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    Method and device for image coding using motion vector differences
    201.
    发明授权
    Method and device for image coding using motion vector differences 有权

    公开(公告)号：US11523119B2

    公开(公告)日：2022-12-06

    申请号：US17550995

    申请日：2021-12-14

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/52 ,  H04N19/105 ,  H04N19/109 ,  H04N19/139 ,  H04N19/176

    Abstract: According to embodiments of the present document, a prediction procedure may be performed for image/video coding, and the prediction procedure may include symmetric motion vector differences (SMVDs) and merge mode motion vector differences (MMVDs) according to an inter prediction. The inter prediction may be performed on the basis of reference pictures of a current picture, and types (e.g., a long term reference picture, a short term reference picture, etc.) of the reference pictures may be considered for the inter prediction. Therefore, performance and coding efficiency in the prediction procedure can be improved.

    Inter prediction-based image coding method and device
    202.
    发明授权
    Inter prediction-based image coding method and device 有权

    公开(公告)号：US11457208B2

    公开(公告)日：2022-09-27

    申请号：US17550812

    申请日：2021-12-14

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/00 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

    Abstract: An image decoding method according to the present document may comprise: a step for deriving an inter prediction mode from encoded information; a step for constructing reference pictures lists; a step for deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) on the basis of reference pictures included in the reference picture lists; and a step for generating prediction samples on the basis of the motion information. The reference picture indices for SMVD may be derived on the basis of short-term reference pictures included in the reference picture lists.

    DMVR-based inter-prediction method and device
    203.
    发明授权
    DMVR-based inter-prediction method and device 有权

    公开(公告)号：US11451820B2

    公开(公告)日：2022-09-20

    申请号：US17470899

    申请日：2021-09-09

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/52 ,  H04N19/70 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/577

    Abstract: An image decoding method includes: acquiring, from a bitstream, luma weight L0 flag information indicating whether there is an L0 prediction-related weight factor and luma weight L1 flag information indicating whether there is an L1 prediction-related weight factor; determining to apply decoder-side motion vector refinement (DMVR) to an L0 motion vector and L1 motion vector for a current block, when the luma weight L0 flag information and the luma weight L1 flag information are both zero; when it has been determined to apply DMVR, deriving a refined L0 motion vector and a refined L1 motion vector by applying the DMVR to the current block; deriving prediction samples for the current block on the basis of L0 prediction using the refined L0 motion vector and L1 prediction using the refined L1 motion vector; and generating reconstruction samples for the current block on the basis of the prediction samples.

    IMAGE CODING METHOD BASED ON TRANSFORM AND APPARATUS THEREFOR
    208.
    发明申请
    IMAGE CODING METHOD BASED ON TRANSFORM AND APPARATUS THEREFOR 有权

    公开(公告)号：US20220264105A1

    公开(公告)日：2022-08-18

    申请号：US17732126

    申请日：2022-04-28

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Hyeongmoon Jang ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/132 ,  H04N19/159 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176

    Abstract: An image decoding method according to the present document may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross-component linear model (CCLM) mode on the basis of intra prediction mode information; updating the intra prediction mode of the chroma block on the basis of an intra prediction mode of a luma block corresponding to the chroma block; when the chroma block is not square, remapping the updated intra prediction mode to a wide-angle intra prediction mode; and determining an LFNST set including LFNST matrices on the basis of the remapped intra prediction mode.

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