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    USING PALETTE PREDICTOR IN VIDEO CODING
    24.
    发明申请
    USING PALETTE PREDICTOR IN VIDEO CODING 有权

    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.

    PALETTE MODE WITH DIFFERENT PARTITION STRUCTURES
    25.
    发明申请
    PALETTE MODE WITH DIFFERENT PARTITION STRUCTURES 有权

    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.

    CHROMA INTRA MODE DERIVATION IN SCREEN CONTENT CODING
    26.
    发明申请
    CHROMA INTRA MODE DERIVATION IN SCREEN CONTENT CODING 有权

    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.

    SIGNALING IN TRANSFORM SKIP MODE
    27.
    发明申请
    SIGNALING IN TRANSFORM SKIP MODE 有权

    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.

    SUB-BLOCK TRANSFORM IN TRANSFORM SKIP MODE
    28.
    发明申请
    SUB-BLOCK TRANSFORM IN TRANSFORM SKIP MODE 有权

    公开(公告)号：US20220030240A1

    公开(公告)日：2022-01-27

    申请号：US17473366

    申请日：2021-09-13

    Applicant: Beijing Bytedance Network Technology Co., Ltd. ,  Bytedance Inc.

    Inventor： Hongbin LIU ,  Li ZHANG ,  Kai ZHANG ,  Jizheng XU ,  Weijia ZHU ,  Yue WANG

    IPC: H04N19/122 ,  H04N19/119 ,  H04N19/176 ,  H04N19/13 ,  H04N19/157 ,  H04N19/105 ,  H04N19/70

    Abstract: A method for video processing includes determining, based on a first indication, whether a sub-block residual coding scheme is applied to residual of a current video block in a transform skip mode, the sub-block residual coding scheme splitting the residual of the current video block into multiple sub-blocks and a subset of the multiple sub-blocks have non-zero coefficients; determining, based on a second indication, a specific split pattern to be applied to the residual of the current video block, in response to the sub-block residual coding scheme being applied to the residual of the current video block; deriving, based on a third indication, the subset of the multiple sub-blocks which have non-zero coefficients; and performing a conversion on the residue of the current video block based on the determined subset of sub-blocks having non-zero coefficients.

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