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公开(公告)号：US20220132106A1
公开(公告)日：2022-04-28
申请号：US17570723
申请日：2022-01-07
发明人： Jizheng XU , Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/105 , H04N19/176 , H04N19/159
摘要： A method of processing visual media includes performing a conversion between a current video block of a current picture of a visual media data and a bitstream representation of the visual media data using a buffer comprising reference samples from the current picture for derivation of a prediction block of the current video block. The conversion is based according to rule which specifies that, for the bitstream representation to conform the rule, a reference sample in the buffer is to satisfy a bitstream conformance constraint.
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公开(公告)号：US20220124341A1
公开(公告)日：2022-04-21
申请号：US17646196
申请日：2021-12-28
发明人： Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/132 , H04N19/105 , H04N19/117 , H04N19/176 , H04N19/186 , H04N19/30 , H04N19/80
摘要： Devices, systems and methods for digital video coding, which includes simplified cross-component prediction, are described. In a representative aspect, a method for video coding includes receiving a bitstream representation of a current block of video data including at least one luma component and at least one chroma component, predicting, using a linear model, a first set of samples of the at least one chroma component based on a second set of samples that is selected by sub-sampling samples of the at least one luma component, and processing, based on the first and second sets of samples, the bitstream representation to generate the current block. In another representative aspect, the second set of samples are neighboring samples of the current block and are used for an intra prediction mode of the at least one luma component.
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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
发明人： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC分类号： H04N19/61 , H04N19/159 , H04N19/186 , H04N19/176
摘要： 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
发明人： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC分类号： H04N19/513 , H04N19/137 , G06F7/499 , G06F5/01 , H04N19/176 , H04N19/105
摘要： 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
发明人： Kai ZHANG , Li ZHANG , Hongbin LIU , Zhipin DENG , Yang WANG , Yue WANG
IPC分类号： H04N19/61 , H04N19/625 , H04N19/105 , H04N19/132 , H04N19/159 , H04N19/176
摘要： 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
发明人： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/61 , H04N19/70 , H04N19/46 , H04N19/176
摘要： 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
发明人： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/119 , H04N19/176 , H04N19/159 , H04N19/139 , H04N19/186 , H04N19/105 , H04N19/593
摘要： 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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公开(公告)号：US20220094917A1
公开(公告)日：2022-03-24
申请号：US17541069
申请日：2021-12-02
发明人： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/107 , H04N19/176 , H04N19/117 , H04N19/119
摘要： 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
发明人： Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/563 , H04N19/513 , H04N19/176 , H04N19/132 , H04N19/105 , H04N19/159
摘要： 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
发明人： Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC分类号： H04N19/105 , H04N19/176 , H04N19/51
摘要： 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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