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公开(公告)号:US20210092435A1
公开(公告)日:2021-03-25
申请号:US17109821
申请日:2020-12-02
Inventor: Hongbin LIU , Li ZHANG , Kai ZHANG , Yue WANG
IPC: H04N19/52 , H04N19/176 , H04N19/184 , H04N19/577
Abstract: Devices, systems and methods for digital video coding, which include decoder side motion vector derivation (DMVD) tools, are described. An exemplary method for video processing includes making a decision, based on a determination that a current block of a video is coded using a multi-hypothesis prediction mode, regarding a selective enablement of a DMVD tool for the current block, wherein the DMVD tool derives a refinement of motion information signaled in a bitstream representation of the video; and performing, based on the decision, a conversion between the current block and the bitstream representation.
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公开(公告)号:US20210092431A1
公开(公告)日:2021-03-25
申请号:US16951137
申请日:2020-11-18
Inventor: Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/513 , H04N19/176 , H04N19/105 , H04N19/573
Abstract: Methods, systems, and devices related to sub-block based motion prediction in video coding are described. In one representative aspect, a video processing method includes partitioning a video block into a first set of sub-blocks according to a first pattern, partitioning the video block into a second set of sub-blocks according to a second pattern, wherein at least one sub-block in the second set has a different size than a sub-block in the first set, and determining a prediction block corresponding to a combination of a first intermediate prediction block that is predictively generated from the first set of sub-blocks and a second intermediate prediction block that is predictively generated from the second set of sub-blocks.
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公开(公告)号:US20210092378A1
公开(公告)日:2021-03-25
申请号:US17110009
申请日:2020-12-02
Inventor: Li ZHANG , Kai ZHANG , Hongbin LIU , Hsiao Chiang CHUANG , Yue WANG
IPC: H04N19/119 , H04N19/189 , H04N19/176
Abstract: Methods, systems and devices for using flexible and efficient partitioning techniques, and in particular, sub-block shapes in extended quadtree partitioning, are described. An exemplary method for visual media decoding includes applying, to a current visual media block, a partitioning process that splits the current visual media block into exactly four sub-blocks including at least one sub-block that has a size different from half of a width of the current visual media block times half of a height of the current visual media block, where a size of the current visual media block is M×N, and the size of the at least one sub-block is based on a minimum value between M and N, or a maximum value between M and N; decoding, based on a bitstream representation, the four sub-blocks; and decoding, based on the four sub-blocks and the partitioning process, the current visual media block.
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公开(公告)号:US20210092366A1
公开(公告)日:2021-03-25
申请号:US17117558
申请日:2020-12-10
Inventor: Hongbin LIU , Li ZHANG , Kai ZHANG , Yue WANG
IPC: H04N19/105 , H04N19/137 , H04N19/30
Abstract: Video coding and decoding in which the bitstream is generated using affine motion compensation mode are described. One example includes generating, for a reconstruction of a current video unit, a list of affine motion vector prediction candidates in which each candidate in the list is calculated without using a clipping operation, wherein the clipping operation limits a magnitude of the candidate motion vectors to a limit; and performing the reconstruction of the current video unit using the list of affine motion vector prediction candidates.
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公开(公告)号:US20210076043A1
公开(公告)日:2021-03-11
申请号:US17102274
申请日:2020-11-23
Inventor: Li ZHANG , Hongbin LIU , Kai ZHANG , Yue WANG
IPC: H04N19/136 , H04N19/70 , H04N19/60 , H04N19/176
Abstract: A video processing method includes checking, during a conversion from a coded representation of a current video block to the current video block, a position of a last non-zero coefficient of the current video block, wherein the position is relative to a top-left position of the current video block; and performing a determination, based on the position, whether or not to parse a syntax element which signals a transform information in the coded representation.
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公开(公告)号:US20210029356A1
公开(公告)日:2021-01-28
申请号:US17071412
申请日:2020-10-15
Inventor: Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/119 , H04N19/176 , H04N19/52 , H04N19/136 , H04N19/186
Abstract: Devices, systems and methods for sub-block based prediction are described. In a representative aspect, a method for video processing includes partitioning a first component of a current video block into a first set of sub-blocks and partitioning a second component of the current video block into a second set of sub-blocks. A sub-block of the second component corresponds to one or more sub-blocks of the first component. The method also includes deriving, based on a color format of the current video block, motion vectors for a sub-block of the second component based on motion vectors for one or more corresponding sub-blocks of the first color component.
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公开(公告)号:US20210021811A1
公开(公告)日:2021-01-21
申请号:US17031049
申请日:2020-09-24
Inventor: Jizheng XU , Kai ZHANG , Li ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/105 , H04N19/176 , H04N19/159 , H04N19/139
Abstract: The application relates to an independent construction method for block vector list in intra block copy mode. A method of video processing is disclosed. The method of video processing includes: determining, during a first conversion between a first video block of a video and a bitstream representation of the video, a first candidate list construction method for the first video block with a first coding mode; performing, at least based on a first candidate list acquired according to the first candidate list construction method, the first conversion; wherein the conversion of the first video block is based on samples in current picture, and the first candidate list construction method is different from a second candidate list construction method which is applied, during a second conversion between a second video block with a second coding mode of the video and the bitstream representation of the video, on the second video block.
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公开(公告)号:US20210006819A1
公开(公告)日:2021-01-07
申请号:US17031322
申请日:2020-09-24
Inventor: Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/513 , H04N19/184 , H04N19/96 , H04N19/70 , H04N19/186
Abstract: Devices, systems and methods for encoding and decoding digital video using historical information containing coding candidates are described. In a representative aspect, a method for video processing includes maintaining one or more tables of motion candidates during a conversion between a current video block and a bitstream representation of a video, comparing a motion candidate associated with the current video block with a number of entries in the one or more tables, and updating the one or more tables based on the comparing.
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公开(公告)号:US20210006787A1
公开(公告)日:2021-01-07
申请号:US17019581
申请日:2020-09-14
Inventor: Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/119 , H04N19/139 , H04N19/58 , H04N19/513 , H04N19/176
Abstract: The disclosure relates to table maintenance for HMVP candidate storage. A method for processing video, comprising: determining, during a conversion between a first block of visual media data and a corresponding coded representation of the visual media data, the first block being coded with geometry partition mode; determining, based on at least one table storing history based motion vector prediction (HMVP) candidates which include motion information based on previously coded blocks, motion information of at least one sub-portion of the first block; performing the conversion of the first block using the determined motion information.
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公开(公告)号:US20200382770A1
公开(公告)日:2020-12-03
申请号:US16998296
申请日:2020-08-20
Inventor: Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/105 , H04N19/137 , H04N19/70 , H04N19/176 , H04N19/184 , H04L29/06
Abstract: A method of video decoding includes maintaining a number of tables, wherein each table includes a set of motion candidates, wherein each motion candidate is associated with corresponding motion information derived from previously video blocks, performing a conversion between a video block and a coded representation of the video block, and determining, based on a conversion condition of the video block, whether to update at least one of the tables by adding motion information corresponding to the video block.
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