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    Method and apparatus for video filtering
    1.
    发明授权
    Method and apparatus for video filtering 有权

    公开(公告)号：US12177492B2

    公开(公告)日：2024-12-24

    申请号：US18332563

    申请日：2023-06-09

    Applicant: TENCENT AMERICA LLC

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

    IPC: H04N19/82 ,  H04N19/117 ,  H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593 ,  H04N19/70 ,  H04N19/86

    Abstract: A method for filtering in video encoding is provided. In the method, based on a determination that (i) an intra block copy (IBC) mode is disabled for a chroma component of a block and the IBC mode is enabled for a luma component of the block or (ii) decoupled partitioning structures are applied to the luma component of the block and the chroma component of the block, at least one loop filter is enabled for the chroma component of the block, a first sample of the luma component at a location in the block is determined based on a first loop filter configuration that does not include the at least one loop filter, and a second sample of the chroma component at the location in the block is determined based on a second loop filter configuration that includes the at least one loop filter.

    Using directionality information from a CDEF or intra coding process for restoration filtering
    2.
    发明授权
    Using directionality information from a CDEF or intra coding process for restoration filtering 有权

    公开(公告)号：US12143613B2

    公开(公告)日：2024-11-12

    申请号：US18070028

    申请日：2022-11-28

    Applicant: TENCENT AMERICA LLC

    Inventor： Sehoon Yea ,  Yixin Du ,  Xin Zhao ,  Shan Liu

    IPC: H04N19/117 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/44 ,  H04N19/82

    Abstract: A method of video decoding includes determining directionality information of a restoration filter unit included in a video frame based on directionality of each of one or more groups of pixels in the restoration filter unit determined by at least one of a previously performed CDEF process or a previously performed intra prediction coding process. The method also includes selecting, based on the directionality information of the restoration filter unit, a set of filter parameters from among a plurality of sets of filter parameters of a restoration filter process, and, after the at least one of the previously performed CDEF process or the previously performed intra prediction coding process, performing one of a Wiener filter process or a self-guided projection filter process as the restoration filter process on the restoration filter unit based on the selected set of filter parameters.

    Method and apparatus for offset in video filtering
    3.
    发明授权
    Method and apparatus for offset in video filtering 有权

    公开(公告)号：US12143579B2

    公开(公告)日：2024-11-12

    申请号：US17993538

    申请日：2022-11-23

    Applicant: TENCENT AMERICA LLC

    Inventor： Yixin Du ,  Xin Zhao ,  Shan Liu

    IPC: H04N19/117 ,  H04N19/124 ,  H04N19/132 ,  H04N19/186 ,  H04N19/70

    Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for filtering in video decoding includes processing circuitry. For example, the processing circuitry determines first reconstructed sample values of reconstructed samples of a first color component within a filter support region of a to-be filtered sample of a second color component. The to-be filtered sample is at a center position of the filter support region. Based on a mapping that associates offset values with reconstructed sample values within the filter support region, a first offset value of the offset values in the mapping that is associated with the first reconstructed sample values is determined. The first offset value is applied on the second color component for the to-be filtered sample to determine a filtered sample value of the second color component for the to-be filtered sample.

    Non-linear mapping based filter use in loop filter chain
    4.
    发明授权
    Non-linear mapping based filter use in loop filter chain 有权

    公开(公告)号：US12088853B2

    公开(公告)日：2024-09-10

    申请号：US18328480

    申请日：2023-06-02

    Applicant: Tencent America LLC

    Inventor： Yixin Du ,  Xin Zhao ,  Shan Liu

    IPC: H04N19/00 ,  H04N19/186 ,  H04N19/82 ,  H04N19/86

    CPC classification number: H04N19/82 ,  H04N19/186 ,  H04N19/86

    Abstract: A method for filtering includes determining, by a processor, a first offset value by applying a non linear mapping based filter to first reconstructed samples at a first node along a loop filter chain that includes a plurality of video filters. The method further includes applying, by the processor, the first offset value to an intermediate reconstructed sample at a second node along the loop filter chain to generate a second reconstructed sample, wherein the second node is one of an input node of the loop filter chain or an output node of the loop filter chain.

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

    公开(公告)号：US11706461B2

    公开(公告)日：2023-07-18

    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.

    Separate constrained directional enhancement filter
    8.
    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.

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