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公开(公告)号：US20220038705A1
公开(公告)日：2022-02-03
申请号：US17494305
申请日：2021-10-05
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/132 , H04N19/30 , H04N19/184 , H04N19/70 , H04N19/176
Abstract: A video processing method is provided to include performing a conversion between a coded representation of a video comprising one or more video regions and the video, wherein the coded representation includes a first side information at a first level, and wherein a second side information at a second level is derived from the first side information such that the second side information provides parameters for a video unit coded with in-loop reshaping (ILR) in which a reconstruction of the video unit of a video region is based on a representation of a video unit in a first domain and a second domain and/or scaling chroma residue of a chroma video unit.
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公开(公告)号：US20220007050A1
公开(公告)日：2022-01-06
申请号：US17476637
申请日：2021-09-16
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/577 , H04N19/184 , H04N19/176 , H04N19/132 , H04N19/139 , H04N19/52 , H04N19/107
Abstract: A method of video processing includes determining a refined prediction sample P′(x,y) at a position (x,y) in a video block by modifying a prediction sample P(x,y) at the position (x,y) with a first gradient component Gx(x, y) in a first direction estimated at the position (x,y) and a second gradient component Gy(x, y) in a second direction estimated at the position (x,y) and a first motion displacement Vx(x,y) estimated for the position (x,y) and a second motion displacement Vy(x,y) estimated for the position (x,y), where x and y are integer numbers, and performing a conversion between the video block and a bitstream representation of the video block using a reconstructed sample value Rec(x,y) at the position (x,y) that is obtained based on the refined prediction sample P′(x,y) and a residue sample value Res(x,y).
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公开(公告)号：US20220007029A1
公开(公告)日：2022-01-06
申请号：US17479360
申请日：2021-09-20
Inventor： Zhipin DENG , Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU
IPC: H04N19/132 , H04N19/105 , H04N19/159 , H04N19/176 , G06F17/16 , G06F7/78
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 previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and followed by an upsampling operation, where the upsampling operation is performed, in both a vertical direction and a horizontal direction in a fixed order, on samples obtained from the matrix vector multiplication operation.
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公开(公告)号：US20210392367A1
公开(公告)日：2021-12-16
申请号：US17461530
申请日：2021-08-30
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/52 , H04N19/176 , H04N19/139 , H04N19/186
Abstract: A method of video processing includes determining a first motion displacement Vx(x,y) at a position (x,y) and a second motion displacement Vy(x,y) at the position (x,y) in a video block coded using an optical flow based method, wherein x and y are fractional numbers, where Vx(x,y) and Vy(x,y) are determined based at least on the position (x,y) and a center position of a basic video block of the video block, and performing a conversion between the video block and a bitstream representation of the current video block using the first motion displacement and the second motion displacement.
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公开(公告)号：US20210385500A1
公开(公告)日：2021-12-09
申请号：US17405304
申请日：2021-08-18
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/70 , H04N19/46 , H04N19/30 , H04N19/132 , H04N19/186 , H04N19/17
Abstract: Devices, systems and methods related to management of syntax flags with respect chroma formats in video processing are described. In one representative aspect, a video decoding method includes determining, based on a chroma format of a video comprising a region, whether one or more syntax flags applicable to the region of the video are absent in a syntax structure of a coded representation of the video. The one or more syntax flags are indicative of usage of a luma-dependent chroma residue scaling coding step for representing the region in the coded representation. The luma-dependent chroma residue scaling coding step comprises a scaling process in which a scaling coefficient is derived based on reconstructed luma samples and the scaling process is applied to a chroma residue. The method also includes generating one or more decoded video blocks of the video region by parsing the coded representation according to the determining.
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Patent Agency Ranking
公开(公告)号：US20210385498A1
公开(公告)日：2021-12-09
申请号：US17400320
申请日：2021-08-12
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/70 , H04N19/46 , H04N19/186 , H04N19/176
Abstract: Devices, systems and methods related to digital video coding, and specifically, to management of syntax flags with respect chroma formats are described. In one representative aspect, the disclosed technology may be used to provide a method for video decoding. The method includes determining a chroma format associated with a region of a video and determining, based on the chroma format, whether one or more syntax flags applicable to the region of the video are included in a syntax structure of a coded representation of the video. The one or more syntax flags are indicative of a joint chroma residual coding step for representing the region in the coded representation. The method also includes generating one or more decoded video blocks of the region by parsing the coded representation according to a presence or an absence of the one or more syntax flags in the coded representation.
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公开(公告)号：US20210385446A1
公开(公告)日：2021-12-09
申请号：US17399839
申请日：2021-08-11
Inventor： Hongbin LIU , Li ZHANG , Kai ZHANG , Hsiao Chiang CHUANG , Zhipin DENG
IPC: H04N19/117 , H04N19/70 , H04N19/176 , H04N19/132
Abstract: Devices, systems and methods for adaptive loop filtering are described. In an exemplary aspect, a method for video processing includes performing, for a current video block of a video, a filtering process that uses filter coefficients and comprises two or more operations with at least one intermediate result, applying a clipping operation to the at least one intermediate result, and performing, based on the at least one intermediate result, a conversion between the current video block and a bitstream representation of the video, wherein the at least one intermediate result is based on a weighted sum of the filter coefficients and differences between a current sample of the current video block and neighboring samples of the current sample.
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公开(公告)号：US20210377530A1
公开(公告)日：2021-12-02
申请号：US17401462
申请日：2021-08-13
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/119 , H04N19/176 , H04N19/96
Abstract: Non-power-two-partition tree in video compression is described. In an exemplary aspect, a method for video processing includes determining, for a conversion between a first block of video and a bitstream representation of the first block of video, whether a use of non-power-of-two partition trees (NPT-T) is enabled or disabled, wherein the NPT-T includes splitting the first block to multiple smaller sized child blocks of the first block, and at least one child block's width and/or height have a dimension that is a non-power-of-two integer; and performing the conversion based on the NPT-T in response to the determination that the NPT-T is enabled.
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公开(公告)号：US20210377521A1
公开(公告)日：2021-12-02
申请号：US17403670
申请日：2021-08-16
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/105 , H04N19/159 , H04N19/176 , H04N19/189 , H04N19/52 , H04N19/17
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：US20210368199A1
公开(公告)日：2021-11-25
申请号：US17392778
申请日：2021-08-03
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/513 , H04N19/137 , H04N19/132 , H04N19/159 , H04N19/176
Abstract: A video processing method is disclosed to include: determining that a coding mode of a current video block is an affine mode; determining, for the current video block, an applicability mode of a prediction refinement optical flow (PROF) procedure with the affine mode according to a rule that specifies a condition for applying the PROF procedure; and performing, based on the determining, a conversion between the current video block and a coded representation of the video; wherein, during the PROF procedure, one or more initial predictions for the current video block are computed at a sub-block level and refined using an optical flow calculation.
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