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公开(公告)号：US20230091563A1
公开(公告)日：2023-03-23
申请号：US17994092
申请日：2022-11-25
Inventor： Li Zhang , Kai Zhang , Hongbin Liu , Jizheng Xu , Yue Wang
IPC: H04N19/82 , H04N19/117 , H04N19/119 , H04N19/159 , H04N19/176 , H04N19/61 , H04N19/86
Abstract: Devices, systems and methods for digital video coding. A method for video processing includes determining whether to apply and how to apply a filtering process for samples of a current video unit of a video based on whether the samples are located at predefined transform boundaries; and performing a conversion between the video and a bitstream representation of the video based on the determining, where the predefined transform boundaries are determined based on a first transform mode in which a transform region is split into multiple transform sub-regions and only one transform sub-region has a non-zero residual sample.
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公开(公告)号：US11606570B2
公开(公告)日：2023-03-14
申请号：US17731472
申请日：2022-04-28
Inventor： Zhipin Deng , Kai Zhang , Li Zhang , Hongbin Liu , Jizheng Xu
IPC: H04N19/11 , H04N19/176 , H04N19/186 , H04N19/124 , H04N19/136 , H04N19/157 , H04N19/593 , H04N19/61 , H04N19/70 , H04N19/82
Abstract: Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes generating, for a conversion between a current video block of a video including multiple video blocks and a bitstream representation of the video, a most probable mode (MPM) list for a matrix based intra prediction (MIP) tool based on a rule, where, the MIP tool includes determining, during the conversion, a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, and where the rule specifies a mapping between a number of MIP modes and dimensions of the multiple video blocks; and performing the conversion based on the generating.
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公开(公告)号：US11595687B2
公开(公告)日：2023-02-28
申请号：US17338601
申请日：2021-06-03
Inventor： Kai Zhang , Li Zhang , Hongbin Liu , Jizheng Xu , Yue Wang
IPC: H04N19/00 , H04N19/593 , H04N19/176 , H04N19/186
Abstract: A method for video processing is provided. The method includes performing downsampling on chroma and luma samples of a neighboring block of the current video block; determining, for a conversion between a current video block of a video that is a chroma block and a coded representation of the video, parameters of cross-component linear model (CCLM) based on the downsampled chroma and luma samples obtained from the downsampling; applying the CCLM on luma samples located in a luma block corresponding to the current video block to derive prediction values of the current video block; and performing the conversion based on the prediction values.
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公开(公告)号：US11595671B2
公开(公告)日：2023-02-28
申请号：US17675796
申请日：2022-02-18
Inventor： Li Zhang , Kai Zhang , Hongbin Liu , Jizheng Xu , Yue Wang
IPC: H04N19/33 , H04N19/176 , H04N19/18 , H04N19/12 , H04N19/124 , H04N19/136 , H04N19/157 , H04N19/167 , H04N19/30 , H04N19/61 , H04N19/70 , H04N19/159 , H04N19/50
Abstract: A video processing method includes performing a conversion between a video block of a video and a coded representation of the video, wherein the coded representation conforms to a format rule, wherein the format rule specifies that applicability of a transform skip mode to the video block is determined by a coding condition of the video block, wherein the format rule specifies that a syntax element indicative of applicability of the transform skip mode is omitted from the coded representation, and wherein the transform skip mode includes, skipping applying a forward transform to at least some coefficients prior to encoding into the coded representation, or during decoding, skipping applying an inverse transform to at least some coefficients prior to decoding from the coded representation.
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公开(公告)号：US20230057982A1
公开(公告)日：2023-02-23
申请号：US17894878
申请日：2022-08-24
Inventor： Zhipin Deng , Kai Zhang , Li Zhang , Hongbin Liu , Jizheng Xu
IPC: H04N19/593 , H04N19/105 , H04N19/117 , H04N19/132 , H04N19/176 , H04N19/184
Abstract: Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on reference boundary samples located to a left of the current video block and located to a top of the current video block, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, where instead of reduced boundary samples calculated from the reference boundary samples of the current video block in the boundary downsampling operation, the reference boundary samples are directly used for a prediction process in the upsampling operation.
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Patent Agency Ranking
公开(公告)号：US20230051883A1
公开(公告)日：2023-02-16
申请号：US17965325
申请日：2022-10-13
Applicant: Bytedance Inc.
Inventor： Weijia Zhu , Jizheng Xu , Li Zhang , Hsiao Chiang Chuang
IPC: H04N19/70 , H04N19/132 , H04N19/176 , H04N19/186
Abstract: Methods, systems, and devices for performing entropy coding for a palette escape symbol in palette mode coding and decoding are described. An example method for video processing includes performing a conversion between a video having one or more video regions including a current video block and a bitstream representation of the video, wherein the bitstream representation conforms to a format rule that the current video block is coded using a palette mode coding tool, wherein a binarization of an escape symbol for the current video block uses an exponential-Golomb (EG) code of order K, wherein K is a non-negative integer that is unequal to three, and wherein the palette mode coding tool represents the current video block using a palette of representative color values and wherein the escape symbol is used for a sample of the current video block coded without using the representative color values.
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公开(公告)号：US11582451B2
公开(公告)日：2023-02-14
申请号：US17689320
申请日：2022-03-08
Inventor： Jizheng Xu , Kai Zhang , Li Zhang , Hongbin Liu , Zhipin Deng , Yue Wang
IPC: H04N19/122 , H04N19/103 , H04N19/172 , H04N19/186 , H04N19/60 , H04N19/132 , H04N19/176 , H04N19/18 , H04N19/30 , H04N19/46 , H04N19/124
Abstract: Methods, systems, and devices for coefficient scaling for high-precision image and video coding are described. A example method of video processing includes performing a conversion between a current block of a video and a bitstream representation of the video according to a rule, wherein the rule specifies that the conversion includes during encoding, skipping applying a forward transform to residual coefficients of the current block prior to including in the bitstream representation, or during decoding, reconstructing residual coefficients of the current block from the bitstream representation without applying an inverse transform, and wherein the rule further specifies that a scale factor is applied to the residual coefficients independent of a size of the current block.
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公开(公告)号：US11582447B2
公开(公告)日：2023-02-14
申请号：US17665275
申请日：2022-02-04
Inventor： Kai Zhang , Zhipin Deng , Hongbin Liu , Li Zhang , Jizheng Xu
IPC: H04N19/105 , H04N19/132 , H04N19/176 , H04N19/186 , H04N19/70 , H04N19/103 , H04N19/119 , H04N19/157 , H04N19/167 , H04N19/172 , H04N19/30 , H04N19/169
Abstract: A method of video processing includes performing a conversion between a video unit of a video and a coded representation of the video using at least a video picture. Only one of a sub-picture coding mode or a resolution-changing coding mode is enabled for the video unit. The sub-picture coding mode is a mode in which the video picture is divided into multiple sub-pictures, and the resolution-changing coding mode is a mode in which a resolution of the video picture is adjusted during the conversion.
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公开(公告)号：US20230044750A1
公开(公告)日：2023-02-09
申请号：US17950411
申请日：2022-09-22
Inventor： Zhipin Deng , Li Zhang , Ye-Kui Wang , Kai Zhang , Jizheng Xu
IPC: H04N19/117 , H04N19/70 , H04N19/174
Abstract: Methods and apparatus for video processing are disclosed. The processing may include video encoding, video decoding, or video transcoding. One example method includes performing a conversion between a video including a picture including one or more slices and a bitstream of the video. The conversion conforms to a rule that specifies that whether a deblocking filter is applied to the one or more slices referring to a picture parameter set is based at least on a first syntax element included in the picture parameter set. The first syntax element indicates whether the deblocking filter is disabled for the picture.
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公开(公告)号：US20230042746A1
公开(公告)日：2023-02-09
申请号：US17950443
申请日：2022-09-22
Inventor： Zhipin Deng , Li Zhang , Ye-Kui Wang , Kai Zhang , Jizheng Xu
IPC: H04N19/105 , H04N19/176 , H04N19/159 , H04N19/52 , H04N19/463 , H04N19/139 , H04N19/186 , H04N19/132 , H04N19/80
Abstract: A method includes determining, for a conversion between a video block of a video and a bitstream of the video, a size of prediction block corresponding to the video block according to a rule. The method also includes performing the conversion based on the determining. The rule specifies that a first size of the prediction block is determined responsive to whether a prediction refinement using optical flow technique is used for coding the video block. The video block has a second size and is coded using an affine merge mode or an affine advanced motion vector prediction mode.
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