syntax element may be parsed/signaled in the slice header.
- the num_scaling_list_aps_ids_minus1 syntax element may be information for indicating the number of APS including scaling list data referenced by a corresponding slice. For example, a value obtained by adding 1 to the value of the num_scaling_list_aps_ids_minus1 syntax element may be the number of APS.
- the value of num_scaling_list_aps_ids_minus1 must be in the range of 0 to 7.
- whether to parse the num_scaling_list_aps_ids_minus1 syntax element may be determined based on the slice_scaling_list_enabled_flag syntax element. For example, when the value of slice_scaling_list_enabled_flag is 1 (that is, when scaling list data is determined to be available in the corresponding slice), num_scaling_list_aps_ids_minus1 may be parsed. In this case, the slice_scaling_list_aps_id[i] syntax element may be parsed/signaled based on the value of num_scaling_list_aps_ids_minus1.
- slice_scaling_list_aps_id[i] may represent the identifier (adaptation_parameter_set_id) of the APS (ie, the i-th SCALING LIST APS) including the i-th scaling list data.
- APS ID information may be signaled as much as the number of APS indicated by the num_scaling_list_aps_ids_minus1 syntax element.
- the TemporalId (ie, Temporal ID) of the APS NAL unit (ie, APS NAL unit including scaling list data) having the same APS ID information (adaptation_parameter_set_id) as slice_scaling_list_aps_id[ i] is coded. , Temporal ID).
- APS ID information of the same value ( Multiple SCALING DATA APS with adaptation_parameter_set_id) must contain the same content.
- FIG. 7 is a flowchart schematically illustrating an example of a video/video encoding method according to the embodiment(s) of this document.
- the method disclosed in FIG. 7 may be performed by the encoding apparatus 200 disclosed in FIG. 2. Specifically, step S700 of FIG. 7 may be performed by the subtraction unit 231 disclosed in FIG. 2, and step S710 of FIG. 7 may be performed by the conversion unit 232 disclosed in FIG. 2, and Steps S720 to S730 may be performed by the quantization unit 233 disclosed in FIG. 2, and step S740 of FIG. 7 may be performed by the entropy encoding unit 240 disclosed in FIG. 2.
- the method disclosed in FIG. 7 may be performed including the embodiments described above in this document. Accordingly, in FIG. 7, detailed descriptions of content overlapping with the above-described embodiments will be omitted or simplified.
- the encoding apparatus may derive residual samples for a current block (S700).
- the encoding apparatus may determine a prediction mode for a current block and derive prediction samples. For example, the encoding apparatus may determine whether to perform inter prediction or intra prediction on the current block, and may also determine a specific inter prediction mode or a specific intra prediction mode based on the RD cost. The encoding device may derive prediction samples for the current block by performing prediction according to the determined prediction mode. In this case, various prediction methods disclosed in this document, such as inter prediction or intra prediction, may be applied. In addition, the encoding device may generate and encode information related to prediction (eg, prediction mode information) applied to the current block.
- prediction mode information e.g, prediction mode information
- the encoding apparatus may derive residual samples by comparing the original samples and the prediction samples for the current block.
- the encoding apparatus may derive transform coefficients based on the residual samples (S710).
- the encoding apparatus may derive transform coefficients through a transform process for residual samples.
- the encoding device may determine whether to apply the transform to the current block in consideration of coding efficiency. That is, the encoding device may determine whether or not the transformation is applied to the residual samples. For example, when a transform is not applied to residual samples, the encoding apparatus may derive the residual samples as transform coefficients. Alternatively, when transform is applied to residual samples, the encoding apparatus may derive transform coefficients by performing transform on the residual samples.
- the encoding device may generate and encode transformation skip flag information based on whether transformation is applied to the current block.
- the transformation skip flag information may be information indicating whether transformation has been applied to the current block or whether transformation has been skipped.
- the encoding apparatus may derive quantized transform coefficients based on the transform coefficients (S720).
- the encoding apparatus may derive quantized transform coefficients by applying a quantization process to the transform coefficients.
- the encoding apparatus may apply weighted quantization for each frequency that adjusts the quantization intensity according to the frequency.
- the quantization process may be further performed based on a quantization scale value for each frequency.
- a quantization scale value for weighted quantization for each frequency can be derived using a scaling matrix.
- the encoding device/decoding device may use a predefined scaling matrix, or the encoding device may configure and encode quantization scale information for each frequency for the scaling matrix, and signal this to the decoding device.
- the quantization scale information for each frequency may include scaling list data.
- a scaling matrix (modified) can be derived based on the scaling list data.
- the encoding device may perform an inverse quantization process in the same manner as in the decoding device.
- the encoding apparatus may derive a (modified) scaling matrix based on the scaling list data, and apply inverse quantization to the quantized transform coefficients based on this, to derive reconstructed transform coefficients.
- the restored transform coefficients may be different from the original transform coefficients due to a loss in the transform/quantization process.
- the scaling matrix may refer to the above-described frequency-based quantization scaling matrix, and may be used interchangeably or in place of a quantization scaling matrix, a quantization matrix, a scaling matrix, a scaling list, etc. for convenience of description, and is used in the present embodiment. Is not limited to the specific name.
- the encoding apparatus may further apply weighted quantization for each frequency, and in this case, may generate scaling list data as information on the scaling matrix. Since this process has been described in detail using Tables 5 to 15 as an example, redundant content or detailed description will be omitted in this embodiment.
- the encoding apparatus may generate residual information including information on quantized transform coefficients (S730).
- the residual information may include information such as value information of quantized transform coefficients, position information, a transform technique, a transform kernel, and a quantization parameter.
- the encoding device may encode image information (or video information) (S740).
- the image information may include the residual information.
- the image information may include information related to the prediction (eg, prediction mode information).
- the image information may include information on the scaling list data. That is, the image information may include various pieces of information derived during the encoding process, and may be encoded including such various pieces of information.
- the image information may include various information according to the embodiment(s) described above in this document, and may include information disclosed in at least one of Tables 1 to 28 described above.
- the image information may include an adaptation parameter set (APS).
- the APS may include APS identification information (APS ID information) and type information of APS parameters.
- the APS may include scaling list data based on type information of APS parameters.
- the scaling list data may include scaling list parameters for deriving a scaling list/scaling matrix/scaling factor used in a quantization/dequantization process.
- the scaling list data may include syntax elements used to construct the scaling list.
- the APS may be configured as shown in Table 16 above.
- the APS identification information may be an adaptation_parameter_set_id described in Tables 16 and 17 above.
- the type information of the APS parameters may be aps_params_type described in Tables 16 to 18.
- aps_params_type described in Tables 16 to 18.
- APS May include scaling list data (eg, scaling_list_data()). That is, the encoding device may signal scaling list data (eg, scaling_list_data()) through the APS based on SCALING_APS type information indicating that the APS is an APS including scaling list data.
- the image information may include header information.
- the header information may be header information related to a slice or a picture including the current block, and may include, for example, a picture header or a slice header.
- the header information may include APS identification information related to scaling list data.
- the APS identification information related to scaling list data included in the header information may indicate identification information of the APS including the scaling list data.
- the APS identification information related to scaling list data included in the header information may be slice_scaling_list_aps_id described in Tables 23 to 26, and includes APS (scaling list data) referenced by a slice/picture including the current block. ) May be identification information. That is, based on APS identification information related to scaling list data, an APS including scaling list data may be identified.
- the image information may include a sequence parameter set (SPS).
- SPS may include first available flag information indicating whether scaling list data is available.
- the SPS may be configured as shown in Table 19, and the first available flag information may be scaling_list_enabled_flag described in Tables 19 and 20.
- the header information is a scaling list
- Data-related APS identification information eg, slice_scaling_list_aps_id
- the encoding device may signal the identification information of the APS (eg, slice_scaling_list_aps_id) including the scaling list data through header information based on the first available flag information (eg, scaling_list_enabled_flag) as shown in Tables 23 and 25 described above. I can.
- the header information may include second available flag information indicating whether scaling list data is available in a picture or slice.
- the second available flag information may be slice_scaling_list_enabled_flag described in Tables 23 and 24 above.
- the header information is second It may include available flag information (eg slice_scaling_list_enabled_flag).
- the header information is APS identification information related to scaling list data (for example: slice_scaling_list_aps_id) may be included.
- the encoding device may signal the second available flag information (eg, slice_scaling_list_enabled_flag) through header information based on the first available flag information (eg, scaling_list_enabled_flag) signaled by the SPS as shown in Table 23 above, and then Based on the second available flag information (eg, slice_scaling_list_enabled_flag), APS identification information related to scaling list data (eg, slice_scaling_list_aps_id) may be signaled through header information.
- the second available flag information eg, slice_scaling_list_enabled_flag
- the image information may include restriction flag information regarding the use of the first available flag information.
- the restriction flag information may be no_scaling_list_constraint_flag described in Tables 21 and 22 described above.
- the restriction flag information (eg, no_scaling_list_constraint_flag) may be included in the general restriction information syntax (eg, general_constraint_info()) and signaled. For example, when the value of the restriction flag information (e.g. no_scaling_list_constraint_flag) is 1, the value of the first available flag information (e.g.
- scaling_list_enabled_flag is set to 0 so that it is restricted through the general restriction information syntax (e.g., general_constraint_info()) Can be placed.
- general_constraint_info e.g., general_constraint_info
- the image information may include header information related to a slice or picture including the current block.
- the header information may include a picture header or a slice header.
- the header information may include APS number information indicating the number of APS identification information related to scaling list data.
- the header information may include APS identification information related to scaling list data as many as the number of APS identification information derived based on the APS number information.
- the number of APS information may be num_scaling_list_aps_ids_minus1 described in Tables 27 and 28 above. As described in Table 27, a value obtained by adding 1 to the value of num_scaling_list_aps_ids_minus1 may be the number of APS identification information. Accordingly, the number of APS identification information (a value obtained by adding 1 to the value of num_scaling_list_aps_ids_minus1) as many slice_scaling_list_aps_id may be included in header information.
- Image information including various types of information as described above may be encoded and 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, and SSD.
- FIG. 8 is a flowchart schematically illustrating an example of a video/video decoding method according to the embodiment(s) of this document.
- the method disclosed in FIG. 8 may be performed by the decoding apparatus 300 disclosed in FIG. 3. Specifically, steps S800 to S810 of FIG. 8 may be performed by the entropy decoding unit 310 disclosed in FIG. 3, and step S820 of FIG. 8 may be performed by the inverse quantization unit 321 disclosed in FIG. 3. , Step S830 of FIG. 8 may be performed by the inverse transform unit 321 disclosed in FIG. 3, and step S840 of FIG. 8 may be performed by the adder 340 disclosed in FIG. 3. In addition, the method disclosed in FIG. 8 may be performed including the embodiments described above in this document. Accordingly, in FIG. 8, detailed descriptions of contents overlapping with the above-described embodiments will be omitted or simplified.
- the decoding apparatus may receive image information (or video information) from a bitstream (S800).
- the decoding apparatus may parse the bitstream to derive information (eg, video/video information) necessary for image restoration (or picture restoration).
- the image information may include residual information, and the residual information may include information such as value information of quantized transform coefficients, location information, a transform technique, a transform kernel, and a quantization parameter.
- the image information may include information related to prediction (eg, prediction mode information).
- the image information may include information on scaling list data. That is, the image information may include various information necessary in the decoding process, and may be decoded based on a coding method such as exponential Golomb coding, CAVLC or CABAC.
- the image information may include various information according to the embodiment(s) described above in this document, and may include information disclosed in at least one of Tables 1 to 28 described above.
- the image information may include an adaptation parameter set (APS).
- the APS may include APS identification information and type information of APS parameters.
- the APS may include scaling list data based on type information of APS parameters.
- the scaling list data may include scaling list parameters for deriving a scaling list/scaling matrix/scaling factor used in a quantization/dequantization process.
- the scaling list data may include syntax elements used to construct the scaling list.
- the APS may be configured as shown in Table 16 above.
- the APS identification information may be an adaptation_parameter_set_id described in Tables 16 and 17 above.
- the type information of the APS parameters may be aps_params_type described in Tables 16 to 18.
- aps_params_type described in Tables 16 to 18.
- APS May include scaling list data (eg, scaling_list_data()). That is, the decoding apparatus may acquire and parse scaling list data (eg, scaling_list_data()) through the APS based on SCALING_ APS type information indicating that the APS is an APS including scaling list data.
- the image information may include header information.
- the header information may be header information related to a slice or a picture including the current block, and may include, for example, a picture header or a slice header.
- the header information may include APS identification information related to scaling list data.
- the APS identification information related to scaling list data included in the header information may indicate identification information of the APS including the scaling list data.
- the APS identification information related to scaling list data included in the header information may be slice_scaling_list_aps_id described in Tables 23 to 26, and includes APS (scaling list data) referenced by a slice/picture including the current block. ) May be identification information. That is, the decoding apparatus may identify the APS based on the APS identification information (eg, slice_scaling_list_aps_id) of the header information, and obtain scaling list data from the APS.
- the image information may include a sequence parameter set (SPS).
- SPS may include first available flag information indicating whether scaling list data is available.
- the SPS may be configured as shown in Table 19, and the first available flag information may be scaling_list_enabled_flag described in Tables 19 and 20.
- the header information is a scaling list
- Data-related APS identification information (eg, slice_scaling_list_aps_id) may be included.
- the decoding device may obtain identification information (eg, slice_scaling_list_aps_id) of APS including scaling list data through header information based on first available flag information (eg, scaling_list_enabled_flag) as shown in Tables 23 and 25 described above. I can.
- the header information may include second available flag information indicating whether scaling list data is available in a picture or slice.
- the second available flag information may be slice_scaling_list_enabled_flag described in Tables 23 and 24 above.
- the header information is second It may include available flag information (eg slice_scaling_list_enabled_flag).
- the header information is APS identification information related to scaling list data (for example: slice_scaling_list_aps_id) may be included.
- the decoding apparatus may acquire second available flag information (eg, slice_scaling_list_enabled_flag) through header information based on the first available flag information (eg, scaling_list_enabled_flag) signaled by the SPS as shown in Table 23 above, and then APS identification information (eg, slice_scaling_list_aps_id) related to scaling list data may be obtained through header information based on the second available flag information (eg, slice_scaling_list_enabled_flag).
- second available flag information eg, slice_scaling_list_enabled_flag
- the image information may include restriction flag information regarding the use of the first available flag information.
- the restriction flag information may be no_scaling_list_constraint_flag described in Tables 21 and 22 described above.
- the restriction flag information (eg, no_scaling_list_constraint_flag) may be included in the general restriction information syntax (eg, general_constraint_info()) and signaled. For example, when the value of the restriction flag information (e.g. no_scaling_list_constraint_flag) is 1, the value of the first available flag information (e.g.
- scaling_list_enabled_flag is set to 0 so that it is restricted through the general restriction information syntax (e.g., general_constraint_info()) Can be placed.
- general_constraint_info e.g., general_constraint_info
- the image information may include header information related to a slice or picture including the current block.
- the header information may include a picture header or a slice header.
- the header information may include APS number information indicating the number of APS identification information related to scaling list data.
- the header information may include APS identification information related to scaling list data as many as the number of APS identification information derived based on the APS number information.
- the number of APS information may be num_scaling_list_aps_ids_minus1 described in Tables 27 and 28 above. As described in Table 27, a value obtained by adding 1 to the value of num_scaling_list_aps_ids_minus1 may be the number of APS identification information. Accordingly, the number of APS identification information (a value obtained by adding 1 to the value of num_scaling_list_aps_ids_minus1) as many slice_scaling_list_aps_id may be included in header information.
- the decoding apparatus may derive quantized transform coefficients for the current block (S810).
- the decoding apparatus may acquire residual information included in the image information.
- the residual information may include information such as value information of quantized transform coefficients, position information, a transform technique, a transform kernel, and a quantization parameter.
- the decoding apparatus may derive quantized transform coefficients for the current block based on quantized transform coefficient information included in the residual information.
- the decoding apparatus may derive transform coefficients based on the quantized transform coefficients (S820).
- the decoding apparatus may derive transform coefficients by applying an inverse quantization process to the quantized transform coefficients.
- the decoding apparatus may apply weighted quantization for each frequency that adjusts the quantization strength according to the frequency.
- the inverse quantization process may be further performed based on a quantization scale value for each frequency.
- a quantization scale value for weighted quantization for each frequency can be derived using a scaling matrix.
- the decoding apparatus may use a predefined scaling matrix, or may use quantization scale information for each frequency for the scaling matrix signaled from the encoding apparatus.
- the quantization scale information for each frequency may include scaling list data.
- a scaling matrix (modified) can be derived based on the scaling list data.
- the decoding apparatus may further apply weighted quantization for each frequency in performing the inverse quantization process.
- the decoding apparatus may derive the transform coefficients by applying an inverse quantization process to the quantized transform coefficients based on the scaling list data.
- the decoding apparatus may acquire APS included in image information, and may acquire scaling list data based on type information of APS parameters included in APS. For example, the decoding apparatus may acquire scaling list data included in the APS based on SCALING_APS type information indicating that the APS is an APS including scaling list data. In this case, the decoding apparatus may derive a scaling matrix based on the scaling list data, derive a scaling factor based on the scaling matrix, and derive transform coefficients by applying inverse quantization based on the scaling factor. . Since the process of performing scaling based on the scaling list data has been described in detail using Tables 5 to 15 as an example, redundant content or detailed description will be omitted in the present embodiment.
- the decoding apparatus may determine whether to apply weighted quantization for each frequency in the inverse quantization process (that is, whether to derive transform coefficients using the (frequency-based quantization) scaling list in the inverse quantization process). For example, the decoding device determines whether to use scaling list data based on the first available flag obtained from the SPS included in the image information and/or the second available flag information obtained from the header information included in the image information. I can. If it is determined to use the scaling list data based on the first available flag and/or the second available flag information, the decoding device identifies the corresponding APS based on the APS identification information related to the scaling list data included in the header information. , Scaling list data may be obtained from the identified APS.
- the decoding apparatus may derive residual samples based on the transform coefficients (S830).
- the decoding apparatus may derive residual samples of the current block by performing inverse transformation on transform coefficients for the current block.
- the decoding apparatus may obtain information indicating whether to apply the inverse transform to the current block (ie, transform skip flag information), and derive residual samples based on this information (ie, transform skip flag information). .
- the decoding device may derive transform coefficients as residual samples of the current block.
- the decoding apparatus may inverse transform the transform coefficients to derive residual samples of the current block.
- the decoding apparatus may generate reconstructed samples based on the residual samples (S840).
- the decoding apparatus may determine whether to perform inter prediction or intra prediction for the current block based on prediction information (eg, prediction mode information) included in the image information, and according to the determination Prediction may be performed to derive prediction samples for the current block.
- Prediction may be performed to derive prediction samples for the current block.
- the decoding apparatus may generate reconstructed samples based on the prediction samples and the residual samples.
- the decoding apparatus may directly use the prediction samples as reconstructed samples according to the prediction mode, or may generate reconstructed samples by adding residual samples to the prediction samples.
- a reconstructed block or a reconstructed picture may be derived based on the reconstructed samples.
- the decoding apparatus may apply an in-loop filtering procedure such as deblocking filtering and/or SAO procedure to the reconstructed picture in order to improve subjective/objective image quality as needed.
- the above-described method according to this document may be implemented in a software form, and the encoding device and/or decoding device according to this document performs image processing such as a TV, computer, smartphone, set-top box, display device, etc. Can be included in the device.
- the above-described method may be implemented as a module (process, function, etc.) performing the above-described functions.
- the modules are stored in memory and can be executed by the processor.
- the memory may be inside or outside the processor, and may be connected to the processor by various well-known means.
- the processor may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and/or a data processing device.
- 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 this document may be implemented and performed on a processor, microprocessor, controller, or chip.
- the functional units illustrated in each drawing may be implemented and executed on a computer, processor, microprocessor, controller, or chip. In this case, information for implementation (ex. information on instructions) or an algorithm may be stored in a digital storage medium.
- decoding devices and encoding devices to which this document is applied include multimedia broadcasting transmission/reception devices, mobile communication terminals, home cinema video devices, digital cinema video devices, surveillance cameras, video chat devices, real-time communication devices such as video communications, and mobile streaming.
- Devices storage media, camcorders, video-on-demand (VoD) service providers, OTT video (Over the top video) devices, Internet streaming service providers, three-dimensional (3D) video devices, virtual reality (VR) devices, AR (argumente) reality) devices, video telephony video devices, transportation means terminals (ex.vehicle (including autonomous vehicles) terminals, airplane terminals, ship terminals, etc.) and medical video devices, and can be used to process video signals or data signals.
- an OTT video (Over the top video) device may include a game console, a Blu-ray player, an Internet-connected TV, a home theater system, a smartphone, a tablet PC, and a digital video recorder (DVR).
- DVR digital video recorder
- the processing method to which the embodiment(s) of this document is applied may be produced in the form of a program executed by a computer, and may be stored in a computer-readable recording medium.
- Multimedia data having a data structure according to the embodiment(s) of this document may 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 includes, for example, Blu-ray disk (BD), universal serial bus (USB), ROM, PROM, EPROM, EEPROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical It may include a data storage device.
- the computer-readable recording medium includes media implemented in the form of a carrier wave (for example, transmission through 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.
- embodiment(s) of this document may be implemented as a computer program product by program code, and the program code may be executed in a computer according to the embodiment(s) of this document.
- the program code may be stored on a carrier readable by a computer.
- FIG 9 shows an example of a content streaming system to which embodiments disclosed in this document can be applied.
- a content streaming system applied to embodiments of the present document may largely include an encoding server, a streaming server, a web server, a media storage device, a user device, and a multimedia input device.
- the encoding server serves to generate a bitstream by compressing content input from multimedia input devices such as smartphones, cameras, camcorders, etc. into digital data, and transmits it to the streaming server.
- multimedia input devices such as smartphones, cameras, camcorders, etc. directly generate bitstreams
- the encoding server may be omitted.
- the bitstream may be generated by an encoding method or a bitstream generation method applied to the embodiments of the present document, and the streaming server may temporarily store the bitstream while transmitting or receiving the bitstream. .
- the streaming server transmits multimedia data to a user device based on a user request through a web server, and the web server serves as an intermediary for notifying the user of a service.
- the web server transmits it to the streaming server, and the streaming server transmits multimedia data to the user.
- the content streaming system may include a separate control server, and in this case, the control server serves to control commands/responses between devices in the content streaming system.
- the streaming server may receive content from a media storage and/or encoding server. For example, when 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), a navigation system, a slate PC, and Tablet PC, ultrabook, wearable device, for example, smartwatch, smart glass, head mounted display (HMD)), digital TV, desktop There may be computers, digital signage, etc.
- PDA personal digital assistant
- PMP portable multimedia player
- HMD head mounted display
- TV desktop
- desktop There may be computers, digital signage, etc.
- Each server in the content streaming system may be operated as a distributed server, and in this case, data received from each server may be distributedly processed.
- the claims set forth in this document may be combined in a variety of ways.
- the technical features of the method claims of this document may be combined to be implemented as a device, and the technical features of the device claims of this document may be combined to be implemented as a method.
- the technical features of the method claim of this document and the technical features of the device claim may be combined to be implemented as a device, and the technical features of the method claim of this document and the technical features of the device claim may be combined to be implemented by a method.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
Description
Claims (16)
- 디코딩 장치에 의하여 수행되는 영상 디코딩 방법에 있어서,비트스트림으로부터 레지듀얼 정보를 포함하는 영상 정보를 획득하는 단계;상기 레지듀얼 정보를 기반으로 현재 블록에 대한 양자화된 변환 계수들을 도출하는 단계;상기 양자화된 변환 계수들을 기반으로 변환 계수들을 도출하는 단계;상기 변환 계수들을 기반으로 레지듀얼 샘플들을 도출하는 단계; 및상기 레지듀얼 샘플들을 기반으로 복원 샘플들을 생성하는 단계를 포함하며,상기 영상 정보는 APS(adaptation parameter set)를 포함하고,상기 APS는 APS 식별 정보 및 APS 파라미터들의 타입 정보를 포함하고,상기 타입 정보를 기반으로 상기 APS는 스케일링 리스트 데이터를 포함하고,상기 스케일링 리스트 데이터는 상기 양자화된 변환 계수들에 대한 역양자화 과정에서 사용되는 스케일링 리스트 파라미터들을 포함하고,상기 변환 계수들을 도출하는 단계는,상기 APS에 포함된 상기 타입 정보를 기반으로 상기 스케일링 리스트 데이터를 획득하는 단계; 및상기 스케일링 리스트 데이터를 기반으로 상기 양자화된 변환 계수들에 대한 상기 역양자화 과정을 적용하여 상기 변환 계수들을 도출하는 단계를 포함하는 것을 특징으로 하는 영상 디코딩 방법.
- 제1항에 있어서,상기 영상 정보는 헤더 정보를 포함하고,상기 헤더 정보는 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 포함하고,상기 헤더 정보의 ASP 식별 정보를 기반으로 상기 ASP를 식별하여, 상기 APS로부터 상기 스케일링 리스트 데이터를 획득하는 것을 특징으로 하는 영상 디코딩 방법.
- 제2항에 있어서,상기 헤더 정보는 픽처 헤더 또는 슬라이스 헤더를 포함하는 것을 특징으로 하는 영상 디코딩 방법.
- 제2항에 있어서,상기 영상 정보는 SPS(Sequence Parameter Set)를 포함하고,상기 SPS는 상기 스케일링 리스트 데이터의 가용 여부를 나타내는 제1 가용 플래그 정보를 포함하고,상기 스케일링 리스트 데이터가 가용함을 나타내는 상기 제1 가용 플래그 정보를 기반으로, 상기 헤더 정보로부터 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 획득하는 것을 특징으로 하는 영상 디코딩 방법.
- 제4항에 있어서,상기 헤더 정보는 픽처 또는 슬라이스에서의 상기 스케일링 리스트 데이터의 가용 여부를 나타내는 제2 가용 플래그 정보를 포함하고,상기 제1 가용 플래그 정보를 기반으로, 상기 헤더 정보로부터 상기 제2 가용 플래그 정보를 획득하고,상기 제2 가용 플래그 정보를 기반으로, 상기 헤더 정보로부터 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 획득하는 것을 특징으로 하는 영상 디코딩 방법.
- 제4항에 있어서,상기 영상 정보는 상기 제1 가용 플래그 정보의 사용에 관한 제한 플래그 정보를 포함하고,상기 제한 플래그 정보의 값이 1인 것을 기반으로, 상기 제1 가용 플래그 정보의 값이 0으로 설정되는 것을 특징으로 하는 영상 디코딩 방법.
- 제1항에 있어서,상기 영상 정보는 상기 현재 블록을 포함하는 슬라이스에 관련된 헤더 정보를 포함하고,상기 헤더 정보는 상기 스케일링 리스트 데이터 관련 APS 식별 정보의 개수를 나타내는 APS 개수 정보를 포함하되, 상기 APS 개수 정보를 기반으로 도출되는 개수만큼의 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 포함하는 것을 특징으로 하는 영상 디코딩 방법.
- 제1항에 있어서,상기 역양자화 과정을 적용하여 상기 변환 계수들을 도출하는 단계는,상기 스케일링 리스트 데이터를 기반으로 스케일링 매트릭스를 도출하는 단계;상기 스케일링 매트릭스를 기반으로 스케일링 팩터를 도출하는 단계; 및상기 스케일링 팩터를 기반으로 상기 역양자화를 적용하여 상기 변환 계수들을 도출하는 단계를 포함하는 것을 특징으로 하는 영상 디코딩 방법.
- 인코딩 장치에 의하여 수행되는 영상 인코딩 방법에 있어서,현재 블록에 대한 레지듀얼 샘플들을 도출하는 단계;상기 레지듀얼 샘플들을 기반으로 변환 계수들을 도출하는 단계;상기 변환 계수들에 대한 양자화 과정을 적용하여 양자화된 변환 계수들을 도출하는 단계;상기 양자화된 변환 계수들에 대한 정보를 포함하는 레지듀얼 정보를 생성하는 단계; 및상기 레지듀얼 정보를 포함하는 영상 정보를 인코딩하는 단계를 포함하며,상기 영상 정보는 APS(adaptation parameter set)를 포함하고,상기 APS는 스케일링 리스트 파라미터들을 포함하는 스케일링 리스트 데이터를 포함하고,상기 APS는 APS 식별 정보 및 APS 파라미터들의 타입 정보를 포함하고,상기 타입 정보를 기반으로 상기 APS는 상기 스케일링 리스트 데이터를 포함하는 것을 특징으로 하는 영상 인코딩 방법.
- 제9항에 있어서,상기 영상 정보는 헤더 정보를 포함하고,상기 헤더 정보는 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 포함하고,상기 헤더 정보의 ASP 식별 정보는 상기 스케일링 리스트 데이터를 포함하는 상기 APS의 식별 정보를 명시하는 것을 특징으로 하는 영상 인코딩 방법.
- 제10항에 있어서,상기 헤더 정보는 픽처 헤더 또는 슬라이스 헤더를 포함하는 것을 특징으로 하는 영상 인코딩 방법.
- 제10항에 있어서,상기 영상 정보는 SPS(Sequence Parameter Set)를 포함하고,상기 SPS는 상기 스케일링 리스트 데이터의 가용 여부를 나타내는 제1 가용 플래그 정보를 포함하고,상기 스케일링 리스트 데이터가 가용함을 나타내는 상기 제1 가용 플래그 정보를 기반으로, 상기 헤더 정보는 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 포함하는 것을 특징으로 하는 영상 인코딩 방법.
- 제12항에 있어서,상기 헤더 정보는 픽처 또는 슬라이스에서의 상기 스케일링 리스트 데이터의 가용 여부를 나타내는 제2 가용 플래그 정보를 포함하고,상기 제1 가용 플래그 정보를 기반으로, 상기 헤더 정보는 상기 제2 가용 플래그 정보를 포함하고,상기 제2 가용 플래그 정보를 기반으로, 상기 헤더 정보는 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 포함하는 것을 특징으로 하는 영상 인코딩 방법.
- 제12항에 있어서,상기 영상 정보는 상기 제1 가용 플래그 정보의 사용에 관한 제한 플래그 정보를 포함하고,상기 제한 플래그 정보의 값이 1인 것을 기반으로, 상기 제1 가용 플래그 정보의 값이 0으로 설정되는 것을 특징으로 하는 영상 인코딩 방법.
- 제9항에 있어서,상기 영상 정보는 상기 현재 블록을 포함하는 슬라이스에 관련된 헤더 정보를 포함하고,상기 헤더 정보는 상기 스케일링 리스트 데이터 관련 APS 식별 정보의 개수를 나타내는 APS 개수 정보를 포함하되, 상기 APS 개수 정보를 기반으로 도출되는 개수만큼의 상기 스케일링 리스트 데이터 관련 APS 식별 정보를 포함하는 것을 특징으로 하는 영상 인코딩 방법.
- 영상 디코딩 장치가 영상 디코딩 방법을 수행하도록 야기하는 인코딩된 정보를 저장하는 컴퓨터 판독 가능한 저장 매체에 있어서,상기 영상 디코딩 방법은,비트스트림으로부터 레지듀얼 정보를 포함하는 영상 정보를 획득하는 단계;상기 레지듀얼 정보를 기반으로 현재 블록에 대한 양자화된 변환 계수들을 도출하는 단계;상기 양자화된 변환 계수들을 기반으로 변환 계수들을 도출하는 단계;상기 변환 계수들을 기반으로 레지듀얼 샘플들을 도출하는 단계; 및상기 레지듀얼 샘플들을 기반으로 복원 샘플들을 생성하는 단계를 포함하며,상기 영상 정보는 APS(adaptation parameter set)를 포함하고,상기 APS는 APS 식별 정보 및 APS 파라미터들의 타입 정보를 포함하고,상기 타입 정보를 기반으로 상기 APS는 스케일링 리스트 데이터를 포함하고,상기 스케일링 리스트 데이터는 상기 양자화된 변환 계수들에 대한 역양자화 과정에서 사용되는 스케일링 리스트 파라미터들을 포함하고,상기 변환 계수들을 도출하는 단계는,상기 APS에 포함된 상기 타입 정보를 기반으로 상기 스케일링 리스트 데이터를 획득하는 단계; 및상기 스케일링 리스트 데이터를 기반으로 상기 양자화된 변환 계수들에 대한 상기 역양자화 과정을 적용하여 상기 변환 계수들을 도출하는 단계를 포함하는 것을 특징으로 하는 컴퓨터 판독 가능한 저장 매체.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20791134.8A EP3958568A4 (en) | 2019-04-15 | 2020-04-07 | VIDEO OR IMAGE ENCODING BASED ON SIGNALING SCALING LIST DATA |
US17/598,123 US20220159279A1 (en) | 2019-04-15 | 2020-04-07 | Video or image coding based on signaling of scaling list data |
JP2021561761A JP7314307B2 (ja) | 2019-04-15 | 2020-04-07 | スケーリングリストデータのシグナリングベースのビデオまたは映像コーディング |
CN202080028623.3A CN113711606A (zh) | 2019-04-15 | 2020-04-07 | 基于缩放列表数据的信令的视频或图像编译 |
KR1020217030257A KR20210122863A (ko) | 2019-04-15 | 2020-04-07 | 스케일링 리스트 데이터의 시그널링 기반 비디오 또는 영상 코딩 |
JP2023114481A JP2023126404A (ja) | 2019-04-15 | 2023-07-12 | スケーリングリストデータのシグナリングベースのビデオまたは映像コーディング |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201962834375P | 2019-04-15 | 2019-04-15 | |
US62/834,375 | 2019-04-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020213867A1 true WO2020213867A1 (ko) | 2020-10-22 |
Family
ID=72838307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2020/004693 WO2020213867A1 (ko) | 2019-04-15 | 2020-04-07 | 스케일링 리스트 데이터의 시그널링 기반 비디오 또는 영상 코딩 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220159279A1 (ko) |
EP (1) | EP3958568A4 (ko) |
JP (2) | JP7314307B2 (ko) |
KR (1) | KR20210122863A (ko) |
CN (1) | CN113711606A (ko) |
WO (1) | WO2020213867A1 (ko) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020213866A1 (ko) * | 2019-04-15 | 2020-10-22 | 엘지전자 주식회사 | 스케일링 리스트 파라미터 기반 비디오 또는 영상 코딩 |
MX2021014726A (es) * | 2019-06-14 | 2022-01-18 | Electronics & Telecommunications Res Inst | Metodo y dispositivo de codificacion/decodificacion de matrices de cuantificacion, y medio de grabacion que almacena un flujo de bits. |
TW202143716A (zh) * | 2020-04-14 | 2021-11-16 | 法商內數位Vc控股法國公司 | 對可適性色彩轉換及色度聯合編碼之尺度清單控制 |
EP4140131A1 (en) * | 2020-04-30 | 2023-03-01 | HFI Innovation Inc. | Method and apparatus for imposing bitstream constraints in video coding |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013034161A (ja) * | 2011-06-28 | 2013-02-14 | Sharp Corp | 画像復号装置、画像符号化装置、および符号化データのデータ構造 |
WO2013113997A1 (en) * | 2012-02-01 | 2013-08-08 | Nokia Corporation | Method and apparatus for video coding |
KR20140120342A (ko) * | 2012-01-19 | 2014-10-13 | 퀄컴 인코포레이티드 | 비디오 코딩에서 블록화제거 필터 파라미터들의 시그널링 |
KR20140136428A (ko) * | 2012-02-29 | 2014-11-28 | 엘지전자 주식회사 | 인터 레이어 예측 방법 및 이를 이용하는 장치 |
KR20180078212A (ko) * | 2012-01-20 | 2018-07-09 | 한국전자통신연구원 | 양자화 행렬의 부호화 방법 및 복호화 방법과 이를 이용하는 장치 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10070140B2 (en) * | 2013-04-08 | 2018-09-04 | Hfi Innovation Inc. | Method and apparatus for quantization matrix signaling and representation in scalable video coding |
KR102390298B1 (ko) * | 2016-07-04 | 2022-04-25 | 소니그룹주식회사 | 화상 처리 장치 및 방법 |
US11272175B2 (en) * | 2016-10-05 | 2022-03-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Deringing filter for video coding |
WO2018117938A1 (en) * | 2016-12-23 | 2018-06-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Deringing filter for video coding |
US10595048B1 (en) * | 2018-09-13 | 2020-03-17 | Tencent America LLC | Method and device using high layer syntax architecture for coding and decoding |
KR20200080187A (ko) * | 2018-12-26 | 2020-07-06 | 한국전자통신연구원 | 양자화 행렬 부호화/복호화 방법, 장치 및 비트스트림을 저장한 기록 매체 |
CN114365497A (zh) * | 2019-07-08 | 2022-04-15 | Lg电子株式会社 | 基于缩放列表参数的视频或图像编码 |
US11418814B2 (en) * | 2020-05-22 | 2022-08-16 | Tencent America LLC | Constraint on syntax elements for still picture profiles |
-
2020
- 2020-04-07 KR KR1020217030257A patent/KR20210122863A/ko not_active Application Discontinuation
- 2020-04-07 US US17/598,123 patent/US20220159279A1/en active Pending
- 2020-04-07 JP JP2021561761A patent/JP7314307B2/ja active Active
- 2020-04-07 CN CN202080028623.3A patent/CN113711606A/zh active Pending
- 2020-04-07 EP EP20791134.8A patent/EP3958568A4/en active Pending
- 2020-04-07 WO PCT/KR2020/004693 patent/WO2020213867A1/ko unknown
-
2023
- 2023-07-12 JP JP2023114481A patent/JP2023126404A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013034161A (ja) * | 2011-06-28 | 2013-02-14 | Sharp Corp | 画像復号装置、画像符号化装置、および符号化データのデータ構造 |
KR20140120342A (ko) * | 2012-01-19 | 2014-10-13 | 퀄컴 인코포레이티드 | 비디오 코딩에서 블록화제거 필터 파라미터들의 시그널링 |
KR20180078212A (ko) * | 2012-01-20 | 2018-07-09 | 한국전자통신연구원 | 양자화 행렬의 부호화 방법 및 복호화 방법과 이를 이용하는 장치 |
WO2013113997A1 (en) * | 2012-02-01 | 2013-08-08 | Nokia Corporation | Method and apparatus for video coding |
KR20140136428A (ko) * | 2012-02-29 | 2014-11-28 | 엘지전자 주식회사 | 인터 레이어 예측 방법 및 이를 이용하는 장치 |
Also Published As
Publication number | Publication date |
---|---|
JP2022529461A (ja) | 2022-06-22 |
EP3958568A1 (en) | 2022-02-23 |
US20220159279A1 (en) | 2022-05-19 |
CN113711606A (zh) | 2021-11-26 |
JP2023126404A (ja) | 2023-09-07 |
EP3958568A4 (en) | 2023-01-11 |
KR20210122863A (ko) | 2021-10-12 |
JP7314307B2 (ja) | 2023-07-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2021040481A1 (ko) | 크로스 컴포넌트 필터링 기반 영상 코딩 장치 및 방법 | |
WO2021040480A1 (ko) | 인루프 필터링 기반 영상 코딩 장치 및 방법 | |
WO2021040484A1 (ko) | 크로스-컴포넌트 적응적 루프 필터링 기반 영상 코딩 장치 및 방법 | |
WO2021040479A1 (ko) | 필터링 기반 영상 코딩 장치 및 방법 | |
WO2020231140A1 (ko) | 적응적 루프 필터 기반 비디오 또는 영상 코딩 | |
WO2020213867A1 (ko) | 스케일링 리스트 데이터의 시그널링 기반 비디오 또는 영상 코딩 | |
WO2020204413A1 (ko) | 복원 픽처를 수정하는 비디오 또는 영상 코딩 | |
WO2021040483A1 (ko) | 영상 코딩 장치 및 방법 | |
WO2021006632A1 (ko) | 스케일링 리스트 파라미터 기반 비디오 또는 영상 코딩 | |
WO2020180143A1 (ko) | 루마 맵핑 및 크로마 스케일링 기반 비디오 또는 영상 코딩 | |
WO2021101205A1 (ko) | 영상 코딩 장치 및 방법 | |
WO2020204419A1 (ko) | 적응적 루프 필터 기반 비디오 또는 영상 코딩 | |
WO2021101203A1 (ko) | 필터링 기반 영상 코딩 장치 및 방법 | |
WO2020231139A1 (ko) | 루마 맵핑 및 크로마 스케일링 기반 비디오 또는 영상 코딩 | |
WO2021101201A1 (ko) | 루프 필터링을 제어하는 영상 코딩 장치 및 방법 | |
WO2021101200A1 (ko) | 루프 필터링을 제어하기 위한 영상 코딩 장치 및 방법 | |
WO2021141226A1 (ko) | 루마 성분 및 크로마 성분에 대한 bdpcm 기반 영상 디코딩 방법 및 그 장치 | |
WO2021040482A1 (ko) | 적응적 루프 필터링 기반 영상 코딩 장치 및 방법 | |
WO2020180122A1 (ko) | 조건적으로 파싱되는 alf 모델 및 리셰이핑 모델 기반 비디오 또는 영상 코딩 | |
WO2021145669A1 (ko) | 영상/비디오 코딩 시스템에서 인터 예측 방법 및 장치 | |
WO2020213866A1 (ko) | 스케일링 리스트 파라미터 기반 비디오 또는 영상 코딩 | |
WO2021006630A1 (ko) | 스케일링 리스트 데이터 기반 영상 또는 비디오 코딩 | |
WO2021006631A1 (ko) | 스케일링 리스트 데이터의 시그널링 기반 비디오 또는 영상 코딩 | |
WO2020184928A1 (ko) | 루마 맵핑 및 크로마 스케일링 기반 비디오 또는 영상 코딩 | |
WO2021006700A1 (ko) | 영상 코딩 시스템에서 레지듀얼 코딩 방법에 대한 플래그를 사용하는 영상 디코딩 방법 및 그 장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20791134 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20217030257 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2021561761 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2020791134 Country of ref document: EP Effective date: 20211115 |