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    Adaptive Cross-Component Sample Offset Filtering Parameters
    2.
    发明公开
    Adaptive Cross-Component Sample Offset Filtering Parameters 审中-公开

    公开(公告)号：US20240283926A1

    公开(公告)日：2024-08-22

    申请号：US18466603

    申请日：2023-09-13

    申请人： TENCENT AMERICA LLC

    发明人： Xin ZHAO ,  Samruddhi Yashwant KAHU ,  Shan LIU

    IPC分类号： H04N19/117 ,  H04N19/124 ,  H04N19/70

    CPC分类号： H04N19/117 ,  H04N19/124 ,  H04N19/70

    摘要： This disclosure describes a set of advanced video coding technologies and is particular related to cross-component sample offset (CCSO) filtering of reconstructed samples. For example, CCSO filter parameters may be allowed to vary from a filtering unit to another filtering unit. A filtering unit may be a filtering block or a filtering region containing multiple spatially adjacent filtering blocks in a reconstructed frame. Corresponding allowed options of CCSO filter parameter combinations may be specified. Each filtering unit may select from the allowed combination options. The selected combination options may be signaled in the bitstream or derived in some other manners. Allowing such CCSO filter parameter variation within a frame may provide filtering quality gain that outweighs a cost of overhead in signaling.

    ADAPTIVE BANDS FOR FILTER OFFSET SELECTION IN CROSS-COMPONENT SAMPLE OFFSET
    3.
    发明公开
    ADAPTIVE BANDS FOR FILTER OFFSET SELECTION IN CROSS-COMPONENT SAMPLE OFFSET 审中-公开

    公开(公告)号：US20240244212A1

    公开(公告)日：2024-07-18

    申请号：US18367976

    申请日：2023-09-13

    申请人： Tencent America LLC

    发明人： Samruddhi Yashwant KAHU ,  Xin ZHAO ,  Shan LIU

    IPC分类号： H04N19/132 ,  H04N19/117 ,  H04N19/169 ,  H04N19/172 ,  H04N19/176 ,  H04N19/186 ,  H04N19/80

    CPC分类号： H04N19/132 ,  H04N19/117 ,  H04N19/172 ,  H04N19/176 ,  H04N19/186 ,  H04N19/1887 ,  H04N19/80

    摘要： Processing circuitry receives coded information indicative of applying cross-component sample offset (CCSO) with adaptive bands. The processing circuitry determines at least a first band width for a first band and a second band width for a second band. The processing circuitry determines at least a first offset associated with the first band and a second offset associated with the second band, and categorizes reconstructed samples of a first color component into at least the first band and the second band. The first band includes first reconstructed samples and the second band includes second reconstructed samples. The processing circuitry applies the first offset to first reconstructed samples of a second color component that are collocated with the first reconstructed samples of the first color component, and the second offset to second reconstructed samples of the second color component that are collocated with the second reconstructed samples of the first color component.

    CROSS-COMPONENT SAMPLE OFFSET OPTIMIZATION BY EARLY TERMINATION OF OPTIMAL FILTER PARAMETER SEARCH
    6.
    发明公开
    CROSS-COMPONENT SAMPLE OFFSET OPTIMIZATION BY EARLY TERMINATION OF OPTIMAL FILTER PARAMETER SEARCH 审中-公开

    公开(公告)号：US20240291975A1

    公开(公告)日：2024-08-29

    申请号：US18367979

    申请日：2023-09-13

    申请人： Tencent America LLC

    发明人： Samruddhi Yashwant KAHU ,  Xin ZHAO ,  Shan LIU

    IPC分类号： H04N19/117 ,  H04N19/176

    CPC分类号： H04N19/117 ,  H04N19/176

    摘要： Processing circuitry determines to use cross-component sample offset (CCSO) for coding one or more blocks in a current picture, and starts a search for combinations of values for filter parameters of the CCSO, each combination of values for the filter parameters includes values respectively for each filter parameter. The processing circuitry determines that a first rate distortion cost associated with at least a first combination of values satisfies a condition, terminates the search for at least a second combination of values for the filter parameters of the CCSO in response to the first rate distortion cost satisfying the condition, and select values of the filter parameters for performing the CCSO for coding the one or more blocks in the current picture based on the combinations of values resulting from the search, the combinations of values resulting from the search exclude the second combination of values.

    SYSTEMS AND METHODS FOR FREQUENCY-DEPENDENT COEFFICIENT SIGN CODING
    8.
    发明公开
    SYSTEMS AND METHODS FOR FREQUENCY-DEPENDENT COEFFICIENT SIGN CODING 审中-公开

    公开(公告)号：US20230319260A1

    公开(公告)日：2023-10-05

    申请号：US18121422

    申请日：2023-03-14

    申请人： Tencent America LLC

    发明人： Samruddhi Yashwant KAHU ,  Xin ZHAO ,  Madhu PERINGASSERY KRISHNAN ,  Shan LIU

    IPC分类号： H04N19/105 ,  H04N19/18 ,  H04N19/176

    CPC分类号： H04N19/105 ,  H04N19/18 ,  H04N19/176

    摘要： The various embodiments described herein include methods and systems for coding video. In one aspect, a method includes obtaining video data comprising a plurality of blocks, including a first block. The method further includes determining a plurality of transform coefficients associated with the first block; and selecting a subset of the plurality of transform coefficients based on a frequency corresponding to each transform coefficient of the plurality of transform coefficients. The method also includes predicting respective coefficient signs for selected subset of the transform coefficients associated with the first block based on respective context information; and reconstructing the first block based on the plurality of transform coefficients and the predicted respective coefficient signs.

    COEFFICIENT SIGN PREDICTION FOR TRANSFORM SKIP
    9.
    发明公开
    COEFFICIENT SIGN PREDICTION FOR TRANSFORM SKIP 审中-公开

    公开(公告)号：US20230283779A1

    公开(公告)日：2023-09-07

    申请号：US17984229

    申请日：2022-11-09

    申请人： Tencent America LLC

    发明人： Samruddhi Yashwant KAHU ,  Xin ZHAO ,  Madhu PERINGASSERY KRISHNAN ,  Shan LIU

    IPC分类号： H04N19/136 ,  H04N19/132 ,  H04N19/105 ,  H04N19/176

    CPC分类号： H04N19/136 ,  H04N19/132 ,  H04N19/105 ,  H04N19/176

    摘要： Aspects of the present disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus includes processing circuitry that is configured to receive a coded video stream including a current block that is associated with a transform block, and determine whether a transform skip is used in the transform block. In response to a determination that the transform skip is not used in the transform block, the processing circuitry is configured to perform a first transform coefficient sign prediction in which (i) first signs of a first plurality of transform coefficients are predicted based on a first plurality of neighboring samples, and (ii) second signs of a second plurality of transform coefficients are predicted based on a second plurality of neighboring samples. The processing circuitry is further configured to reconstruct the current block based on the first plurality of transform coefficients and the second plurality of transform coefficients.