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公开(公告)号：US20220070455A1
公开(公告)日：2022-03-03
申请号：US17524477
申请日：2021-11-11
Inventor： Li ZHANG , Weijia ZHU , Kai ZHANG , Hongbin LIU , Jizheng XU
IPC: H04N19/117 , H04N19/82 , H04N19/132 , H04N19/169 , H04N19/159 , H04N19/176
Abstract: In an exemplary aspect, a method for visual media processing includes determining whether a pair of adjacent blocks of visual media data are both intra block copy (IBC) coded; and selectively applying, based on the determination, a deblocking filter (DB) process by identifying a boundary at a vertical edge and/or a horizontal edge of the pair of adjacent blocks, calculating a boundary strength of a filter, deciding whether to turn on or off the filter, and selecting a strength of the filter in case the filter is turned on, wherein the boundary strength of the filter is dependent on a motion vector difference between motion vectors associated with the pair of adjacent blocks.
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公开(公告)号：US20220070454A1
公开(公告)日：2022-03-03
申请号：US17523131
申请日：2021-11-10
Inventor： Li ZHANG , Weijia ZHU , Kai ZHANG , Hongbin LIU , Jizheng XU
IPC: H04N19/117 , H04N19/82 , H04N19/132 , H04N19/159 , H04N19/176
Abstract: In an exemplary aspect, a method for visual media processing includes identifying a boundary at a vertical edge and/or a horizontal edge of two video blocks; calculating a boundary strength of a filter based on at least one of the two video blocks crossing a vertical edge or a horizontal edge is coded using a combined intra-inter prediction (CIIP) mode; deciding whether to turn on or off the filter; selecting a strength of the filter in case the filter is turned on; and performing, based on the selecting, a deblocking filter (DB) process to the video blocks.
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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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Patent Agency Ranking
公开(公告)号：US20210385439A1
公开(公告)日：2021-12-09
申请号：US17399904
申请日：2021-08-11
Applicant: Bytedance Inc.
Inventor： Weijia ZHU , Li ZHANG , Jizheng XU
IPC: H04N19/105 , H04N19/46 , H04N19/96 , H04N19/176
Abstract: Devices, systems and methods for coefficient coding in transform skip mode are described. An exemplary method for video processing includes determining, for encoding one or more video blocks in a video region of a visual media data into a bitstream representation of the visual media data, a maximum allowed dimension up to which a current video block of the one or more video blocks is allowed to be encoded using a transform skip mode such that a residual of a prediction error between the current video block and a reference video block is represented in the bitstream representation without applying a transform; and including a syntax element indicative of the maximum allowed dimension in the bitstream representation.
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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：US20210360243A1
公开(公告)日：2021-11-18
申请号：US17389157
申请日：2021-07-29
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/119 , H04N19/176 , H04N19/184 , H04N19/136 , H04N19/186 , H04N19/172 , H04N19/157
Abstract: A method for processing a video includes determining characteristics regarding a current video block; determining an operational state regarding unsymmetrical quad-tree (UQT) splitting based on the determination of the characteristics, wherein the operational state indicates that whether the UQT splitting is enabled or disabled and/or indicates how to split the current video block into four partitions using the UQT splitting; and performing a conversion between the current video block and a bitstream representation of the current video block based on the operational state of UQT splitting.
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公开(公告)号：US20210352315A1
公开(公告)日：2021-11-11
申请号：US17380310
申请日：2021-07-20
Inventor： Kai ZHANG , Li ZHANG , Hongbin LIU , Jizheng XU , Yue WANG
IPC: H04N19/52 , H04N19/176 , H04N19/423 , H04N19/105
Abstract: Multi-HMVP for affine is described. In an exemplary aspect, a method for video processing includes deriving, for a conversion between a current block of video and a bitstream representation of the current block, an affine model for the current block based on affine related information stored in at least one history motion vector prediction (HMVP) buffer of multiple HMVP buffers, the multiple HMVP buffers being used to store affine related information of blocks coded prior the current block in different categories; and performing the conversion by using the derived affine model.
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公开(公告)号：US20210329290A1
公开(公告)日：2021-10-21
申请号：US17360868
申请日：2021-06-28
Inventor： Jizheng XU , Jiahao LI , Weijia ZHU , Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/537 , H04N19/513 , H04N19/147 , H04N19/105 , H04N19/176
Abstract: Methods, systems and device for hash-based motion estimation in video coding are described. An exemplary method of video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video, motion information associated with the current block using a hash-based motion search, a size of the current block being M×N, M and N being positive integers and M being not equal to N, applying, based on the motion information and a video picture comprising the current block, a prediction for the current block, and performing, based on the prediction, the conversion.
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