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    Signaling Of Quantization Matrices
    1.
    发明申请
    Signaling Of Quantization Matrices 有权

    公开(公告)号：US20210006795A1

    公开(公告)日：2021-01-07

    申请号：US16921717

    申请日：2020-07-06

    申请人： MediaTek Inc.

    发明人： Chen-Yen Lai ,  Olena Chubach ,  Tzu-Der Chuang ,  Ching-Yeh Chen ,  Chih-Wei Hsu ,  Yu-Wen Huang

    IPC分类号： H04N19/126 ,  H04N19/172 ,  H04N19/192

    摘要： A method for signaling scaling matrices for transform coefficient quantization is provided. A video decoder receives data from a bitstream to be decoded as a current picture of a video. The video decoder determines a plurality of scaling matrices that are used to code the current picture, wherein a first scaling matrix of the plurality of scaling matrices is determined by referencing a previously determined second scaling matrix of the plurality of scaling matrices. The video decoder dequantizes transform coefficients of transform blocks of the current picture by using the determined plurality of scaling matrices. The video decoder reconstructs the current picture by using the dequantized transform coefficients.

    Signaling quantization matrix
    3.
    发明授权
    Signaling quantization matrix 有权

    公开(公告)号：US11206395B2

    公开(公告)日：2021-12-21

    申请号：US17029239

    申请日：2020-09-23

    申请人： MediaTek Inc.

    发明人： Chen-Yen Lai ,  Olena Chubach ,  Tzu-Der Chuang ,  Ching-Yeh Chen

    IPC分类号： H04N19/105 ,  H04N19/30 ,  H04N19/46 ,  H04N19/176 ,  H04N19/159 ,  H04N19/186 ,  H04N19/70

    摘要： A method for signaling scaling matrices for transform coefficient quantization is provided. A decoder receives data from a bitstream to be decoded as a current picture of a video, the current picture to be decoded by using a plurality of scaling matrices. The decoder receives a reference index offset for a first scaling matrix of the plurality of scaling matrices. The decoder applies the reference index offset to a first index identifying the first scaling matrix to derive a second index identifying a second scaling matrix of the plurality of scaling matrices. The second scaling matrix is previously reconstructed. The decoder reconstructs the first scaling matrix by referencing the second scaling matrix. The decoder dequantizes transform coefficients of transform blocks of the current picture by using the plurality of scaling matrices and reconstructs the current picture by using the dequantized transform coefficients.

    Signaling coding of transform-skipped blocks
    7.
    发明授权
    Signaling coding of transform-skipped blocks 有权

    公开(公告)号：US11350131B2

    公开(公告)日：2022-05-31

    申请号：US16908436

    申请日：2020-06-22

    申请人： MediaTek Inc.

    发明人： Shih-Ta Hsiang ,  Lulin Chen ,  Tzu-Der Chuang ,  Chih-Wei Hsu ,  Ching-Yeh Chen ,  Olena Chubach ,  Yu-Wen Huang

    IPC分类号： H04N19/70 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176

    摘要： A method for performing transform skip mode (TSM) in a video decoder is provided. A video decoder receives data from a bitstream to be decoded as a plurality of video pictures. The video decoder parses the bitstream for a first syntax element in a sequence parameter set (SPS) of a current sequence of video pictures. When the first syntax element indicates that transform skip mode is allowed for the current sequence of video pictures and when transform skip mode is used for a current block in a current picture of the current sequence, the video decoder reconstructs the current block by using quantized residual signals that are not transformed.

    Constraints For Inter-Layer Referencing
    8.
    发明申请
    Constraints For Inter-Layer Referencing 有权

    公开(公告)号：US20210258587A1

    公开(公告)日：2021-08-19

    申请号：US17180190

    申请日：2021-02-19

    申请人： MediaTek Inc.

    发明人： Chen-Yen Lai ,  Ching-Yeh Chen ,  Tzu-Der Chuang ,  Olena Chubach

    IPC分类号： H04N19/169 ,  H04N19/503

    摘要： A video coding method using inter-layer prediction or referencing is provided. A video decoder receives data from a bitstream carrying data for video pictures in a plurality of different layers. At least one of the plurality of layers comprises temporal sublayers that correspond to levels in a hierarchical temporal prediction structure. Each temporal sublayer is associated with a temporal identifier. The video decoder receives an inter-layer prediction constraint parameter constraining a maximum temporal sublayer used in inter-layer prediction. The video decoder reconstructs a first picture in a first layer by referencing data of a second picture in a second layer. A temporal identifier of the referenced data satisfies the received inter-layer prediction constraint parameter.

    Signaling Quantization Matrix
    9.
    发明申请
    Signaling Quantization Matrix 有权

    公开(公告)号：US20210092361A1

    公开(公告)日：2021-03-25

    申请号：US17029239

    申请日：2020-09-23

    申请人： MediaTek Inc.

    发明人： Chen-Yen Lai ,  Olena Chubach ,  Tzu-Der Chuang ,  Ching-Yeh Chen

    IPC分类号： H04N19/105 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

    摘要： A method for signaling scaling matrices for transform coefficient quantization is provided. A decoder receives data from a bitstream to be decoded as a current picture of a video, the current picture to be decoded by using a plurality of scaling matrices. The decoder receives a reference index offset for a first scaling matrix of the plurality of scaling matrices. The decoder applies the reference index offset to a first index identifying the first scaling matrix to derive a second index identifying a second scaling matrix of the plurality of scaling matrices. The second scaling matrix is previously reconstructed. The decoder reconstructs the first scaling matrix by referencing the second scaling matrix. The decoder dequantizes transform coefficients of transform blocks of the current picture by using the plurality of scaling matrices and reconstructs the current picture by using the dequantized transform coefficients.

    Method and apparatus for video coding with constraints on reference picture lists of a RADL picture
    10.
    发明授权
    Method and apparatus for video coding with constraints on reference picture lists of a RADL picture 有权

    公开(公告)号：US11882270B2

    公开(公告)日：2024-01-23

    申请号：US17341879

    申请日：2021-06-08

    申请人： MEDIATEK INC.

    发明人： Shih-Ta Hsiang ,  Lulin Chen ,  Chih-Wei Hsu ,  Olena Chubach

    IPC分类号： H04N19/105 ,  H04N19/172 ,  H04N19/46 ,  H04N19/159

    CPC分类号： H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/46

    摘要： Method and apparatus for signaling or parsing constrained active entries in reference picture lists for multi-layer coding are disclosed. For the decoder side, when the current picture is a RADL (Random Access Decodable Leading) picture, reference picture list 0 or reference picture list 1 of the current picture is mandatorily required to contain no active entry corresponding to a RASL (Random Access Skipped Leading) picture with pps_mixed_nalu_types_in_pic_flag equal to 0 or a picture that precedes an associated IRAP (Intra Random Access Point) picture in decoding order, and wherein an active entry in the reference picture list 0 or the reference picture list 1 of the RADL picture can refer to a RASL picture with the pps_mixed_nalu_types_in_pic_flag equal to 1 and a referenced RASL picture either belongs to the same layer or a different layer than a layer containing the current picture which is the RADL picture.