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    Separate constrained directional enhancement filter
    1.
    发明授权
    Separate constrained directional enhancement filter 有权

    公开(公告)号：US12225192B2

    公开(公告)日：2025-02-11

    申请号：US17941738

    申请日：2022-09-09

    Applicant: TENCENT AMERICA LLC

    Inventor： Yixin Du ,  Liang Zhao ,  Xin Zhao ,  Shan Liu

    IPC: H04N19/117 ,  H04N19/139 ,  H04N19/176 ,  H04N19/186 ,  H04N19/44

    Abstract: A method, a non-transitory computer readable medium, and a computer system is provided for encoding or decoding video data. The method may include: receiving video data comprising a chroma component and a luma component; parsing, deriving or selecting a number of presets for the chroma component in one frame, and a number of presets for the luma component in the one frame; and decoding the video data. The method may further comprise: performing a separate Constrained Directional Enhancement Filter (CDEF) process of filtering luma and chroma components independent from each other based on the number of presets for the chroma component in one frame, and the number of presets for the luma component in the one frame.

    Sample offset with predefined filters
    4.
    发明授权
    Sample offset with predefined filters 有权

    公开(公告)号：US11818343B2

    公开(公告)日：2023-11-14

    申请号：US17568540

    申请日：2022-01-04

    Applicant: TENCENT AMERICA LLC

    Inventor： Xin Zhao ,  Yixin Du ,  Shan Liu

    IPC: H04N19/117 ,  H04N19/82 ,  H04N19/186 ,  H04N19/46 ,  H04N19/132

    CPC classification number: H04N19/117 ,  H04N19/132 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

    Abstract: A method for in-loop sample offset filtering in a video decoder is disclosed. The method includes extracting at least one loop filtering parameter from a coded video bitstream for a reconstructed sample of a first color component in a current picture reconstructed from the coded video bitstream, the at least one loop filtering parameter comprising a flag, and determining based on the flag a type of sample offset filter to be applied to the reconstructed sample of the first color component, the type of sample offset filter being either a predefined sample offset filter type or an encoder-derived sample offset filter type. The method further includes identifying a target sample offset filter to be applied to the reconstructed sample of the first color component based at least on the determined type of sample offset filter, and filtering the reconstructed sample of the first color component based on the target sample offset filter and a plurality of reconstructed reference samples of a second color component to generate a filtered reconstructed sample of the first color component.

    Method and apparatus for video coding
    6.
    发明授权
    Method and apparatus for video coding 有权

    公开(公告)号：US11671631B2

    公开(公告)日：2023-06-06

    申请号：US17495318

    申请日：2021-10-06

    Applicant: Tencent America LLC

    Inventor： Xin Zhao ,  Yixin Du ,  Shan Liu

    IPC: H04N19/82 ,  H04N19/172 ,  H04N19/593 ,  H04N19/86 ,  H04N19/186 ,  H04N19/132

    CPC classification number: H04N19/82 ,  H04N19/132 ,  H04N19/172 ,  H04N19/186 ,  H04N19/593 ,  H04N19/86

    Abstract: Aspects of the disclosure provide methods and apparatus for video decoding. Processing circuitry of the apparatus decodes coded information for a reconstructed sample of a current component in a current picture from a coded video bitstream. The coded information indicates a sample offset filter to be applied to the reconstructed sample. A filter shape of the sample offset filter is one of a plurality of filter shapes. Each of the plurality of filter shapes includes first reconstructed samples of a first component in the current picture. A filtered sample value of the reconstructed sample is determined based on the first reconstructed samples in the filter shape. The sample offset filter is an in-loop filter by which the output value is applied to the reconstructed sample as an offset to filter out coding artifacts while retaining details of the current component in the current picture.

    Flexible picture partitioning
    7.
    发明授权
    Flexible picture partitioning 有权

    公开(公告)号：US11412222B2

    公开(公告)日：2022-08-09

    申请号：US17098918

    申请日：2020-11-16

    Applicant: TENCENT AMERICA LLC

    Inventor： Liang Zhao ,  Xin Zhao ,  Yixin Du ,  Shan Liu

    IPC: H04N19/119 ,  H04N19/46 ,  H04N19/172 ,  H04N19/169 ,  H04N19/70

    Abstract: Systems and methods may provide flexible picture partitioning, a method includes receiving a coded picture that is partitioned into a plurality of coding tree units (CTUs), wherein at least one row or column of CTUs, among the plurality of CTUs of the coded picture, that is adjacent to a boundary of the coded picture has a size dimension that is smaller than a corresponding size dimension of each CTU among the plurality of CTUs that is not adjacent to any boundary of the coded picture; and decoding the coded picture based on the plurality of CTUs, wherein the at least one row or column of CTUs includes a first CTU row or a first CTU column of the coded picture that is adjacent to a top boundary or left boundary of the coded picture, respectively.

    FILTER LOCATION OF CROSS-COMPONENT SAMPLE OFFSET
    9.
    发明申请
    FILTER LOCATION OF CROSS-COMPONENT SAMPLE OFFSET 有权

    公开(公告)号：US20240397112A1

    公开(公告)日：2024-11-28

    申请号：US18793325

    申请日：2024-08-02

    Applicant: Tencent America LLC

    Inventor： Yixin Du ,  Xin Zhao ,  Shan Liu

    IPC: H04N19/82 ,  H04N19/186 ,  H04N19/86

    Abstract: In a method for video decoding, an offset value in a look up table of a cross-component sample offset (CCSO) filter is determined based on first reconstructed samples in a filter chain after a deblocking filter in the filter chain is applied and before a constrained directional enhancement filter (CDEF) in the filter chain is applied. The offset value of the CCSO filter is applied to second reconstructed samples in the filter chain after the CDEF in the filter chain is applied.

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