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公开(公告)号：US11516467B2
公开(公告)日：2022-11-29
申请号：US17384246
申请日：2021-07-23
Inventor： Jizheng Xu , Li Zhang , Kai Zhang , Hongbin Liu , Yue Wang
IPC: H04N19/176 , H04N19/423 , H04N19/593 , H04N19/105
Abstract: A method of visual media processing includes determining, for a conversion between a current video block of visual media data and a bitstream representation of the current video block, a buffer that stores reference samples for prediction in an intra block copy mode; for a sample spatially located at location of the current video block relative to an upper-left position of a coding tree unit including the current video block and having a block vector, computing a corresponding reference in the buffer at a reference location, wherein the reference location is determined using the block vector and the location; and upon determining that the reference location lies outside the buffer, re-computing the reference location based at least in part on a location of the current video block relative to the coding tree unit including the current video block.
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公开(公告)号：US20220377382A1
公开(公告)日：2022-11-24
申请号：US17860634
申请日：2022-07-08
Applicant: Bytedance Inc.
Inventor： Ye-kui Wang , Li Zhang , Kai Zhang
Abstract: A method of video processing includes performing a conversion between a video including one or more pictures and a bitstream of the video, wherein the bitstream conforms to a format rule, wherein the format rule conditionally allows coding of a picture in one layer using reference pictures from other layers based on a first syntax element indicating whether the reference pictures from the other layers are present in the bitstream, and wherein the first syntax element is conditionally signaled in the bitstream based on a second syntax element that indicates whether an identifier of a parameter set associated with the picture is not equal to zero.
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公开(公告)号：US20220377367A1
公开(公告)日：2022-11-24
申请号：US17873917
申请日：2022-07-26
Inventor： Hongbin Liu , Li Zhang , Kai Zhang , Yang Wang , Jizheng Xu , Yue Wang
IPC: H04N19/513 , H04N19/577
Abstract: Motion compensation along different directions is disclosed. A method for video processing including: determining, for a conversion between a current video block of a video and a bitstream representation of the current video block, optical flow associated with the current video block in an optical flow-based motion refinement process or prediction process, wherein the optical flow is derived along directions that are different from a horizontal direction and/or a vertical direction; and performing the conversion based on the optical flow.
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公开(公告)号：US11509941B2
公开(公告)日：2022-11-22
申请号：US17354282
申请日：2021-06-22
Inventor： Li Zhang , Kai Zhang , Hongbin Liu , Yue Wang
IPC: H04N19/82 , H04N19/117 , H04N19/174 , H04N19/176 , H04N19/96 , H04N19/17
Abstract: Devices, systems and methods for video processing are described. In an exemplary aspect, a method for video processing includes performing a conversion between a coded representation of a video comprising one or more video regions and the video. The coded representation includes first side information that provides a clipping parameter for filtering a reconstruction of a video unit of a video region using a non-linear adaptive loop filter, and wherein the first side information is signaled together with second side information indicative of filter coefficients used in the non-linear adaptive loop filter.
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公开(公告)号：US11509929B2
公开(公告)日：2022-11-22
申请号：US17225433
申请日：2021-04-08
Inventor： Hongbin Liu , Li Zhang , Kai Zhang , Yue Wang
IPC: H04N19/119 , H04N19/105 , H04N19/577 , H04N19/176 , H04N19/186 , H04N19/593 , H04N19/117 , H04N19/513 , H04N19/132
Abstract: A method for video processing includes: refining motion information of a video block by using a multi-step refinement processing, multiple refined motion vectors (MVs) of the video block being derived iteratively in respective steps of the multi-step refinement processing, and performing a video processing on the video block based on the multiple refined MVs of the video block.
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Patent Agency Ranking
公开(公告)号：US11503293B2
公开(公告)日：2022-11-15
申请号：US17675756
申请日：2022-02-18
Inventor： Li Zhang , Kai Zhang , Jizheng Xu , Hongbin Liu , Yue Wang
IPC: H04N19/12 , H04N19/176 , H04N19/60 , H04N19/18 , H04N19/48
Abstract: A video processing method includes determining, for a conversion between a current block of a video and a bitstream representation of the video, whether to enable a level mapping operation or a level remapping operation based on a rule, wherein the level mapping operation or the level remapping operation includes changing between a first representation of a residual coefficient of the current block and a second representation of the residual coefficient of the current block based on neighboring residual coefficients of the residual coefficient; and performing the conversion by selectively using the level mapping operation or the level remapping operation based on the determining.
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公开(公告)号：US11496733B2
公开(公告)日：2022-11-08
申请号：US17520975
申请日：2021-11-08
Inventor： Kai Zhang , Li Zhang , Hongbin Liu , Yue Wang
IPC: H04N19/109 , H04N19/139 , H04N19/46 , H04N19/52 , H04N19/105 , H04N19/157 , H04N19/176 , H04N19/513
Abstract: A method of visual media processing includes determining whether to use an affine adaptive motion vector resolution (AMVR) technique on visual media data relying on a control information related to the affine AMVR technique in a bitstream representation of the visual media data, wherein the control information is included or excluded from the bitstream representation based on a rule; and performing a conversion between the visual media data and the bitstream representation of the visual media data.
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公开(公告)号：US11490098B2
公开(公告)日：2022-11-01
申请号：US17538062
申请日：2021-11-30
Inventor： Kai Zhang , Li Zhang , Hongbin Liu , Yue Wang
IPC: H04N19/186 , H04N19/119 , H04N19/146 , H04N19/157 , H04N19/176 , H04N19/593 , H04N19/70
Abstract: An exemplary method for visual media processing includes performing a conversion between a current video block of a visual media data and a bitstream representation of the visual media data in accordance with a conditional signaling rule, wherein the current video block is disabled from using an intra sub-block partitioning (ISP) split mode which divides the current video block into sub-blocks depending on dimensions of the current video block, wherein, in case that the conversion is associated with disabling use of the ISP split mode, the conditional signaling rule specifies selectively including in the bitstream representation a first syntax element indicating that a luma component of a sub-block of the current video block includes non-zero coefficient values, and further wherein the selectively including is based at least on one or more other syntax elements having non-zero coefficient values of one or more previous sub-blocks included in the bitstream representation.
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公开(公告)号：US11483583B2
公开(公告)日：2022-10-25
申请号：US17405374
申请日：2021-08-18
Inventor： Hongbin Liu , Li Zhang , Kai Zhang , Jizheng Xu , Yue Wang
IPC: H04N19/513 , H04N19/105 , H04N19/132 , H04N19/159 , H04N19/176
Abstract: Devices, systems and methods for sample refinement and filtering method for video coding are described. In an exemplary aspect, a method for video processing includes modifying, for a conversion between a block of a video and a bitstream representation of the video, a refinement value for a prediction sample in the block by applying a clipping operation to refinement value. The refinement value is derived based on a gradient value of an optical flow coding process. An output of the clipping operation is within a range. The method also includes refining the prediction sample based on the refinement value and performing the conversion based on the refined prediction sample.
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公开(公告)号：US11470331B2
公开(公告)日：2022-10-11
申请号：US17154680
申请日：2021-01-21
Inventor： Kai Zhang , Li Zhang , Hongbin Liu , Jizheng Xu , Yue Wang
IPC: H04N19/107 , H04N19/159 , H04N19/105 , H04N19/96 , H04N19/176 , H04N19/186 , H04N19/577 , H04N19/117
Abstract: Techniques for implementing video processing techniques are described. In one example implementation, a method of video processing includes determining, for a conversion between a current block of a video coded using a combined inter and intra prediction (CIIP) coding technique and a bitstream representation of the video, an intra-prediction mode of the current block independently from an intra-prediction mode of a neighboring block. The CIIP coding technique uses an intermedia inter prediction value and an intermedia intra prediction value to derive a final prediction value of the current block. The method also includes performing the conversion based on the determining.
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