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公开(公告)号：US20220159259A1
公开(公告)日：2022-05-19
申请号：US17585788
申请日：2022-01-27
Inventor： Kui FAN , Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/13 , H04N19/96 , H04N19/60 , H04N19/176 , H04N19/70
Abstract: A video processing method is described. The method includes performing a conversion between a video region of a video and a coded representation of the video, wherein the performing of the conversion includes configuring, based on a partition type of the video region, a context model for coding a first bin, the first bin and a second bin included in a bin string corresponding to an index of a secondary transform tool, wherein the index indicates an applicability of the secondary transform tool and/or a kernel information of the secondary transform tool, 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 to the video block before applying an inverse primary transform.
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公开(公告)号：US20220159255A1
公开(公告)日：2022-05-19
申请号：US17589483
申请日：2022-01-31
Inventor： Jizheng XU , Zhipin DENG , Li ZHANG , Hongbin LIU
IPC: H04N19/119 , H04N19/96 , H04N19/132 , H04N19/159 , H04N19/186 , H04N19/176
Abstract: A method of video processing is provided to include: performing a conversion between a video comprising one or more video regions comprising one or more luma blocks and one or more chroma blocks and a coded representation of the video according to a rule; wherein the rule specifies that a chroma block from the one or more chroma blocks having a size M×N is disallowed to be represented in the coded representation using an intra mode or an intra block copy mode, wherein M and N are integers that indicate a width and a height of the chroma block, respectively; wherein the intra mode includes encoding the chroma block based on previously encoded or reconstructed video blocks, and wherein the intra block copy mode includes encoding the chroma block using at least a block vector pointing to a video frame containing a video region.
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公开(公告)号：US20220150544A1
公开(公告)日：2022-05-12
申请号：US17582739
申请日：2022-01-24
Inventor： Zhipin DENG , Li ZHANG , Kai ZHANG , Hongbin LIU
IPC: H04N19/61 , H04N19/176 , H04N19/167 , H04N19/119 , H04N19/109 , H04N19/70 , H04N19/11 , H04N19/107
Abstract: Methods, systems, and devices for coding or decoding video wherein the picture partition mode is based on block size are described. An example method for video processing includes using a dimension of a virtual pipeline data unit (VPDU) used for a conversion between a video comprising one or more video regions comprising one or more video blocks and a bitstream representation of the video to perform a determination of whether a ternary-tree (TT) or a binary tree (BT) partitioning of a video block of the one or more video blocks is enabled, and performing, based on the determination, the conversion, wherein the dimension is equal to VSize in luma samples, wherein dimensions of the video block are CtbSizeY in luma samples, wherein VSize=min(M, CtbSizeY), and wherein M is a positive integer.
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公开(公告)号：US20220150508A1
公开(公告)日：2022-05-12
申请号：US17579994
申请日：2022-01-20
Inventor： Hongbin LIU , Li ZHANG , Kai ZHANG , Yue WANG
IPC: H04N19/139 , H04N19/105 , H04N19/176 , H04N19/189
Abstract: Devices, systems and methods for digital video coding, which includes restrictions on decoder-side motion vector derivation based on coding information, are described. An exemplary method for video processing includes making a decision, for a conversion between a current block of a video and a bitstream representation of the video, regarding a selective enablement of a decoder side motion vector derivation (DMVD) tool for the current block, the DMVD tool deriving a refinement of motion information signaled in the bitstream representation, and the conversion using a merge mode and motion vector differences that are indicated by a motion direction and a motion magnitude, 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：US20220150498A1
公开(公告)日：2022-05-12
申请号：US17585718
申请日：2022-01-27
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/12 , H04N19/124 , H04N19/593 , H04N19/159 , H04N19/186 , H04N19/61 , H04N19/176
Abstract: A method of video processing is described. The method includes making a first determination, for a chroma block of a video, whether a non-normal chroma intra prediction mode is applied to the chroma block of a video; making a second determination, for a luma block corresponding to the chroma block, that a luma intra prediction mode is applied to the luma block; making a third determination that a transform set or a transform matrix is applied to the chroma block based on the luma intra prediction mode; and performing a conversion between the video and a coded representation of the video according to the third determination, and wherein the non-normal chroma intra prediction mode comprises coding the chroma block without using extrapolated neighboring pixel values along a chroma prediction direction.
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Patent Agency Ranking
公开(公告)号：US11323741B2
公开(公告)日：2022-05-03
申请号：US17392719
申请日：2021-08-03
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：US11323719B2
公开(公告)日：2022-05-03
申请号：US17343980
申请日：2021-06-10
Inventor： Zhipin Deng , Kai Zhang , Li Zhang , Hongbin Liu , Jizheng Xu
IPC: H04N19/00 , H04N19/132 , H04N19/105 , H04N19/159 , H04N19/176 , H04N19/12 , H04N19/60 , H04N19/117 , H04N19/70 , H04N19/82 , H04N19/186
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 first determination that a luma video block of a video is coded using a matrix based intra prediction (MIP) mode in which a prediction block of the luma 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 selectively followed by an upsampling operation, performing, based on the first determination, a second determination about a chroma intra mode to be used for a chroma video block associated with the luma video block, and performing, based on the second determination, a conversion between the chroma video block and a bitstream representation of the chroma video block.
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公开(公告)号：US20220132117A1
公开(公告)日：2022-04-28
申请号：US17570682
申请日：2022-01-07
Inventor： Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/117 , H04N19/96 , H04N19/82 , H04N19/176 , H04N19/14 , H04N19/132
Abstract: A method of video processing includes determining a classification of samples of a block in a video picture of a video according to a rule, wherein the video picture is divided into multiple regions, and wherein the rule disallows use of neighboring samples of a current sample across one or more boundaries of the multiple regions for the classification. The one or more boundaries of the multiple regions comprises a virtual boundary for an adaptive loop filtering (ALF) process. The method also includes performing a conversion between the block and a bitstream representation of the video by selectively applying the ALF process according to the classification.
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公开(公告)号：US20220132111A1
公开(公告)日：2022-04-28
申请号：US17568471
申请日：2022-01-04
Inventor： Hongbin LIU , Li ZHANG , Kai ZHANG , Jizheng XU , Yue WANG
IPC: H04N19/117 , H04N19/176 , H04N19/132 , H04N19/523 , H04N19/80
Abstract: A method of video processing is described. The method includes determining, for a conversion between a current video block of a current picture of a video and a coded representation of the video, an applicability of an alternative interpolation filter, wherein the applicability of the alternative interpolation filter indicates whether to apply the alternative interpolation filter in the conversion; and performing the conversion based on the determining; wherein the applicability of the alternative interpolation filter is determined based on whether a reference picture resampling in which a reference picture of the current picture is resampled to perform the conversion is used.
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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
Inventor： Jizheng XU , Li ZHANG , Kai ZHANG , Hongbin LIU , Yue WANG
IPC: H04N19/105 , H04N19/176 , H04N19/159
Abstract: 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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