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    Method and Apparatus of Latency Reduction for Chroma Residue Scaling
    1.
    发明申请
    Method and Apparatus of Latency Reduction for Chroma Residue Scaling 有权

    公开(公告)号：US20220182633A1

    公开(公告)日：2022-06-09

    申请号：US17436836

    申请日：2020-03-13

    Applicant: MEDIATEK INC.

    Inventor： Zhi-Yi LIN ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chih-Wei HSU

    IPC: H04N19/132 ,  H04N19/30 ,  H04N19/186 ,  H04N19/176

    Abstract: A method and apparatus of video decoding are disclosed. According to one method, the chroma residue scaling factors are derived based on neighboring prediction or reconstructed luma samples of the collocated luma block, where the neighboring prediction or reconstructed luma samples of the collocated luma block correspond to samples among M samples along a top boundary of the collocated luma block and N samples along a left boundary of the collocated luma block. Chroma scaling is applied to chroma residual samples of the chroma residual block according to the chroma residue scaling factors derived. In another method, the chroma residue scaling factors are derived based on one or more reconstructed luma samples outside the collocated luma processing data unit. In another method, the chroma residue scaling factors are signaled in or parsed from APS (Adaptation Parameter Set) of the bitstream.

    Method and Apparatus of Video Coding Using Bi-Directional CU Weight
    2.
    发明申请
    Method and Apparatus of Video Coding Using Bi-Directional CU Weight 有权

    公开(公告)号：US20210211644A1

    公开(公告)日：2021-07-08

    申请号：US17056111

    申请日：2019-05-23

    Applicant: MEDIATEK INC.

    Inventor： Yu-Chi SU ,  Ching-Yeh CHEN ,  Zhi-Yi LIN ,  Tzu-Der CHUANG

    IPC: H04N19/105 ,  H04N19/159 ,  H04N19/51 ,  H04N19/176

    Abstract: A method and apparatus of encoding or decoding for a coding system, where bi-directional CU (coding unit) weighting (BCW) is enabled for the coding system to allow using multiple pairs of weights, are disclosed. According to this method, a Merge candidate list is generated for the current block, where current bi-directional CU weights for a bi-directional predictor of the current block associated with a target Merge candidate in the Merge candidate list are set to a pre-define pair of weights when the target Merge candidate corresponds to a selected Merge candidate. In another method, current bi-directional CU weights for a bi-directional predictor associated with a target Merge candidate in the Merge candidate list are inherited from the target Merge candidate when the target Merge candidate corresponds to a selected Merge candidate.

    Method and Apparatus of Luma-Chroma Separated Coding Tree Coding with Constraints
    4.
    发明申请
    Method and Apparatus of Luma-Chroma Separated Coding Tree Coding with Constraints 有权

    公开(公告)号：US20220086439A1

    公开(公告)日：2022-03-17

    申请号：US17418311

    申请日：2019-12-30

    Applicant: MEDIATEK INC.

    Inventor： Chia-Ming TSAI ,  Tzu-Der CHUANG ,  Chih-Wei HSU ,  Ching-Yeh CHEN ,  Zhi-Yi LIN

    IPC: H04N19/119 ,  H04N19/96 ,  H04N19/186 ,  H04N19/176

    Abstract: A method and apparatus for block partition are disclosed. If a cross-colour component prediction mode is allowed, the luma block and the chroma block are partitioned into one or more luma leaf blocks and chroma leaf blocks. If a cross-colour component prediction mode is allowed, whether to enable an LM (Linear Model) mode for a target chroma leaf block is determined based on a first split type applied to an ancestor chroma node of the target chroma leaf block and a second split type applied to a corresponding ancestor luma node. According to another method, after the luma block and the chroma block are partitioned using different partition tress, determine whether one or more exception conditions to allow an LM for a target chroma leaf block are satisfied when the chroma partition tree uses a different split type, a different partition direction, or both from the luma partition tree.

    Method and Apparatus of Motion Vector Buffer Management for Video Coding System
    5.
    发明申请
    Method and Apparatus of Motion Vector Buffer Management for Video Coding System 有权

    公开(公告)号：US20210297691A1

    公开(公告)日：2021-09-23

    申请号：US17253306

    申请日：2019-06-20

    Applicant: MEDIATEK INC.

    Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Zhi-Yi LIN

    IPC: H04N19/52 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/543 ,  H04N19/423 ,  H04N19/96

    Abstract: Methods and apparatus of Inter prediction using coding modes including an affine mode are disclosed. According to one method, if the target neighbouring block is in a neighbouring region of the current block, an affine control-point MV candidate is derived based on two target MVs (motion vectors) of the target neighbouring block where the affine control-point MV candidate is based on a 4-parameter affine model and the target neighbouring block is coded in a 6-parameter affine mode. According to another method, if the target neighbouring block is in a neighbouring region of the current block, an affine control-point MV candidate is derived based on two sub-block MVs (motion vectors) of the target neighbouring block, if the target neighbouring block is in a same region as the current block, the affine control-point MV candidate is derived based on control-point MVs of the target neighbouring block.

    Method and Apparatus of Current Picture Referencing for Video Coding Using Adaptive Motion Vector Resolution and Sub-Block Prediction Mode
    6.
    发明申请
    Method and Apparatus of Current Picture Referencing for Video Coding Using Adaptive Motion Vector Resolution and Sub-Block Prediction Mode 审中-公开

    公开(公告)号：US20200374545A1

    公开(公告)日：2020-11-26

    申请号：US16968295

    申请日：2019-02-11

    Applicant: MEDIATEK INC.

    Inventor： Chen-Yen LAI ,  Zhi-Yi LIN ,  Ching-Yeh CHEN ,  Tzu-Der CHUANG

    IPC: H04N19/52 ,  H04N19/70 ,  H04N19/176

    Abstract: 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.

    Method and Apparatus of Constrained Overlapped Block Motion Compensation in Video Coding
    7.
    发明申请
    Method and Apparatus of Constrained Overlapped Block Motion Compensation in Video Coding 审中-公开

    公开(公告)号：US20200021845A1

    公开(公告)日：2020-01-16

    申请号：US16507403

    申请日：2019-07-10

    Applicant: MEDIATEK INC.

    Inventor： Zhi-Yi LIN ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chun-Chia CHEN ,  Chih-Wei HSU

    IPC: H04N19/577 ,  H04N19/70

    Abstract: Method and apparatus of using an Inter coding tool and OBMC (Overlapped Block Motion Compensation) are disclosed. According to one method, when the neighboring block is bi-prediction coded, the neighboring block is treated as a uni-prediction block by deriving an associated OBMC predictor based on uni-prediction motion information derived from the neighboring block. According to another method, when OBMC is applied depending on one or more constraints, an OBMC syntax is signaled conditionally at the encoder side or the OBMC syntax is parsed conditionally at the decoder side for the current block, where the OBMC syntax indicates whether the OBMC is applied to the current block.

    Method and Apparatus of Latency Reduction for Chroma Residue Scaling
    10.
    发明申请
    Method and Apparatus of Latency Reduction for Chroma Residue Scaling 有权

    公开(公告)号：US20220150496A1

    公开(公告)日：2022-05-12

    申请号：US17614703

    申请日：2020-05-29

    Applicant: MEDIATEK INC.

    Inventor： Zhi-Yi LIN ,  Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Chih-Wei HSU

    IPC: H04N19/119 ,  H04N19/132 ,  H04N19/146 ,  H04N19/184

    Abstract: A method and apparatus of video coding are disclosed. A piece-wise linear mapping is derived to map a target luma sample from a first signal domain to a second signal domain, or vice versa. The piece-wise linear mapping process comprises determining first pivot points for performing video encoding or decoding of the luma samples using a piece-wise linear mapping. The first pivot points are determined so that: if a target mapped pivot point corresponding to one first pivot point in the second signal domain has a multiple of the target interval value, the target mapped pivot point and a next mapped pivot point can be located in a same second segment; and otherwise, the target mapped pivot point and the next mapped pivot point cannot be located in the same second segment.

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