公开(公告)号：US20220210447A1

公开(公告)日：2022-06-30

申请号：US17692782

申请日：2022-03-11

Applicant: Bytedance Inc.

Inventor： Li ZHANG ,  Weijia ZHU ,  Jizheng XU

IPC: H04N19/186 ,  H04N19/159 ,  H04N19/176 ,  H04N19/169

Abstract: In one example aspect, a method of video processing includes performing a conversion between a current block of a video and a bitstream of the video using a palette mode in which a palette of representative sample values is used for coding the current block. During the conversion, one or multiple predictor palettes are used for predicting the palette of representative sample values, and wherein updating of the one or multiple predictor palettes after the conversion of the current block is disabled according to a rule based on a characteristic of the current block.

公开(公告)号：US20220182655A1

公开(公告)日：2022-06-09

申请号：US17671486

申请日：2022-02-14

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Jizheng XU ,  Li ZHANG ,  Hsiao Chiang CHUANG

IPC: H04N19/50 ,  H04N19/186 ,  H04N19/176 ,  H04N19/136 ,  H04N19/132 ,  H04N19/169 ,  H04N19/159 ,  H04N19/119 ,  H04N19/124 ,  H04N19/70

Abstract: Methods, systems, and devices for using palette mode with different partition structures are described. An example method for video processing includes maintaining, for a conversion between a video comprising one or more video regions comprising a current video block and a bitstream representation of the video, a palette prediction table for a prediction of a palette used in a palette mode coding tool used for the current video block, making a determination that a local dual tree coding is applied to the conversion, modifying, based on the determination, the palette prediction table, and performing, based on the palette prediction table subsequent to the modifying, the conversion, wherein the palette mode coding tool represents the current video block using a palette of representative color values, and wherein the local dual tree coding enables partitioning of chroma blocks independently from corresponding luma blocks based on a block size.

公开(公告)号：US20220078410A1

公开(公告)日：2022-03-10

申请号：US17528288

申请日：2021-11-17

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

Abstract: A method of video processing is described. The method includes deriving, for a current video block of a video that is a chroma block and coded in a chroma DM mode, an intra prediction mode for the current video block according to a rule related to a coding mode of the current video block; and performing a conversion between the current video block and a coded presentation of the video, wherein the rule specifies to derive the intra prediction mode based on an intra prediction direction of a corresponding luma block used to derive the chroma DM mode and coded using a block differential pulse code modulation representation of a quantized residual block corresponding to the current video block.

公开(公告)号：US20220030280A1

公开(公告)日：2022-01-27

申请号：US17494934

申请日：2021-10-06

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU

IPC: H04N19/70 ,  H04N19/132 ,  H04N19/96 ,  H04N19/159 ,  H04N19/176

Abstract: Devices, systems and methods for coefficient coding in transform skip mode are described. An exemplary method for visual media processing includes: for encoding a current video block in a video region of a visual media data into a bitstream representation of the visual media data, identifying usage of a coding mode and/or an intra prediction mode and/or a set of allowable intra prediction modes; and upon identifying the usage, making a decision of whether to include or exclude, in the bitstream representation, a syntax element indicative of selectively applying a transform skip mode to the current video block, wherein, in the transform skip mode, a residual of a prediction error between the current video block and a reference video block is represented in the bitstream representation of the visual media data without applying a transformation.

公开(公告)号：US20210385459A1

公开(公告)日：2021-12-09

申请号：US17411296

申请日：2021-08-25

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU ,  Hsiao Chiang CHUANG

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

Abstract: Video coding and decoding methods are described. An example method includes determining, based on an applicability rule, that a differential coding mode is applicable to a conversion between a chroma video block of a video and a bitstream representation of the chroma video block, and performing, based on the determining, the conversion between the chroma video block and the bitstream representation of the chroma video block using the differential coding mode, where the chroma video block is represented in the bitstream representation using a difference between a quantized residual of an intra prediction of the chroma video block and a prediction of the quantized residual in the differential coding mode, where the intra prediction is performed in a first direction and the prediction of the quantized residual is performed in a second direction, and where the difference is represented using a differential pulse coding modulation (DPCM) representation.

公开(公告)号：US20220210433A1

公开(公告)日：2022-06-30

申请号：US17694008

申请日：2022-03-14

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU

IPC: H04N19/14 ,  H04N19/117 ,  H04N19/176 ,  H04N19/196 ,  H04N19/86

Abstract: An example method of video processing includes performing a conversion between a block of a chroma component of a video and a bitstream representation of the video. During the conversion, a deblocking filter process is applied to at least some samples along an edge of the block, and wherein chroma quantization parameter (QP) offsets are added to outputs from a chroma QP table to determine parameters for the deblocking filter process.

公开(公告)号：US20220201300A1

公开(公告)日：2022-06-23

申请号：US17692929

申请日：2022-03-11

Applicant: Bytedance Inc.

Inventor： Li ZHANG ,  Weijia ZHU ,  Jizheng XU

IPC: H04N19/119 ,  H04N19/169 ,  H04N19/176 ,  H04N19/186

Abstract: In one example aspect, a method of video processing includes performing a conversion between a current block in video unit of a video and a bitstream of the video using a palette mode in which a palette of representative sample values is used for coding the current block. During the conversion, a predictor palette is used for predicting the palette of representative sample values, and wherein a size of the predictor palette is adaptively adjusted according to a rule.

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.

公开(公告)号：US20250088625A1

公开(公告)日：2025-03-13

申请号：US18957496

申请日：2024-11-22

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Yuwen HE ,  Li ZHANG

IPC: H04N19/105 ,  H04N19/139 ,  H04N19/159 ,  H04N19/167 ,  H04N19/176 ,  H04N19/96

Abstract: Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: determining, for a conversion between a current block of a video and a bitstream of the video, that a first prediction mode is applied to the current block, deriving, in the first prediction mode, prediction samples of the current block based on reference values in a virtual buffer that are determined by a block vector for the current block; performing the conversion based on the prediction samples; determining a set of blocks from a plurality of blocks of the same video region based on coded information of the plurality of blocks, the plurality of blocks being coded before the current block; and updating the virtual buffer based on the set of blocks.

公开(公告)号：US20220264122A1

公开(公告)日：2022-08-18

申请号：US17720634

申请日：2022-04-14

Applicant: Bytedance Inc.

Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU ,  Kai ZHANG

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/124 ,  H04N19/12 ,  H04N19/117 ,  H04N19/30 ,  H04N19/157 ,  H04N19/60 ,  H04N19/132 ,  H04N19/167

Abstract: An example method of video processing includes performing a conversion between a video comprising one or more coding units and a bitstream representation of the video. The bitstream representation conforms to a format rule that specifies that chroma quantization parameters are included in the bitstream representation at a coding unit level or a transform unit level according to the format rule.