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    DMVR-based inter-prediction method and device
    113.
    发明授权
    DMVR-based inter-prediction method and device 有权

    公开(公告)号：US11917160B2

    公开(公告)日：2024-02-27

    申请号：US17577671

    申请日：2022-01-18

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam

    IPC: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

    CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

    Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving a motion vector for a current block; determining whether to apply refinement to the motion vector for the current block; deriving a refined motion vector by applying decoder-side motion vector refinement (DMVR) to the motion vector if it is determined to apply refinement to the motion vector for the current block; deriving prediction samples for the current block on the basis of the refined motion vector; and generating reconstruction samples for the current block on the basis of the prediction samples, wherein the step of determining whether to apply refinement includes determining whether to apply the refinement on the basis of at least one of the size of the current block and bi-prediction weight index information for the current block.

    Inter-prediction method and apparatus in image coding system
    119.
    发明授权
    Inter-prediction method and apparatus in image coding system 有权

    公开(公告)号：US11800114B2

    公开(公告)日：2023-10-24

    申请号：US17843531

    申请日：2022-06-17

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Jaehyun Lim ,  Seunghwan Kim ,  Jungdong Seo ,  Jaeho Lee ,  Hyeongmoon Jang

    IPC: H04N19/139 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/503

    CPC classification number: H04N19/139 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/503

    Abstract: An image decoding method performed by a decoding apparatus includes the operations of: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block based on a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated based on the scaled movement vector and location of the current block; and deriving a movement vector of the current block based on the updated movement vector.

    Image coding method and device using deblocking filtering
    120.
    发明授权
    Image coding method and device using deblocking filtering 有权

    公开(公告)号：US11736736B2

    公开(公告)日：2023-08-22

    申请号：US17688533

    申请日：2022-03-07

    Applicant: LG ELECTRONICS INC.

    Inventor： Hyeongmoon Jang ,  Junghak Nam

    IPC: H04N19/176 ,  H04N19/82 ,  H04N19/117 ,  H04N19/85

    CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/176 ,  H04N19/85

    Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: generating a restoration picture on the basis of prediction samples of a coding block; deriving a boundary strength (BS) for a boundary of the coding block in the restoration picture; performing deblocking filtering on the boundary of the coding block on the basis of the boundary strength; and deriving a modified restoration picture for the restoration picture on the basis of the deblocking filtering, wherein the boundary strength is derived on the basis of a prediction mode of a first block and a second block that are adjacent to the boundary of the coding block, and the prediction mode of the first block or the second block is derived on the basis of whether the prediction mode of the first block or the second block is a current picture referencing (CPR) mode to be coded in reference to a current picture.

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