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    Method and apparatus of merge with motion vector difference for video coding
    2.
    发明授权
    Method and apparatus of merge with motion vector difference for video coding 有权

    公开(公告)号：US11539977B2

    公开(公告)日：2022-12-27

    申请号：US17263651

    申请日：2019-07-31

    申请人： MEDIATEK INC.

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

    IPC分类号： H04N19/52 ,  H04N19/105 ,  H04N19/176 ,  H04N19/46

    摘要： A method and apparatus of Inter prediction for video coding using UMVE (Ultimate Motion Vector Expression) are disclosed. According to this method, a base candidate is selected from an original Inter candidate list, where the base candidate has a base prediction direction. One or more extended candidates are derived by adding one or more offsets to the base candidate, where said one or more extended candidates have a same prediction direction as the base prediction direction. The extended candidates are then inserted into the original Inter candidate list to form an extended Inter candidate list for encoding or decoding. According to another method, the UMVE mode is treated as an additional AMVP (Advanced Motion Vector Prediction) mode.

    Signaling quantization matrix
    4.
    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 quantization related parameters
    7.
    发明授权
    Signaling quantization related parameters 有权

    公开(公告)号：US11297320B2

    公开(公告)日：2022-04-05

    申请号：US17143823

    申请日：2021-01-07

    申请人： MEDIATEK INC.

    发明人： Chen-Yen Lai ,  Chih-Wei Hsu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

    IPC分类号： H04N19/00 ,  H04N19/124 ,  H04N19/96 ,  H04N19/184

    摘要： A video decoder parses a sequence parameter set (SPS) that is applicable to a current sequence of video pictures that includes the current picture, the SPS comprises a first dependent quantization flag and a first sign hiding flag. When the first dependent quantization flag indicates that dependent quantization is enabled for the current sequence, the decoder parses a second dependent quantization flag for indicating whether dependent quantization is used for quantizing the one or more slices of the current picture. When the second dependent quantization flag indicates that dependent quantization is not used for one or more slices of the current picture and the first sign hiding flag indicates that sign hiding is enabled for the current sequence, the decoder parses a second sign hiding flag for indicating whether sign hiding is used for quantizing the one or more slices of the current picture.

    Method and apparatus of encoding or decoding video blocks by current picture referencing coding
    8.
    发明授权
    Method and apparatus of encoding or decoding video blocks by current picture referencing coding 有权

    公开(公告)号：US11252406B2

    公开(公告)日：2022-02-15

    申请号：US17291085

    申请日：2019-11-06

    申请人： MEDIATEK INC.

    发明人： Chen-Yen Lai ,  Yu-Ling Hsiao ,  Tzu-Der Chuang ,  Ching-Yeh Chen

    IPC分类号： H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

    摘要： Video processing methods comprise receiving input data of a current block in a current picture, constructing a candidate list for the current block by including one or more History-based Motion Vector Predictor (HMVP) candidates, selecting one candidate from the candidate list, locating a reference block according to motion information of the selected candidate, and encoding or decoding the current block by predicting the current block using the reference block. The one or more HMVP candidates are fetched from a normal HMVP table if the current block is to be processed by a normal inter prediction mode, and the one or more HMVP candidates are fetched form a Current Picture Referencing (CPR) HMVP table if the current block is to be processed by a CPR mode. The two HMVP tables are separately maintained and updated.

    Method and apparatus of current picture referencing for video coding using adaptive motion vector resolution and sub-block prediction mode
    9.
    发明授权
    Method and apparatus of current picture referencing for video coding using adaptive motion vector resolution and sub-block prediction mode 有权

    公开(公告)号：US11109056B2

    公开(公告)日：2021-08-31

    申请号：US16968295

    申请日：2019-02-11

    申请人： MEDIATEK INC.

    发明人： Chen-Yen Lai ,  Zhi-Yi Lin ,  Ching-Yeh Chen ,  Tzu-Der Chuang

    IPC分类号： H04N19/52 ,  H04N19/176 ,  H04N19/70 ,  H04N19/96

    摘要： Methods and apparatus for a video coding system with the current picture referencing (CPR) mode enabled are disclosed. According to one method, when the current reference picture is equal to the current picture, an integer motion vector flag is inferred to be true without signalling the integer or parsing the motion vector flag. In another method, when all motion vector differences for the current block are equal to zero, an integer motion vector flag is inferred to be true without signalling the integer or parsing the motion vector flag. In yet another method, when all reference pictures for the current block are equal to the current picture: the sub-block prediction coding mode is disabled; and the current block is encoded or decoded by disabling the sub-block prediction coding mode. Alternatively, derived motion vectors associated with sub-blocks for the current block can be converted into integer motion vectors.

    Signaling Of Quantization Matrices
    10.
    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.