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    Inter prediction-based image coding method and device
    111.
    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
    112.
    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 processing method and apparatus therefor
    116.
    发明授权
    Image processing method and apparatus therefor 有权

    公开(公告)号：US11381829B2

    公开(公告)日：2022-07-05

    申请号：US16325091

    申请日：2016-08-19

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Jaehyun Lim

    IPC: H04N19/44 ,  H04N19/137 ,  H04N19/119 ,  H04N19/105 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

    Abstract: An image decoding method may include: deriving motion information of a first prediction unit determined by a first partitioning mode of a current block and motion information of a second prediction unit determined by a second partitioning mode of the current block; generating a prediction block of the first prediction unit by using the motion information of the first prediction unit and generating a prediction block of the second prediction unit by using the motion information of the second prediction unit; and generating a prediction block of the current block in units of sub-prediction unit determined by combining the first prediction unit and the second prediction unit by using the first prediction block and the second prediction block.

    Method and apparatus for inter prediction in video coding system
    117.
    发明授权
    Method and apparatus for inter prediction in video coding system 有权

    公开(公告)号：US11303919B2

    公开(公告)日：2022-04-12

    申请号：US16863871

    申请日：2020-04-30

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Jaehyun Lim ,  Junghak Nam

    IPC: H04N19/44 ,  H04N21/235 ,  H04N19/537 ,  H04N19/513 ,  H04N19/103 ,  H04N19/119 ,  H04N19/176

    Abstract: A video decoding method performed by a decoding apparatus comprises deriving control points (CPs) for the current block; obtaining motion vectors for the CPs; deriving a motion vector of a sub-block or a sample unit in the current block on the basis of the obtained motion vectors; deriving a prediction sample for the current block on the basis of the derived motion vector; and generating a reconstruction sample on the basis of the prediction sample. The method enables effective performance of inter prediction through the motion vectors (transformation prediction), not only when an image in the current block is moved in a plane, but also when the image in the current block is rotated, zoomed in, zoomed out, or transformed into a parallelogram. Accordingly, the amount of data for the residual signal for the current block can be eliminated or reduced, and the overall coding efficiency can be improved.

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