WO2021194155A1 - 경계 강도를 결정하여 디블록킹 필터링을 수행하는 영상 부호화/복호화 방법, 장치 및 비트스트림을 전송하는 방법 - Google Patents
경계 강도를 결정하여 디블록킹 필터링을 수행하는 영상 부호화/복호화 방법, 장치 및 비트스트림을 전송하는 방법 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/186—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 colour or a chrominance component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/117—Filters, e.g. for pre-processing or post-processing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/184—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 bits, e.g. of the compressed video stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/46—Embedding additional information in the video signal during the compression process
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/70—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
- H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/86—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness
Definitions
- the present disclosure relates to a method and apparatus for encoding/decoding an image, and more particularly, an image encoding/decoding method and apparatus for performing deblocking filtering by determining boundary strength, and an image encoding method/device of the present disclosure. It relates to a method of transmitting a bitstream.
- HD images high definition (HD) images and ultra high definition (UHD) images
- UHD images ultra high definition
- An object of the present disclosure is to provide an image encoding/decoding method and apparatus with improved encoding/decoding efficiency.
- Another object of the present disclosure is to provide a method and apparatus for encoding/decoding an image performing deblocking filtering.
- Another object of the present disclosure is to provide a method and apparatus for encoding/decoding an image for determining a boundary strength of deblocking filtering in order to perform deblocking filtering.
- Another object of the present disclosure is to provide a method of transmitting a bitstream generated by an image encoding method or apparatus according to the present disclosure.
- Another object of the present disclosure is to provide a recording medium storing a bitstream generated by an image encoding method or apparatus according to the present disclosure.
- Another object of the present disclosure is to provide a recording medium storing a bitstream that is received and decoded by an image decoding apparatus according to the present disclosure and used to restore an image.
- An image decoding method includes obtaining a reconstructed picture, determining a target boundary of deblocking filtering in the reconstructed picture, determining a boundary strength with respect to the target boundary, and applying deblocking filtering to the target boundary based on the boundary strength, wherein when the target boundary is a transform block boundary and a color component of the reconstructed picture is a chroma component, the boundary strength is applied to the target boundary It is determined based on whether or not joint CbCr residual coding is performed on at least one of two adjacent blocks, wherein the joint CbCr residual coding is to encode residual samples for a chroma Cb component and a chroma Cr component into a single transform block. may be applicable.
- whether joint CbCr residual encoding is performed on a block adjacent to the target boundary may be determined based on a first flag signaled to the adjacent block.
- the boundary strength is 0 when at least one of two blocks adjacent to the target boundary is 0 It may be further determined based on whether or not the transform coefficient level is included.
- whether at least one block adjacent to the target boundary includes a non-zero transform coefficient level may be determined based on a second flag signaled to the adjacent block.
- the boundary strength is two first two blocks adjacent to the target boundary. It may be determined based on the sum of the flag and the two second flags.
- the boundary strength when the sum is greater than 0, the boundary strength may be determined to be 1.
- the boundary strength is 0 when at least one of two blocks adjacent to the target boundary is 0 It may be determined based on whether or not the transform coefficient level is included.
- An image decoding apparatus includes a memory and at least one processor, wherein the at least one processor acquires a reconstructed picture, and determines a target boundary of deblocking filtering in the reconstructed picture and determining a boundary strength for the target boundary, and applying deblocking filtering to the target boundary based on the boundary strength, wherein the target boundary is a transform block boundary, and a color component of the reconstructed picture is
- the boundary strength is determined based on whether joint CbCr residual encoding is performed on at least one of the two blocks adjacent to the target boundary, and the joint CbCr residual encoding includes a chroma Cb component and a chroma Cr It may correspond to encoding residual samples for a component into a single transform block.
- An image encoding method includes generating a reconstructed picture, determining a target boundary of deblocking filtering in the reconstructed picture, and determining a boundary strength with respect to the target boundary and applying deblocking filtering to the target boundary based on the boundary strength, wherein when the target boundary is a transform block boundary and a color component of the reconstructed picture is a chroma component, the boundary strength is the target boundary It is determined based on whether joint CbCr residual encoding is performed on at least one of two blocks adjacent to may pertain to
- whether joint CbCr residual encoding is performed on a block adjacent to the target boundary may be determined based on a first flag signaled for the adjacent block.
- the boundary strength is 0 when at least one of two blocks adjacent to the target boundary is 0. It may be further determined based on whether or not the transform coefficient level is included.
- whether at least one block adjacent to the target boundary includes a non-zero transform coefficient level may be determined based on a second flag signaled to the adjacent block.
- the boundary strength is the first two blocks for two blocks adjacent to the target boundary. It may be determined based on the sum of the flag and the two second flags.
- the boundary strength when the sum is greater than 0, the boundary strength may be determined to be 1.
- a transmission method may transmit a bitstream generated by the image encoding apparatus or the image encoding method of the present disclosure.
- a computer-readable recording medium may store a bitstream generated by the image encoding method or image encoding apparatus of the present disclosure.
- an image encoding/decoding method and apparatus having improved encoding/decoding efficiency may be provided.
- a method and apparatus for encoding/decoding an image performing deblocking filtering may be provided.
- a method and apparatus for encoding/decoding an image for determining a boundary strength of deblocking filtering to perform deblocking filtering may be provided.
- a method for transmitting a bitstream generated by an image encoding method or apparatus according to the present disclosure may be provided.
- a recording medium storing a bitstream generated by the image encoding method or apparatus according to the present disclosure may be provided.
- a recording medium storing a bitstream received and decoded by the image decoding apparatus according to the present disclosure and used to restore an image.
- FIG. 1 is a diagram schematically illustrating a video coding system according to an embodiment of the present disclosure.
- FIG. 2 is a diagram schematically illustrating an image encoding apparatus according to an embodiment of the present disclosure.
- FIG. 3 is a diagram schematically illustrating an image decoding apparatus according to an embodiment of the present disclosure.
- FIG. 4 is a schematic flowchart of an image decoding procedure to which an embodiment according to the present disclosure is applicable.
- FIG. 5 is a schematic flowchart of an image encoding procedure to which an embodiment according to the present disclosure is applicable.
- FIG. 6 is a flowchart illustrating deblocking filtering according to the present disclosure.
- FIG. 7 is a flowchart illustrating a method of determining a boundary strength for a target boundary according to an embodiment of the present disclosure.
- FIG. 8 is a diagram for explaining signaling of a syntax element in a transform block related to an embodiment of the present disclosure.
- FIG. 9 is a flowchart illustrating a method of determining a boundary strength for a target boundary according to another embodiment of the present disclosure.
- FIG. 10 is a flowchart illustrating a method of determining boundary strength strength for a target boundary according to another embodiment of the present disclosure.
- 11 is a flowchart illustrating a method of determining boundary strength strength for a target boundary according to another embodiment of the present disclosure.
- FIG. 12 is a flowchart illustrating an encoding process based on deblocking filtering according to the present disclosure.
- FIG. 13 is a flowchart illustrating a decoding process based on deblocking filtering according to the present disclosure.
- FIG. 14 is a diagram illustrating two blocks and samples adjacent to a target boundary of deblocking filtering according to an embodiment of the present disclosure.
- 15 is a diagram illustrating a content streaming system to which an embodiment of the present disclosure can be applied.
- a component when it is said that a component is “connected”, “coupled” or “connected” with another component, it is not only a direct connection relationship, but also an indirect connection relationship in which another component exists in the middle. may also include.
- a component when a component is said to "include” or “have” another component, it means that another component may be further included without excluding other components unless otherwise stated. .
- first, second, etc. are used only for the purpose of distinguishing one component from another, and do not limit the order or importance between the components unless otherwise specified. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment is referred to as a first component in another embodiment. can also be called
- components that are distinguished from each other are for clearly explaining each characteristic, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form one hardware or software unit, or one component may be distributed to form a plurality of hardware or software units. Accordingly, even if not specifically mentioned, such integrated or dispersed embodiments are also included in the scope of the present disclosure.
- components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment composed of a subset of components described in one embodiment is also included in the scope of the present disclosure. In addition, embodiments including other components in addition to components described in various embodiments are also included in the scope of the present disclosure.
- the present disclosure relates to encoding and decoding of an image, and terms used in the present disclosure may have conventional meanings commonly used in the technical field to which the present disclosure belongs unless they are newly defined in the present disclosure.
- a “picture” generally refers to a unit representing one image in a specific time period, and a slice/tile/subpicture is a coding unit constituting a part of a picture.
- one picture may be composed of one or more slices/tiles/subpictures.
- a slice/tile/subpicture may include one or more coding tree units (CTUs).
- pixel or “pel” may mean a minimum unit constituting one picture (or image).
- sample may be used as a term corresponding to a pixel.
- the 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.
- a “unit” may indicate a basic unit of image processing.
- the unit may include at least one of a specific region of a picture and information related to the region.
- the unit may be used interchangeably with terms such as “sample array”, “block” or “area” in some cases.
- the MxN block may include samples (or sample arrays) or a set (or arrays) of transform coefficients including M columns and N rows.
- “current block” may mean one of “current coding block”, “current coding unit”, “coding object block”, “decoding object block”, or “processing object block”.
- “current block” may mean “current prediction block” or “prediction target block”.
- transform inverse transform
- quantization inverse quantization
- “current block” may mean “current transform block” or “transform target block”.
- filtering the “current block” may mean a “filtering target block”.
- the “current block” may mean “the luma block of the current block” unless there is an explicit description of the chroma block.
- the “chroma block of the current block” may be expressed by explicitly including an explicit description of the chroma block, such as “chroma block” or “current chroma block”.
- “/” and “,” may be interpreted as “and/or”.
- “A/B” and “A, B” may be interpreted as “A and/or B”.
- “A/B/C” and “A, B, and C” may mean “at least one of A, B and/or C”.
- “or” may be construed as “and/or”.
- a or B may mean 1) only “A”, 2) only “B”, or 3) “A and B”.
- “or” may mean “additionally or alternatively”.
- FIG. 1 illustrates a video coding system according to this disclosure.
- a video coding system may include an encoding apparatus 10 and a decoding apparatus 20 .
- the encoding apparatus 10 may transmit encoded video and/or image information or data in the form of a file or streaming to the decoding apparatus 20 through a digital storage medium or a network.
- the encoding apparatus 10 may include a video source generator 11 , an encoder 12 , and a transmitter 13 .
- the decoding apparatus 20 may include a receiving unit 21 , a decoding unit 22 , and a rendering unit 23 .
- the encoder 12 may be referred to as a video/image encoder, and the decoder 22 may be referred to as a video/image decoder.
- the transmitter 13 may be included in the encoder 12 .
- the receiver 21 may be included in the decoder 22 .
- the rendering unit 23 may include a display unit, and the display unit may be configured as a separate device or external component.
- the video source generator 11 may acquire a video/image through a process of capturing, synthesizing, or generating the video/image.
- the video source generating unit 11 may include a video/image capturing device and/or a video/image generating device.
- a video/image capture device may include, for example, one or more cameras, a video/image archive containing previously captured video/images, and the like.
- a video/image generating device may include, for example, a computer, tablet, and smart phone, and may (electronically) generate a video/image.
- a virtual video/image may be generated through a computer, etc. In this case, the video/image capturing process may be substituted for the process of generating related data.
- the encoder 12 may encode an input video/image.
- the encoder 12 may perform a series of procedures such as prediction, transformation, and quantization for compression and encoding efficiency.
- the encoder 12 may output encoded data (encoded video/image information) in the form of a bitstream.
- the transmitter 13 may transmit the encoded video/image information or data output in the form of a bitstream in the form of a file or streaming to the receiver 21 of the decoding apparatus 20 through a digital storage medium or a network.
- the digital storage medium may include various storage media such as USB, SD, CD, DVD, Blu-ray, HDD, and SSD.
- the transmission unit 13 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 21 may extract/receive the bitstream from the storage medium or the network and transmit it to the decoder 22 .
- the decoder 22 may decode the video/image by performing a series of procedures such as inverse quantization, inverse transform, and prediction corresponding to the operation of the encoder 12 .
- the rendering unit 23 may render the decoded video/image.
- the rendered video/image may be displayed through the display unit.
- FIG. 2 is a diagram schematically illustrating an image encoding apparatus to which an embodiment according to the present disclosure can be applied.
- the image encoding apparatus 100 includes an image segmentation unit 110 , a subtraction unit 115 , a transform unit 120 , a quantization unit 130 , an inverse quantization unit 140 , and an inverse transform unit ( 150 ), an adder 155 , a filtering unit 160 , a memory 170 , an inter prediction unit 180 , an intra prediction unit 185 , and an entropy encoding unit 190 .
- the inter prediction unit 180 and the intra prediction unit 185 may be collectively referred to as a “prediction unit”.
- the transform unit 120 , the quantization unit 130 , the inverse quantization unit 140 , and the inverse transform unit 150 may be included in a residual processing unit.
- the residual processing unit may further include a subtraction unit 115 .
- All or at least some of the plurality of components constituting the image encoding apparatus 100 may be implemented as one hardware component (eg, an encoder or a processor) according to an embodiment.
- the memory 170 may include a decoded picture buffer (DPB), and may be implemented by a digital storage medium.
- DPB decoded picture buffer
- the image dividing unit 110 may divide an input image (or a picture, a frame) input to the image encoding apparatus 100 into one or more processing units.
- the processing unit may be referred to as a coding unit (CU).
- Coding unit is a coding tree unit (coding tree unit, CTU) or largest coding unit (LCU) according to the QT / BT / TT (Quad-tree / binary-tree / ternary-tree) structure recursively ( can be obtained by recursively segmenting.
- one coding unit may be divided into a plurality of coding units having a lower depth based on a quad tree structure, a binary tree structure, and/or a ternary tree structure.
- a quad tree structure may be applied first and a binary tree structure and/or a ternary tree structure may be applied later.
- a coding procedure according to the present disclosure may be performed based on the last coding unit that is no longer divided.
- the largest coding unit may be directly used as the final coding unit, and a coding unit of a lower depth obtained by dividing the largest coding unit may be used as the final cornet unit.
- the coding procedure may include procedures such as prediction, transformation, and/or restoration, which will be described later.
- the processing unit of the coding procedure may be a prediction unit (PU) or a transform unit (TU).
- the prediction unit and the transform unit may be divided or partitioned from the final coding unit, respectively.
- the prediction unit may be a unit of sample prediction
- the transform unit may be a unit for deriving a transform coefficient and/or a unit for deriving a residual signal from the transform coefficient.
- the prediction unit (the inter prediction unit 180 or the intra prediction unit 185) performs prediction on a processing target block (current block), and generates a predicted block including prediction samples for the current block.
- the prediction unit may determine whether intra prediction or inter prediction is applied on a current block or CU basis.
- the prediction unit may generate various information regarding prediction of the current block and transmit it to the entropy encoding unit 190 .
- the prediction information may be encoded by the entropy encoding unit 190 and output in the form of a bitstream.
- the intra prediction unit 185 may predict the current block with reference to samples in the current picture.
- the referenced samples may be located in the vicinity of the current block according to an intra prediction mode and/or an intra prediction technique, or may be located apart from each other.
- the intra 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 the granularity of the prediction direction. However, this is an example, and a higher or lower number of directional prediction modes may be used according to a setting.
- the intra prediction unit 185 may determine the prediction mode applied to the current block by using the prediction mode applied to the neighboring block.
- the inter prediction unit 180 may derive the predicted block for the current block based on the reference block (reference sample array) specified by the motion vector on the reference picture.
- the motion information may be predicted in units of blocks, subblocks, or samples based on the correlation between motion information between neighboring blocks and the 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 blocks may include spatial neighboring blocks existing in the current picture and temporal neighboring blocks present 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 collocated CU (colCU), or the like.
- the reference picture including the temporal neighboring block may be referred to as a collocated picture (colPic).
- the inter prediction unit 180 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 create Inter prediction may be performed based on various prediction modes. For example, in the skip mode and merge mode, the inter prediction unit 180 may use motion information of a neighboring block as motion information of the current block. In the skip mode, unlike the merge mode, a residual signal may not be transmitted.
- a motion vector of a neighboring block is used as a motion vector predictor, and a motion vector difference and an indicator for the motion vector predictor ( indicator) to signal the motion vector of the current block.
- the motion vector difference may mean a difference between the motion vector of the current block and the motion vector predictor.
- the prediction unit may generate a prediction signal based on various prediction methods and/or prediction techniques to be described later. For example, the prediction unit may apply intra prediction or inter prediction for prediction of the current block, and may simultaneously apply intra prediction and inter prediction. A prediction method that simultaneously applies intra prediction and inter prediction for prediction of the current block may be referred to as combined inter and intra prediction (CIIP). Also, the prediction unit may perform intra block copy (IBC) for prediction of the current block. The intra block copy may be used for video/video coding of content such as games, for example, screen content coding (SCC). IBC is a method of predicting a current block using a reconstructed reference block in a current picture located a predetermined distance away from the current block.
- CIIP combined inter and intra prediction
- IBC intra block copy
- the intra block copy may be used for video/video coding of content such as games, for example, screen content coding (SCC).
- IBC is a method of predicting a current block using a reconstructed reference block in a current picture located
- the position of the reference block in the current picture may be encoded as a vector (block vector) corresponding to the predetermined distance.
- IBC basically performs prediction within the current picture, but may be performed similarly to inter prediction in that a reference block is derived within the current picture. That is, IBC may use at least one of the inter prediction techniques described in this disclosure.
- the prediction signal generated by the prediction unit may be used to generate a reconstructed signal or may be used to generate a residual signal.
- the subtraction unit 115 subtracts the prediction signal (predicted block, prediction sample array) output from the prediction unit from the input image signal (original block, original sample array) to obtain a residual signal (residual signal, residual block, and residual sample array). ) can be created.
- the generated residual signal may be transmitted to the converter 120 .
- the transform unit 120 may generate transform coefficients by applying a transform technique to the residual signal.
- the transformation method may include at least one of Discrete Cosine Transform (DCT), Discrete Sine Transform (DST), Karhunen-Loeve Transform (KLT), Graph-Based Transform (GBT), or Conditionally Non-linear Transform (CNT).
- DCT Discrete Cosine Transform
- DST Discrete Sine Transform
- KLT Karhunen-Loeve Transform
- GBT Graph-Based Transform
- CNT Conditionally Non-linear Transform
- GBT means a transformation obtained from this graph when expressing relationship information between pixels in a graph.
- CNT refers to a transformation obtained by generating a prediction signal using all previously reconstructed pixels and based thereon.
- the transformation process may be applied to a block of pixels having the same size as a square, or may be applied to a block of variable size that is not a square.
- the quantization unit 130 may quantize the transform coefficients and transmit them to the entropy encoding unit 190 .
- the entropy encoding unit 190 may encode a quantized signal (information on quantized transform coefficients) and output it as a bitstream.
- Information about the quantized transform coefficients may be referred to as residual information.
- the quantization unit 130 may rearrange the quantized transform coefficients in the block form into a one-dimensional vector form based on a coefficient scan order, and the quantized transform coefficients in the one-dimensional vector form are quantized based on the quantized transform coefficients in the one-dimensional vector form.
- Information about the transform coefficients may be generated.
- the entropy encoding unit 190 may perform various encoding methods such as, for example, exponential Golomb, context-adaptive variable length coding (CAVLC), and context-adaptive binary arithmetic coding (CABAC).
- the entropy encoding unit 190 may encode information necessary for video/image reconstruction (eg, values of syntax elements, etc.) other than the quantized transform coefficients together or separately.
- Encoded information eg, encoded video/image information
- NAL network abstraction layer
- the video/image information may further include information about 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). Also, the video/image information may further include general constraint information.
- APS adaptation parameter set
- PPS picture parameter set
- SPS sequence parameter set
- VPS video parameter set
- the video/image information may further include general constraint information.
- the signaling information, transmitted information, and/or syntax elements mentioned in this disclosure may be encoded through the above-described encoding procedure and included in the bitstream.
- the bitstream may be transmitted over 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 (not shown) and/or a storage unit (not shown) for storing the signal output from the entropy encoding unit 190 may be provided as internal/external elements of the image encoding apparatus 100 , or transmission The unit may be provided as a component of the entropy encoding unit 190 .
- the quantized transform coefficients output from the quantization unit 130 may be used to generate a residual signal.
- a residual signal residual block or residual samples
- a residual signal residual block or residual samples
- the adder 155 adds a reconstructed signal (reconstructed picture, reconstructed block, reconstructed sample array) by adding the reconstructed residual signal to the prediction signal output from the inter prediction unit 180 or the intra prediction unit 185 .
- a reconstructed signal (reconstructed picture, reconstructed block, reconstructed sample array) by adding the reconstructed residual signal to the prediction signal output from the inter prediction unit 180 or the intra prediction unit 185 .
- the adder 155 may be referred to as a restoration unit or a restoration block generator.
- the generated reconstructed signal may be used for intra prediction of the next processing object block in the current picture, or may be used for inter prediction of the next picture after filtering as described below.
- the filtering unit 160 may improve subjective/objective image quality by applying filtering to the reconstructed signal.
- the filtering unit 160 may generate a modified reconstructed picture by applying various filtering methods to the reconstructed picture, and store the modified reconstructed picture in the memory 170 , specifically, the DPB of the memory 170 .
- the various filtering methods may include, for example, deblocking filtering, a sample adaptive offset, an adaptive loop filter, a bilateral filter, and the like.
- the filtering unit 160 may generate various information regarding filtering and transmit it to the entropy encoding unit 190 as described later in the description of each filtering method.
- the filtering-related information may be encoded by the entropy encoding unit 190 and output in the form of a bitstream.
- the modified reconstructed picture transmitted to the memory 170 may be used as a reference picture in the inter prediction unit 180 .
- the image encoding apparatus 100 can avoid a prediction mismatch between the image encoding apparatus 100 and the image decoding apparatus, and can also improve encoding efficiency.
- the DPB in the memory 170 may store a reconstructed picture corrected for use as a reference picture in the inter prediction unit 180 .
- the memory 170 may store motion information of a block in which motion information in the current picture is derived (or encoded) and/or motion information of blocks in an already reconstructed picture.
- the stored motion information may be transmitted to the inter prediction unit 180 to be used as motion information of a spatial neighboring block or motion information of a temporal neighboring block.
- the memory 170 may store reconstructed samples of reconstructed blocks in the current picture, and may transmit the reconstructed samples to the intra prediction unit 185 .
- FIG. 3 is a diagram schematically illustrating an image decoding apparatus to which an embodiment according to the present disclosure can be applied.
- the image decoding apparatus 200 includes an entropy decoding unit 210 , an inverse quantization unit 220 , an inverse transform unit 230 , an adder 235 , a filtering unit 240 , and a memory 250 .
- the inter prediction unit 260 and the intra prediction unit 265 may be included.
- the inter prediction unit 260 and the intra prediction unit 265 may be collectively referred to as a “prediction unit”.
- the inverse quantization unit 220 and the inverse transform unit 230 may be included in the residual processing unit.
- All or at least some of the plurality of components constituting the image decoding apparatus 200 may be implemented as one hardware component (eg, a decoder or a processor) according to an embodiment.
- the memory 250 may include a DPB, and may be implemented by a digital storage medium.
- the image decoding apparatus 200 may reconstruct the image by performing a process corresponding to the process performed by the image encoding apparatus 100 of FIG. 2 .
- the image decoding apparatus 200 may perform decoding using a processing unit applied in the image encoding apparatus.
- the processing unit of decoding may be, for example, a coding unit.
- a coding unit may be a coding tree unit or may be obtained by dividing the largest coding unit.
- the reconstructed image signal decoded and output through the image decoding apparatus 200 may be reproduced through a reproducing apparatus (not shown).
- the image decoding apparatus 200 may receive the signal output from the image encoding apparatus of FIG. 2 in the form of a bitstream.
- the received signal may be decoded through the entropy decoding unit 210 .
- the entropy decoding unit 210 may parse the bitstream to derive information (eg, video/image information) required for image restoration (or picture restoration).
- the video/image information may further include information about 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/image information may further include general constraint information.
- the image decoding apparatus may additionally use the information about the parameter set and/or the general restriction information to decode the image.
- the signaling information, received information and/or syntax elements mentioned in this disclosure may be obtained from the bitstream by being decoded through the decoding procedure.
- the entropy decoding unit 210 decodes information in a bitstream based on a coding method such as exponential Golomb encoding, CAVLC or CABAC, and a value of a syntax element required for image reconstruction, and a quantized value of a transform coefficient related to a residual can be printed out.
- the CABAC entropy decoding method receives a bin corresponding to each syntax element in a bitstream, and receives syntax element information to be decoded and decoding information of neighboring blocks and blocks to be decoded or information of symbols/bins decoded in the previous step.
- the CABAC entropy decoding method may update the context model by using the decoded symbol/bin information for the context model of the next symbol/bin after determining the context model.
- Prediction-related information among the information decoded by the entropy decoding unit 210 is provided to the prediction unit (the inter prediction unit 260 and the intra prediction unit 265), and the entropy decoding unit 210 performs entropy decoding. Dual values, that is, quantized transform coefficients and related parameter information may be input to the inverse quantization unit 220 . Also, information on filtering among the information decoded by the entropy decoding unit 210 may be provided to the filtering unit 240 .
- a receiving unit for receiving a signal output from the image encoding apparatus may be additionally provided as an internal/external element of the image decoding apparatus 200 , or the receiving unit is provided as a component of the entropy decoding unit 210 . it might be
- the image decoding apparatus may be referred to as a video/image/picture decoding apparatus.
- the image decoding apparatus may include an information decoder (video/image/picture information decoder) and/or a sample decoder (video/image/picture sample decoder).
- the information decoder may include an entropy decoding unit 210, and the sample decoder includes an inverse quantizer 220, an inverse transform unit 230, an adder 235, a filtering unit 240, a memory 250, At least one of an inter prediction unit 260 and an intra prediction unit 265 may be included.
- the inverse quantizer 220 may inverse quantize the quantized transform coefficients to output transform coefficients.
- the inverse quantizer 220 may rearrange the quantized transform coefficients in a two-dimensional block form. In this case, the rearrangement may be performed based on a coefficient scan order performed by the image encoding apparatus.
- the inverse quantizer 220 may perform inverse quantization on the quantized transform coefficients using a quantization parameter (eg, quantization step size information) and obtain transform coefficients.
- a quantization parameter eg, quantization step size information
- the inverse transform unit 230 may inverse transform the transform coefficients to obtain a residual signal (residual block, residual sample array).
- 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 prediction information output from the entropy decoding unit 210, and determine a specific intra/inter prediction mode (prediction technique).
- the intra prediction unit 265 may predict the current block with reference to samples in the current picture.
- the description of the intra prediction unit 185 may be equally applied to the intra prediction unit 265 .
- the inter prediction unit 260 may derive the predicted block for the current block based on the reference block (reference sample array) specified by the motion vector on the reference picture.
- the motion information may be predicted in units of blocks, subblocks, or samples based on the correlation between motion information between neighboring blocks and the 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 blocks may include spatial neighboring blocks existing in the current picture and temporal neighboring blocks present in the reference picture.
- the inter prediction unit 260 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 (techniques), and the prediction information may include information indicating a mode (technique) of inter prediction for the current block.
- the adder 235 restores the obtained residual signal by adding it to the prediction signal (predicted block, prediction sample array) output from the prediction unit (including the inter prediction unit 260 and/or the intra prediction unit 265 ).
- a signal (reconstructed picture, reconstructed block, reconstructed sample array) may be generated.
- the predicted block may be used as a reconstructed block.
- the description of the adder 155 may be equally applied to the adder 235 .
- the addition unit 235 may be called a restoration unit or a restoration block generation unit.
- the generated reconstructed signal may be used for intra prediction of the next processing object block in the current picture, or may be used for inter prediction of the next picture after filtering as described below.
- the filtering unit 240 may improve subjective/objective image quality by applying filtering to the reconstructed signal.
- the filtering unit 240 may generate a modified reconstructed picture by applying various filtering methods to the reconstructed picture, and store the modified reconstructed picture in the memory 250 , specifically, the DPB of the memory 250 .
- the various filtering methods may include, for example, deblocking filtering, a sample adaptive offset, an adaptive loop filter, a bilateral filter, and the like.
- the (modified) reconstructed picture stored in the DPB of the memory 250 may be used as a reference picture in the inter prediction unit 260 .
- the memory 250 may store motion information of a block in which motion information in the current picture is derived (or decoded) and/or motion information of blocks in an already reconstructed picture.
- the stored motion information may be transmitted to the inter prediction unit 260 to be used as motion information of a spatial neighboring block or motion information of a temporal neighboring block.
- the memory 250 may store reconstructed samples of blocks reconstructed in the current picture, and may transmit the reconstructed samples to the intra prediction unit 265 .
- the embodiments described in the filtering unit 160, the inter prediction unit 180, and the intra prediction unit 185 of the image encoding apparatus 100 include the filtering unit 240 of the image decoding apparatus 200, The same or corresponding application may be applied to the inter prediction unit 260 and the intra prediction unit 265 .
- pictures constituting the video/video may be encoded/decoded according to a series of decoding orders.
- a picture order corresponding to an output order of decoded pictures may be set different from the decoding order, and based on this, not only forward prediction but also backward prediction may be performed during inter prediction based on this.
- FIG. 4 is a schematic flowchart of an image decoding procedure to which an embodiment according to the present disclosure is applicable.
- step S410 may be performed by the entropy decoding unit 210 of the image decoding apparatus
- step S420 may be performed by the prediction units 260 and 265
- step S430 may be performed by the residual processing units 220 and 230 .
- step S440 may be performed by the adder 235
- step S450 may be performed by the filtering unit 240 .
- Step S410 may include the information decoding (parsing) procedure described in this disclosure
- step S420 may include the inter/intra prediction procedure described in this disclosure
- step S430 may include the residual processing described in this disclosure.
- procedure, step S440 may include the block/picture restoration procedure described in this disclosure
- step S450 may include the in-loop filtering procedure described in this disclosure.
- the image decoding procedure schematically includes a procedure for obtaining image/video information (through decoding) from a bitstream (S410), an image (picture) restoration procedure (S420 to S440), and a restored image (picture) may include an in-loop filtering procedure (S450) for .
- the image restoration procedure is based on prediction samples obtained through inter/intra prediction (S420) and residual samples obtained through residual processing (S430, inverse quantization and/or inverse transformation of quantized transform coefficients). can be performed.
- a modified reconstructed picture may be generated through an in-loop filtering procedure (S450) for the reconstructed picture generated through the image reconstructing procedure, and the modified reconstructed picture may be output as a decoded picture, and It is stored in the decoded picture buffer (DPB) 250 or memory of the image decoding apparatus and may be used as a reference picture in an inter prediction procedure when decoding a picture thereafter.
- the in-loop filtering procedure may be omitted, and in this case, the reconstructed picture may be output as a decoded picture, and is also stored in the decoded picture buffer 250 or memory of the image decoding apparatus when decoding a picture thereafter. It can be used as a reference picture in the inter prediction procedure.
- the in-loop filtering procedure may include a deblocking filtering procedure, a sample adaptive offset (SAO) procedure, an adaptive loop filter (ALF) procedure, and/or a bi-lateral filter procedure as described above. may be, and some or all of them may be omitted.
- one or some of the deblocking filtering procedure, the sample adaptive offset (SAO) procedure, the adaptive loop filter (ALF) procedure, and the bi-lateral filter procedure may be sequentially applied, or all are sequential may be applied as
- the SAO procedure may be performed.
- the ALF procedure may be performed. This may be similarly performed in the image encoding apparatus.
- FIG. 5 is a schematic flowchart of an image encoding procedure to which an embodiment according to the present disclosure is applicable.
- step S510 may be performed by the prediction units 180 and 185 of the image encoding apparatus
- operation S520 may be performed by the residual processing units 115 , 120 and 130
- step S530 may be performed by the entropy encoding unit.
- Step S510 may include the inter/intra prediction procedure described in this disclosure
- step S520 may include the residual processing procedure described in this disclosure
- step S530 may include the information encoding procedure described in this disclosure. can do.
- the image encoding procedure schematically encodes and outputs information for picture restoration (eg, prediction information, residual information, partitioning information, etc.) in the form of a bitstream, as well as a restored picture for the current picture. It may include a procedure for generating , and a procedure for applying in-loop filtering to the reconstructed picture (optional).
- the image encoding apparatus may derive (corrected) residual samples from the quantized transform coefficients through the inverse quantization unit 140 and the inverse transform unit 150, and the prediction samples output from step S510 and the (modified) A reconstructed picture may be generated based on the residual samples.
- the reconstructed picture thus generated may be the same as the reconstructed picture generated by the above-described image decoding apparatus.
- a modified reconstructed picture may be generated through an in-loop filtering procedure for the reconstructed picture, which may be stored in a decoded picture buffer (DPB) 170 or a memory, and as in the case of an image decoding apparatus, a subsequent picture It can be used as a reference picture in the inter prediction procedure when encoding .
- DPB decoded picture buffer
- a subsequent picture It can be used as a reference picture in the inter prediction procedure when encoding .
- some or all of the in-loop filtering procedure may be omitted in some cases.
- (in-loop) filtering-related information may be encoded by the entropy encoding unit 190 and output in the form of a bitstream, and the image decoding apparatus based on the filtering-related information
- the in-loop filtering procedure may be performed in the same way as the image encoding apparatus.
- noise generated during video/video coding such as blocking artifacts and ringing artifacts
- subjective/objective visual quality can be improved.
- the image encoding apparatus and the image decoding apparatus can derive the same prediction result, increase the reliability of picture coding, and must be transmitted for picture coding. You can reduce the amount of data.
- the image (picture) restoration procedure may be performed not only in the image decoding apparatus but also in the image encoding apparatus.
- a reconstructed block may be generated based on intra prediction/inter prediction for each block, and a reconstructed picture including the reconstructed blocks may be generated.
- the current picture/slice/tile group is an I picture/slice/tile group
- blocks included in the current picture/slice/tile group may be reconstructed based on only intra prediction.
- the current picture/slice/tile group is a P or B picture/slice/tile group
- blocks included in the current picture/slice/tile group may be reconstructed based on intra prediction or inter prediction.
- inter prediction may be applied to some blocks in the current picture/slice/tile group, and intra prediction may be applied to some remaining blocks.
- a color component of a picture may include a luma component and a chroma component, and the methods and embodiments according to the present disclosure may be applied to the luma component and the chroma component unless explicitly limited in the present disclosure.
- the deblocking filtering shown in FIG. 6 may correspond to the deblocking filtering of the in-loop filtering described above.
- the deblocking filtering shown in FIG. 6 may be performed, for example, by the filtering unit 160 of FIG. 2 or the filtering unit 240 of FIG. 3 .
- Deblocking filtering may correspond to a filtering technique that removes distortion generated at a boundary between blocks in a reconstructed picture.
- a target boundary may be derived from the reconstructed picture through the deblocking filtering procedure ( S610 ). Then, a boundary strength (BS) for the derived target boundary may be determined (S620). Deblocking filtering may be performed on the target boundary based on the determined boundary strength ( S630 ). The boundary strength may be determined based on prediction modes of two blocks adjacent to the target boundary, motion vector differences, whether reference pictures are the same, and/or existence of non-zero significant coefficients.
- Deblocking filtering may be applied to the reconstructed picture. Deblocking filtering may be performed in the same order as the decoding process for each CU of the reconstructed picture. First vertical edges can be filtered (horizontal filtering). The horizontal edges may then be filtered (vertical filtering). Deblocking filtering may be applied to all coding block (or sub-block) edges and transform block edges.
- in-loop filtering may include SAO.
- SAO may correspond to a method of compensating for an offset difference between a reconstructed picture and an original picture in units of samples.
- SAO may be applied based on a type such as a band offset or an edge offset.
- samples may be classified into different categories according to each SAO type.
- An offset value may be added to each sample based on the classified category.
- the filtering information for SAO may include information on whether SAO is applied, SAO type information, and/or SAO offset value information.
- SAO may be applied to a reconstructed picture after applying deblocking filtering.
- in-loop filtering may include ALF.
- ALF may correspond to a technique of filtering a reconstructed picture in units of samples based on filter coefficients according to a filter shape.
- the encoding apparatus may determine whether to apply ALF, an ALF shape, and/or an ALF filtering coefficient, etc. through comparison between the reconstructed picture and the original picture. And, it may be signaled to the decoding device.
- the filtering information for ALF may include information on whether ALF is applied, ALF filter shape information, and/or ALF filtering coefficient information.
- ALF may be applied to the reconstructed picture after applying deblocking filtering.
- the boundary strength may be determined according to a condition for two blocks adjacent to the target boundary.
- boundary strength and boundary filtering strength may be used interchangeably.
- FIG. 14 is a diagram illustrating two blocks and samples adjacent to a target boundary of deblocking filtering according to an embodiment of the present disclosure.
- a boundary indicated by a thick solid line in FIG. 14 may be a target boundary of deblocking filtering.
- a left block when the target boundary is a vertical boundary, a left block may be defined as a P block and a right block as a Q block based on the target boundary.
- an upper block when the target boundary is a horizontal boundary, an upper block may be defined as a P block and a lower block as a Q block based on the target boundary.
- a sample in a P block may be denoted by p n
- a sample in a Q block may be denoted by qn. That is, pn and qn may be samples facing the boundary (target boundary) between the P block and the Q block.
- n is an integer greater than or equal to 0, and may mean a distance from the target boundary.
- p0 may be a sample in the P block immediately adjacent to the target boundary
- q0 may mean a sample in the Q block immediately adjacent to the target boundary.
- p0 may be a sample of a left or upper block adjoining a target boundary
- q0 may be a sample of a right or lower block adjoining a target boundary.
- a sample in the P block may be denoted by pn, m
- a sample in the Q block may be denoted by qn, m.
- n is an integer greater than or equal to 0, and may mean a distance from the target boundary.
- m may be an index for distinguishing samples that are at the same distance from the target boundary within one block (P block or Q block).
- the first value, the second value, and the third value of the boundary strength may mean 0, 1, and 2, respectively, but the scope of the present disclosure is not limited by these definitions.
- the image encoding apparatus and/or the image decoding apparatus may perform deblocking filtering based on the boundary strength. For example, when the boundary strength is the first value (e.g. 0), filtering may not be applied to the corresponding target boundary. Deblocking filtering may be applied based on filter strength (strong filter/weak filter) and/or filter length.
- filter strength strong filter/weak filter
- deblocking filtering may be performed by obtaining information related to deblocking filtering from a bitstream.
- the information related to deblocking filtering may include a flag indicating whether deblocking filtering is available.
- the information related to the deblocking filtering may include information used for deriving the boundary strength.
- the deblocking filtering procedure may be individually performed according to color components (luma component (Y) and chroma component (cb, cr)) of the reconstructed picture.
- the boundary intensity bS may be derived differently according to color components (luma component Y and chroma component cb, cr).
- the target boundary may be separately derived according to color components (luma component (Y) and chroma component (cb, cr)).
- a color component may be indicated by a component index cIdx. For example, if cIdx is 0, it may indicate a luma component. In addition, if cIdx is 1, it may represent the chroma component cb, and if cIdx is 2, it may represent the chroma component cr.
- FIG. 7 is a flowchart illustrating a method of determining a boundary strength for a target boundary according to an embodiment of the present disclosure.
- BDPCM block based quantized residual domain differential pulse-code modulation
- a chroma component block e.g. cIdx > 0
- the boundary strength for the corresponding target boundary may be determined as a first value (e.g. 0).
- step S730 may be determined. Specifically, it may be determined whether the sample p0 or the sample q0 is included in the coding block coded in the intra prediction mode (S730). When the above condition is satisfied (S730-YES), the boundary strength for the corresponding target boundary may be determined as a third value (e.g. 2).
- step S740 may be determined.
- the boundary strength for the corresponding target boundary may be determined as a third value (e.g. 2).
- step S750 may be determined. Specifically, it may be determined whether the target boundary is the boundary of the transform block, and the sample p0 or the sample q0 is included in the transform block having one or more non-zero transform coefficient levels. (S750). When the above condition is satisfied (S750-YES), the boundary strength for the corresponding target boundary may be determined as the second value (e.g. 1).
- step S760 may be determined. Specifically, it may be determined whether the prediction mode of the coding subblock including the sample p0 is different from the prediction mode of the coding subblock including the sample q0 ( S760 ).
- the boundary strength for the corresponding target boundary may be determined as the second value (e.g. 1). For example, when one of the two coding subblocks located on both sides of the target boundary is coded in the IBC prediction mode and the other is coded in the inter prediction mode, the boundary strength for the target boundary is a second value (eg 1) can be determined as
- Both the coding subblock including the sample p0 and the coding subblock including the sample q0 are coded in the IBC prediction mode, and the difference between the horizontal components or the vertical components of the block vectors of each subblock is 1/16 More than 8 unit values in luminance sample units.
- the coding subblock including the sample p0 and the coding subblock including the sample q0 refer to different reference pictures or have different numbers of motion vectors.
- whether the reference pictures are identical is determined only by considering whether the pictures referenced for inter prediction are identical, and whether the corresponding reference picture belongs to reference picture list 0 or reference picture list 1 is not considered. Also, whether the index values indicating the corresponding reference pictures are the same is not considered.
- the number of motion vectors may be determined using prediction direction flags (PredFlagL0, PredFlagL1). For example, the number of motion vectors may be derived as PredFlagL0 + PredFlagL1.
- One motion vector is used to predict the coding subblock including the sample p0 and the coding subblock including the sample q0, and the difference between the horizontal components or the vertical components of the motion vectors of each subblock is greater than or equal to 8 unit values in 1/16 luminance sample units.
- Condition 5 two motion vectors for the same reference picture are used to predict the coding subblock containing the sample p0, and two motion vectors for the same reference picture are used to predict the coding subblock containing the sample q0 is used, and the following two conditions (Condition 5-1, Condition 5-2) are all satisfied.
- the difference between the vertical (or horizontal) components of the motion vectors may mean an absolute value of the difference between the vertical (or horizontal) components of the motion vectors.
- the boundary strength for the corresponding target boundary may be determined as a first value (e.g. 0).
- the method of determining the boundary strength bS described with reference to FIG. 7 is exemplary, and the method of determining the boundary strength according to the present disclosure is not limited to the example illustrated in FIG. 7 .
- some of the steps shown in FIG. 7 may be omitted, and steps other than those shown in FIG. 7 may be added at any position on the flowchart of FIG. 7 .
- some of the steps illustrated in FIG. 7 may be performed simultaneously with other steps or the order of other steps may be changed.
- step S750 determines whether two transform blocks adjacent to the target boundary include a non-zero transform coefficient level. And, if the condition of step S750 is satisfied, the boundary strength for the target boundary is determined as the second value (e.g. 1).
- joint CbCr residual coding may refer to a technique in which residual samples for two chroma components (e.g. Cb component and Cr component) are encoded as a single transform block. Whether joint CbCr residual encoding is applied to the current block may be determined based on information (e.g. flag) signaled through a bitstream.
- the image encoding apparatus may determine whether to perform joint CbCr residual encoding on the current block, and may encode the flag information into a bitstream based on this. Also, the image decoding apparatus may determine whether joint CbCr residual encoding is performed (or performed) on the current block by parsing the flag information from the bitstream, and may reconstruct the current block based thereon.
- the flag information may be tu_joint_cbcr_residual_flag in the present disclosure.
- FIG. 8 is a diagram for explaining signaling of a syntax element in a transform block related to an embodiment of the present disclosure.
- tu_cb_coded_flag[x][y] is a transform block of a Cb component whose coordinates of the upper left sample is (x, y) (hereinafter, referred to as “Cb transform block”) is one or more non-zero transforms It may indicate whether the coefficient level is included.
- tu_cb_coded_flag of the second value e.g. 1
- tu_cb_coded_flag of the first value e.g. 0
- the Cb transform block does not include one or more non-zero transform coefficient levels.
- tu_cb_coded_flag When tu_cb_coded_flag is the first value, all transform coefficient levels in the Cb transform block may be set to 0. Also, when tu_cb_coded_flag does not exist in the bitstream, its value may be inferred as the first value.
- tu_cr_coded_flag[x][y] is a transform block of a Cr component whose coordinates of the upper left sample is (x, y) (hereinafter referred to as “Cr transform block”) is one or more non-zero transforms It may indicate whether the coefficient level is included.
- tu_cr_coded_flag of the second value e.g. 1
- tu_cr_coded_flag of the first value e.g. 0
- the Cr transform block does not include one or more non-zero transform coefficient levels.
- tu_cr_coded_flag When tu_cr_coded_flag is the first value, all of the transform coefficient levels in the Cr transform block may be set to 0. Also, when tu_cr_coded_flag does not exist in the bitstream, its value may be inferred as the first value.
- tu_y_coded_flag[x][y] is a transform block of a luma component whose coordinates of the upper left sample is (x, y) (hereinafter, referred to as “luma transform block”) is one or more non-zero transforms It may indicate whether the coefficient level is included.
- tu_y_coded_flag of the second value e.g. 1
- tu_y_coded_flag of the first value e.g. 0
- the luma transform block does not include one or more non-zero transform coefficient levels.
- tu_y_coded_flag When tu_y_coded_flag is the first value, all of the transform coefficient levels in the luma transform block may be set to 0. If tu_y_coded_flag is not present in the bitstream, its value may be inferred as the first value or the second value based on various other syntax elements and/or variables.
- tu_joint_cbcr_residual_flag[x][y] is a single transform for a transform block in which the coordinates of the upper-left sample are (x, y), the residual sample for the Cb component and the residual sample for the Cr component. It may indicate whether it is coded as a block.
- tu_joint_cbcr_residual_flag is a second value (e.g. 1)
- the transform unit includes transform coefficient levels for a single transform block, and residual samples for a Cb component and a Cr component can be derived from the single transform block.
- transform coefficient levels for chroma components may be encoded/decoded as indicated by tu_cb_coded_flag and tu_cr_coded_flag. For example, if tu_cb_coded_flag is 1, transform coefficient levels for the Cb transform block may be coded/decoded, and if tu_cb_coded_flag is 0, transform coefficient levels for the Cb transform block may be inferred to be 0 without being coded/decoded.
- tu_cr_coded_flag 1
- the transform coefficient levels for the Cr transform block may be coded/decoded
- tu_cr_coded_flag 0
- the transform coefficient levels for the Cr transform block may be inferred to be 0 without being coded/decoded.
- tu_joint_cbcr_residual_flag does not exist in the bitstream, its value may be inferred as the first value.
- the transmission of residual information includes various parameters and/or It may be determined based on conditions. It is apparent from FIG. 8 that the signaling conditions of residual information are not limited to tu_y_coded_flag, tu_cb_coded_flag, and tu_cr_coded_flag.
- signaling conditions of residual information may include some or all of the signaling conditions shown in FIG. 8 or additional signaling conditions not shown in FIG. 8 .
- the signaling condition of the residual information may include some or all of the signaling conditions shown in FIG. 8 or additional signaling conditions not shown in FIG. 8 .
- FIG. 8 for example, when tu_y_coded_flag is 1, residual information for the luma transform block may be signaled.
- residual information for the Cb transform block and the Cr transform block may be respectively signaled based on tu_cb_coded_flag and tu_cr_coded_flag.
- residual information for a Cr transform block may be signaled only when the following condition is satisfied.
- the Cb transform block since tu_cb_coded_flag is 1, the Cb transform block includes at least one non-zero transform coefficient level, and even though tu_cr_coded_flag is 1, in the Cr transform block, all transform coefficient levels may be derived to 0. Accordingly, based on the determination in step S750, the boundary strength of the target boundary for the Cb component may be induced to be 1, and the boundary strength of the target boundary for the Cr component may be induced to a value other than 1.
- step S750 although tu_cr_coded_flag is 1, the boundary strength of the target boundary for the Cr component may be derived to a value other than 1.
- the Cr transform block may include one or more non-zero transform coefficient levels. Nevertheless, in step S750, the boundary strength of the target boundary with respect to the Cr component may be derived to a value other than 1.
- FIG. 9 is a flowchart illustrating a method of determining a boundary strength for a target boundary according to another embodiment of the present disclosure.
- steps S710 to S750 of FIG. 7 may correspond to steps S910 to S950 of FIG. 9 , respectively.
- steps S760 to S770 of FIG. 7 may correspond to steps S970 to S980 of FIG. 9 , respectively.
- a redundant description of each of the corresponding steps will be omitted.
- the method for determining boundary strength according to FIG. 9 further includes step S960 compared to the method of FIG. 7 .
- step S960 may be determined. More specifically, it may be determined whether the target boundary is the boundary of the transform block and at least one of two conditions to be described below is satisfied ( S960 ). When the above condition is satisfied (S960-YES), the boundary strength for the corresponding target boundary may be determined as the second value (e.g. 1).
- the conditions S960-1 and S960-2 may be combined as one condition, for example, as follows.
- the method of determining the boundary strength bS described with reference to FIG. 9 is exemplary, and the method of determining the boundary strength according to the present disclosure is not limited to the example illustrated in FIG. 9 .
- some of the steps shown in FIG. 9 may be omitted, and steps other than the steps shown in FIG. 9 may be added at any position on the flowchart of FIG. 9 .
- some of the steps shown in FIG. 9 may be performed simultaneously with other steps or the order of other steps may be changed.
- tu_joint_cbcr_residual_flag may mean that at least one of tu_cu_coded_flag or tu_cr_coded_flag is 1, the Cb transform block or the Cr transform block may be changed to omit step S950 in the boundary strength determination method according to FIG. 9 .
- the above two problems that may be caused by the application of joint CbCr residual coding can be solved. That is, when joint CbCr residual encoding is applied, the boundary strength of deblocking filtering on the transform block boundary may be determined as a non-zero value (e.g. 1).
- FIG. 10 is a flowchart illustrating a method of determining a boundary strength for a target boundary according to another embodiment of the present disclosure.
- FIG. 10 is an improvement of the method of determining the boundary strength described with reference to FIG. 7 , and some steps of the method of FIG. 7 and the method of FIG. 10 may be the same or overlapping.
- redundant descriptions of the same or overlapping steps may be omitted.
- steps S710 to S740 of FIG. 7 may correspond to steps S1010 to S1040 of FIG. 10 , respectively.
- steps S760 to S770 of FIG. 7 may correspond to steps S1060 to S1070 of FIG. 10 , respectively.
- a redundant description of each of the corresponding steps will be omitted.
- the method for determining the boundary strength according to FIG. 10 may include step S1050 instead of step S750 as compared with the method of FIG. 7 .
- step S1050 may be determined. Specifically, it may be determined whether the target boundary is the boundary of the transform block, and at least one of three conditions to be described below is satisfied ( S1050 ). When the above condition is satisfied (S1050-YES), the boundary strength for the corresponding target boundary may be determined as the second value (e.g. 1).
- the method for determining the boundary strength bS described with reference to FIG. 10 is exemplary, and the method for determining the boundary strength according to the present disclosure is not limited to the example illustrated in FIG. 10 .
- some of the steps shown in FIG. 10 may be omitted, and steps other than the steps shown in FIG. 10 may be added at any position on the flowchart of FIG. 10 .
- some of the steps shown in FIG. 10 may be performed simultaneously with other steps or the order of other steps may be changed.
- the above two problems that may be caused by the application of joint CbCr residual coding can be solved. That is, since the method of FIG. 10 determines whether a transform block includes one or more non-zero transform coefficient levels for each color component, even when joint CbCr residual encoding is applied, the boundary of deblocking filtering on the transform block boundary intensity can be accurately determined.
- FIG. 11 is a flowchart illustrating a method of determining a boundary strength for a target boundary according to another embodiment of the present disclosure.
- FIG. 11 is an improvement of the method for determining boundary strength described with reference to FIG. 7 , and some steps of the method of FIG. 7 and the method of FIG. 11 may be the same or may overlap. In the method of FIG. 7 and the method of FIG. 11 , redundant descriptions of the same or overlapping steps may be omitted.
- steps S710 to S740 of FIG. 7 may correspond to steps S1110 to S1140 of FIG. 11 , respectively.
- steps S760 to S770 of FIG. 7 may correspond to steps S1160 through S1170 of FIG. 11 , respectively.
- a redundant description of each of the corresponding steps will be omitted.
- the method for determining the boundary strength according to FIG. 11 may include step S1150 instead of step S750 as compared with the method of FIG. 7 .
- step S1150 may be determined. Specifically, it may be determined whether the target boundary is the boundary of the transform block and at least one of four conditions to be described below is satisfied ( S1150 ). When the above condition is satisfied (S1150-YES), the boundary strength for the corresponding target boundary may be determined as the second value (e.g. 1).
- the method of determining the boundary strength bS described with reference to FIG. 11 is exemplary, and the method of determining the boundary strength according to the present disclosure is not limited to the example illustrated in FIG. 11 .
- some of the steps shown in FIG. 11 may be omitted, and steps other than those shown in FIG. 11 may be added at any position on the flowchart of FIG. 11 .
- some of the steps shown in FIG. 11 may be performed simultaneously with other steps or the order of other steps may be changed.
- the boundary strength determination method described with reference to FIG. 11 the above two problems that may be caused by the application of joint CbCr residual coding can be solved. That is, since the method of FIG. 11 determines whether a transform block includes one or more non-zero transform coefficient levels for each color component, even when joint CbCr residual coding is applied, the boundary of deblocking filtering on the transform block boundary intensity can be accurately determined. Also, according to the method of FIG. 11 , when joint CbCr residual encoding is applied, the boundary strength of deblocking filtering on the transform block boundary may be determined to be a non-zero value (e.g. 1).
- the determination of the boundary strength based on the determination of whether a transform block includes one or more non-zero transform coefficient levels is variously changed.
- the boundary strength is the second value (eg 1).
- the boundary strength is the second value (eg 1) can be determined.
- step S750 may be changed as follows.
- the corresponding boundary strength may be determined as a second value (e.g. 1).
- the boundary strength is eg 1).
- the boundary The intensity may be determined as a second value (eg 1).
- FIG. 12 is a flowchart illustrating an encoding process based on deblocking filtering according to the present disclosure.
- the image encoding apparatus may generate a reconstructed picture ( S1210 ).
- the image encoding apparatus may generate a reconstructed picture by encoding an input image to be encoded and then reconstructing it.
- the image encoding apparatus may derive deblocking filter related information for the reconstructed picture (S1220).
- the deblocking filter-related information may include a flag indicating whether the deblocking filter is available.
- the deblocking filter-related information may include various information used to derive the boundary strength.
- the boundary strength may be derived differently according to the luma component (Y) and the chroma component (cb, cr).
- a target boundary to which deblocking filtering is applied may be separately derived according to the luma component (Y) and the chroma component (cb, cr).
- the image encoding apparatus may generate a corrected reconstructed picture by applying deblocking filtering to the reconstructed picture based on the derived deblocking filter related information (S1230).
- the corrected reconstructed picture may be transmitted to the memory 170 and used as a reference picture in the inter prediction unit 180 .
- the DPB in the memory 170 may store a reconstructed picture modified for use as a reference picture for inter prediction.
- the image encoding apparatus may encode image data including deblocking filter-related information (S1240).
- the deblocking filter related information may be transmitted to the entropy encoding unit 190 , encoded by the entropy encoding unit 190 and outputted in the form of a bitstream.
- FIG. 13 is a flowchart illustrating a decoding process based on deblocking filtering according to the present disclosure.
- the image decoding apparatus may obtain image data including deblocking filter-related information from a bitstream ( S1310 ).
- the image decoding apparatus 200 of FIG. 3 may receive the signal output from the image encoding apparatus 100 of FIG. 2 in the form of a bitstream.
- the entropy decoding unit 210 may parse the bitstream to obtain information (eg, video/image information) necessary for image restoration (or picture restoration).
- the image decoding apparatus may generate a restored picture based on the acquired image information (S1320).
- the adder 235 of the image decoding apparatus 200 of FIG. 3 converts the obtained residual signal into the prediction signal (prediction) output from the prediction unit (the inter prediction unit 260 and/or the intra prediction unit 265 ).
- a reconstructed picture can be generated by adding the block to the predicted sample array).
- the image decoding apparatus may generate a corrected reconstructed picture by applying deblocking filtering to the reconstructed picture (S1330).
- the filtering unit 240 of the image decoding apparatus 200 of FIG. 3 may improve subjective/objective image quality by applying filtering to the reconstructed picture.
- the filtering unit 240 may generate a modified reconstructed picture by applying various filtering methods to the reconstructed picture.
- the modified reconstructed picture may be stored in the memory 250 , specifically, the DPB of the memory 250 .
- the (modified) reconstructed picture stored in the DPB of the memory 250 may be used as a reference picture in the inter prediction unit 260 .
- Example methods of the present disclosure are expressed as a series of operations for clarity of description, but this is not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order.
- other steps may be included in addition to the illustrated steps, steps may be excluded from some steps, and/or other steps may be included except for some steps.
- an image encoding apparatus or an image decoding apparatus performing a predetermined operation may perform an operation (step) of confirming a condition or situation for performing the corresponding operation (step). For example, if it is stated that a predetermined operation is performed when a predetermined condition is satisfied, the image encoding apparatus or the image decoding apparatus performs an operation to check whether the predetermined condition is satisfied and then performs the predetermined operation can
- various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs Field Programmable Gate Arrays
- general purpose It may be implemented by a processor (general processor), a controller, a microcontroller, a microprocessor, and the like.
- the image decoding apparatus and the image encoding apparatus to which the embodiments of the present disclosure are applied are real-time communication apparatuses such as a multimedia broadcasting transceiver, a mobile communication terminal, a home cinema video apparatus, a digital cinema video apparatus, a surveillance camera, a video conversation apparatus, and a video communication apparatus.
- mobile streaming device storage medium, camcorder, video on demand (VoD) service providing device, OTT video (Over the top video) device, internet streaming service providing device, three-dimensional (3D) video device, video telephony video device, and medical use It may be included in a video device and the like, and may be used to process a video signal or a data signal.
- the 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 smart phone, a tablet PC, a digital video recorder (DVR), and the like.
- a game console a Blu-ray player
- an Internet-connected TV a home theater system
- a smart phone a tablet PC
- DVR digital video recorder
- 15 is a diagram illustrating a content streaming system to which an embodiment of the present disclosure can be applied.
- the content streaming system to which the embodiment of the present disclosure is applied may largely include an encoding server, a streaming server, a web server, a media storage, a user device, and a multimedia input device.
- the encoding server generates a bitstream by compressing content input from multimedia input devices such as a smart phone, a camera, a camcorder, etc. into digital data, and transmits it to the streaming server.
- multimedia input devices such as a smart phone, a camera, a camcorder, etc. directly generate a bitstream
- the encoding server may be omitted.
- the bitstream may be generated by an image encoding method and/or an image encoding apparatus to which an embodiment of the present disclosure is applied, and the streaming server may temporarily store the bitstream in a process of transmitting or receiving the bitstream.
- the streaming server transmits multimedia data to the user device based on a user request through the web server, and the web server may serve as a medium informing the user of a service.
- the web server transmits it to a streaming server, and the streaming server may transmit multimedia data to the user.
- the content streaming system may include a separate control server.
- the control server may serve to control commands/responses between devices in the content streaming system.
- the streaming server may receive content from a media repository and/or an encoding server. For example, when receiving content 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, Tablet PC (tablet PC), ultrabook (ultrabook), wearable device (e.g., watch-type terminal (smartwatch), glass-type terminal (smart glass), HMD (head mounted display)), digital TV, desktop There may be a computer, digital signage, and the like.
- PDA personal digital assistant
- PMP portable multimedia player
- PDA portable multimedia player
- slate PC slate PC
- Tablet PC Tablet PC
- ultrabook ultrabook
- wearable device e.g., watch-type terminal (smartwatch), glass-type terminal (smart glass), HMD (head mounted display)
- digital TV desktop
- desktop There may be a computer, digital signage, and the like.
- 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 distributed and processed.
- the scope of the present disclosure includes software or machine-executable instructions (eg, operating system, application, firmware, program, etc.) that cause operation according to the method of various embodiments to be executed on a device or computer, and such software or and non-transitory computer-readable media in which instructions and the like are stored and executed on a device or computer.
- software or machine-executable instructions eg, operating system, application, firmware, program, etc.
- An embodiment according to the present disclosure may be used to encode/decode an image.
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Abstract
Description
Claims (15)
- 영상 복호화 장치에 의해 수행되는 영상 복호화 방법에 있어서,복원 픽처를 획득하는 단계;상기 복원 픽처 내 디블록킹 필터링의 타겟 경계(target boundary)를 결정하는 단계;상기 타겟 경계에 대한 경계 강도를 결정하는 단계; 및상기 경계 강도에 기초하여 상기 타겟 경계에 디블록킹 필터링을 적용하는 단계를 포함하고,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들 중 적어도 하나에 대해 조인트 CbCr 잔차 부호화가 수행되는지의 여부에 기반하여 결정되고,상기 조인트 CbCr 잔차 부호화는 크로마 Cb 성분 및 크로마 Cr 성분에 대한 잔차 샘플들을 단일 변환 블록으로 부호화하는 것인 영상 복호화 방법.
- 제1항에 있어서,상기 타겟 경계에 인접한 블록에 대해 조인트 CbCr 잔차 부호화가 수행되는지의 여부는 상기 인접한 블록에 대해 시그널링되는 제1 플래그에 기반하여 결정되는 영상 복호화 방법.
- 제2항에 있어서,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들 중 적어도 하나가 0이 아닌 변환 계수 레벨을 포함하는지의 여부에 더 기반하여 결정되는 영상 복호화 방법.
- 제3항에 있어서,상기 타겟 경계에 인접한 블록이 적어도 하나가 0이 아닌 변환 계수 레벨을 포함하는지의 여부는 상기 인접한 블록에 대해 시그널링되는 제2 플래그에 기반하여 결정되는 영상 복호화 방법.
- 제4항에 있어서,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들에 대한 두개의 제1 플래그 및 두개의 제2 플래그의 합에 기반하여 결정되는 영상 복호화 방법.
- 제5항에 있어서,상기 합이 0보다 큰 경우, 상기 경계 강도는 1로 결정되는 영상 복호화 방법.
- 제1항에 있어서,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 루마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들 중 적어도 하나가 0이 아닌 변환 계수 레벨을 포함하는지의 여부에 기반하여 결정되는 영상 복호화 방법.
- 메모리 및 적어도 하나의 프로세서를 포함하는 영상 복호화 장치로서,상기 적어도 하나의 프로세서는복원 픽처를 획득하고,상기 복원 픽처 내 디블록킹 필터링의 타겟 경계(target boundary)를 결정하고,상기 타겟 경계에 대한 경계 강도를 결정하고,상기 경계 강도에 기초하여 상기 타겟 경계에 디블록킹 필터링을 적용하되,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들 중 적어도 하나에 대해 조인트 CbCr 잔차 부호화가 수행되는지의 여부에 기반하여 결정되고,상기 조인트 CbCr 잔차 부호화는 크로마 Cb 성분 및 크로마 Cr 성분에 대한 잔차 샘플들을 단일 변환 블록으로 부호화하는 것인 영상 복호화 장치.
- 영상 부호화 장치에 의해 수행되는 영상 부호화 방법에 있어서,복원 픽처를 생성하는 단계;상기 복원 픽처 내 디블록킹 필터링의 타겟 경계(target boundary)를 결정하는 단계;상기 타겟 경계에 대한 경계 강도를 결정하는 단계; 및상기 경계 강도에 기초하여 상기 타겟 경계에 디블록킹 필터링을 적용하는 단계를 포함하고,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들 중 적어도 하나에 대해 조인트 CbCr 잔차 부호화가 수행되는지의 여부에 기반하여 결정되고,상기 조인트 CbCr 잔차 부호화는 크로마 Cb 성분 및 크로마 Cr 성분에 대한 잔차 샘플들을 단일 변환 블록으로 부호화하는 것인 영상 부호화 방법.
- 제9항에 있어서,상기 타겟 경계에 인접한 블록에 대해 조인트 CbCr 잔차 부호화가 수행되는지의 여부는 상기 인접한 블록에 대해 시그널링되는 제1 플래그를 이용하여 부호화되는 영상 부호화 방법.
- 제10항에 있어서,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들 중 적어도 하나가 0이 아닌 변환 계수 레벨을 포함하는지의 여부에 더 기반하여 결정되는 영상 부호화 방법.
- 제11항에 있어서,상기 타겟 경계에 인접한 블록이 적어도 하나가 0이 아닌 변환 계수 레벨을 포함하는지의 여부는 상기 인접한 블록에 대해 시그널링되는 제2 플래그를 이용하여 부호화되는 영상 부호화 방법.
- 제12항에 있어서,상기 타겟 경계가 변환 블록 경계이고, 상기 복원 픽처의 색 성분이 크로마 성분인 경우, 상기 경계 강도는 상기 타겟 경계에 인접한 두개의 블록들에 대한 두개의 제1 플래그 및 두개의 제2 플래그의 합에 기반하여 결정되는 영상 부호화 방법.
- 제13항에 있어서,상기 합이 0보다 큰 경우, 상기 경계 강도는 1로 결정되는 영상 부호화 방법.
- 제9항의 영상 부호화 방법에 의해 생성된 비트스트림을 저장한 컴퓨터 판독가능한 기록매체.
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AU2021243894A AU2021243894B2 (en) | 2020-03-25 | 2021-03-17 | Method and apparatus for encoding/decoding image, for performing deblocking filtering by determining boundary strength, and method for transmitting bitstream |
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CA3177233A CA3177233C (en) | 2020-03-25 | 2021-03-17 | Method and apparatus for encoding/decoding image, for performing deblocking filtering by determining boundary strength, and method for transmitting bitstream |
US17/914,492 US11818341B2 (en) | 2020-03-25 | 2021-03-17 | Method and apparatus for encoding/decoding image, for performing deblocking filtering by determining boundary strength, and method for transmitting bitstream |
KR1020237011975A KR20230050486A (ko) | 2020-03-25 | 2021-03-17 | 경계 강도를 결정하여 디블록킹 필터링을 수행하는 영상 부호화/복호화 방법, 장치 및 비트스트림을 전송하는 방법 |
CN202180023710.4A CN115315959A (zh) | 2020-03-25 | 2021-03-17 | 通过确定边界强度执行去块滤波的图像编码/解码方法和设备及发送比特流的方法 |
ZA2022/10842A ZA202210842B (en) | 2020-03-25 | 2022-09-30 | Method and apparatus for encoding/decoding image, for performing deblocking filtering by determining boundary strength, and method for transmitting bitstream |
US18/206,499 US20230353733A1 (en) | 2020-03-25 | 2023-06-06 | Method and apparatus for encoding/decoding image, for performing deblocking filtering by determining boundary strength, and method for transmitting bitstream |
AU2024200788A AU2024200788A1 (en) | 2020-03-25 | 2024-02-08 | Method and apparatus for encoding/decoding image, for performing deblocking filtering by determining boundary strength, and method for transmitting bitstream |
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- 2021-03-17 CA CA3177233A patent/CA3177233C/en active Active
- 2021-03-17 WO PCT/KR2021/003309 patent/WO2021194155A1/ko active Application Filing
- 2021-03-17 KR KR1020237011975A patent/KR20230050486A/ko active Application Filing
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ZA202210842B (en) | 2024-04-24 |
CA3221589A1 (en) | 2021-09-30 |
AU2021243894A1 (en) | 2022-11-24 |
CA3177233C (en) | 2024-01-09 |
CA3177233A1 (en) | 2021-09-30 |
US11818341B2 (en) | 2023-11-14 |
KR20220152327A (ko) | 2022-11-15 |
AU2024200788A1 (en) | 2024-02-29 |
US20230115909A1 (en) | 2023-04-13 |
KR20230050486A (ko) | 2023-04-14 |
CN115315959A (zh) | 2022-11-08 |
US20230353733A1 (en) | 2023-11-02 |
AU2021243894B2 (en) | 2024-01-18 |
KR102520895B1 (ko) | 2023-04-11 |
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