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公开(公告)号：US20220109876A1
公开(公告)日：2022-04-07
申请号：US17406260
申请日：2021-08-19
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/61 , H04N19/159 , H04N19/186 , H04N19/176
Abstract: A video processing method includes determining, for a conversion between a block of a video and a bitstream representation of the video, that an output value from an inverse secondary transform with a reduced dimension (e.g., an inverse low frequency non-separable transform) is constrained within a range of [min, max] inclusively. The inverse secondary transform is applicable to the block between a de-quantization step and an inverse primary transform. The reduced dimension is reduced from a dimension of the block, and min and max are integer values. The method also includes performing the conversion based on the determining.
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公开(公告)号：US20220109868A1
公开(公告)日：2022-04-07
申请号：US17554294
申请日：2021-12-17
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/513 , H04N19/137 , G06F7/499 , G06F5/01 , H04N19/176 , H04N19/105
Abstract: Devices, systems and methods for digital video coding, which include sub-block based inter prediction methods, are described. An exemplary method for video processing includes determining, for a conversion between a current block of video and a bitstream representation of the video, a maximum number of candidates in a sub-block based merge candidate list and/or whether to add sub-block based temporal motion vector prediction (SbTMVP) candidates to the sub-block based merge candidate list based on whether temporal motion vector prediction (TMVP) is enabled for use during the conversion or whether a current picture referencing (CPR) coding mode is used for the conversion, and performing, based on the determining, the conversion.
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公开(公告)号：US20220094987A1
公开(公告)日：2022-03-24
申请号：US17540980
申请日：2021-12-02
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Zhipin DENG , Yang WANG , Yue WANG
IPC: H04N19/61 , H04N19/625 , H04N19/105 , H04N19/132 , H04N19/159 , H04N19/176
Abstract: Devices, systems and methods for digital video coding, which includes using multiple transforms, are described. In a representative aspect, a method for video processing includes making a decision, based on one or more decoded coefficients and in an absence of one or more transform indices, regarding an application of a transform to a current block of a video, and performing, based on the decision, a conversion between the current block and a bitstream representation of the video.
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公开(公告)号：US20220094986A1
公开(公告)日：2022-03-24
申请号：US17540089
申请日：2021-12-01
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/61 , H04N19/70 , H04N19/46 , H04N19/176
Abstract: Devices, systems and methods for digital video process are described. An exemplary method for video processing includes performing a conversion between a current video block of a video and a coded representation of the video, wherein the performing of the conversion includes determining, based on a width (W) and/or a height (H) of the current video block, an applicability of a secondary transform tool to the current video block, and wherein the secondary transform tool includes applying, during encoding, a forward secondary transform to an output of a forward primary transform applied to a residual of a video block prior to quantization, or applying, during decoding, an inverse secondary transform to an output of dequantization of the video block before applying an inverse primary transform.
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公开(公告)号：US20220094927A1
公开(公告)日：2022-03-24
申请号：US17541038
申请日：2021-12-02
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/119 , H04N19/176 , H04N19/159 , H04N19/139 , H04N19/186 , H04N19/105 , H04N19/593
Abstract: A method of video processing includes determining, for a conversion between a current block of a video and a bitstream of the video, that the current block is split into multiple sub-blocks, wherein at least one of the multiple blocks is coded using a modified intra-block copy (IBC) coding technique that uses reference samples from one or more video regions from a current picture of the current block; and performing the conversion based on the determining.
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Patent Agency Ranking
公开(公告)号：US20220094917A1
公开(公告)日：2022-03-24
申请号：US17541069
申请日：2021-12-02
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/107 , H04N19/176 , H04N19/117 , H04N19/119
Abstract: A method of video processing includes determining, for a conversion between a current block of a video and a bitstream of the video, that the current block is split into multiple sub-blocks, wherein each of the multiple sub-blocks is coded in the bitstream using a corresponding coding technique according to a pattern, and performing the conversion based on the determining.
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公开(公告)号：US20220070490A1
公开(公告)日：2022-03-03
申请号：US17523232
申请日：2021-11-10
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/563 , H04N19/513 , H04N19/176 , H04N19/132 , H04N19/105 , H04N19/159
Abstract: A video processing method is provided to include determining, for a current video block of a video, a final prediction block for the current video block by refining one or more initial predictions for the current video block using an optical flow calculation based on a gradient of initial prediction samples according to a precision rule; and performing a conversion between the current video block and a coded representation using the final prediction block, wherein the optical flow calculation includes a prediction refinement with optical flow (PROF) procedure or a bi-directional optical flow (BDOF) procedure, wherein the precision rule specifies to use a same precision for representing the gradient for both the PROF procedure and the BDOF procedure.
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公开(公告)号：US20220060692A1
公开(公告)日：2022-02-24
申请号：US17519310
申请日：2021-11-04
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/105 , H04N19/176 , H04N19/51
Abstract: A video processing method is provided to include determining, for a conversion between a current video block of a current picture of a video and a coded representation of the video, that use of a coding tool is disabled for the current video block due to use of a reference picture having a dimension different from a dimension of the current picture for coding of the current video block into the coded representation; and performing the conversion based on the determining.
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公开(公告)号：US20220038706A1
公开(公告)日：2022-02-03
申请号：US17502258
申请日：2021-10-15
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/132 , H04N19/105 , H04N19/159 , H04N19/176
Abstract: Techniques, devices, and systems for video processing are described. In one example aspect, a video processing method includes determining, for a conversion between a block of a video and a bitstream representation of the video, a manner in which information for a Matrix-based Intra Prediction (MIP) coding technique is coded in the bitstream representation. A prediction block of the block is determined using the MIP coding technique based on performing a matrix vector multiplication operation on previously coded samples of the video. The method also includes performing the conversion based on the determining.
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公开(公告)号：US20220030267A1
公开(公告)日：2022-01-27
申请号：US17487200
申请日：2021-09-28
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/52 , H04N19/105 , H04N19/117 , H04N19/176 , H04N19/184 , H04N19/186 , H04N19/132 , H04N19/159 , H04N19/30 , H04N19/70
Abstract: A method for video processing is provided to include: performing a conversion between a current video block of a video that is a chroma block and a coded representation of the video, wherein, during the conversion, the current video block is constructed based on a first domain and a second domain, and wherein the conversion further includes applying a forward reshaping process and/or an inverse reshaping process to one or more chroma components of the current video block.
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