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    BDOF-based inter prediction method and device
    91.
    发明授权
    BDOF-based inter prediction method and device 有权

    公开(公告)号：US12212758B2

    公开(公告)日：2025-01-28

    申请号：US18525179

    申请日：2023-11-30

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/159 ,  H04N19/186 ,  H04N19/46

    Abstract: An image decoding method includes: deriving an L0 motion vector and a L1 motion vector of the current block; deriving prediction samples of the current block based on the L0 motion vector and the L1 motion vector; and generating reconstructed samples of the current block based on the prediction samples. Deriving the prediction samples includes applying bi-directional optical flow (BDOF) to the current block based on whether the condition for applying BDOF to the current block is satisfied, and the application condition of the BDOF includes a condition whereby the values of L0 luma weighted prediction flag information and L1 luma weighted prediction flag information are both zero, where the a value of each of the L0 luma weighted prediction flag information and L1 luma weighted prediction flag information being 0 represents that a weight factor for each of a L0 and L1 prediction luma components does not exist, respectively.

    Method and device for coding image on basis of inter prediction
    93.
    发明授权
    Method and device for coding image on basis of inter prediction 有权

    公开(公告)号：US12137215B2

    公开(公告)日：2024-11-05

    申请号：US17555052

    申请日：2021-12-17

    Applicant: LG ELECTRONICS INC.

    Inventor： Hyeongmoon Jang ,  Naeri Park ,  Seunghwan Kim

    IPC: H04N19/109 ,  H04N19/122 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/503 ,  H04N19/70

    Abstract: A decoding method performed by a decoding device, according to the present document, may comprise the steps of: acquiring, from a bitstream, at least one of a combined inter-picture merge and intra-picture prediction (CIIP) enable flag and a coding unit (CU) skip flag indicating whether a skip mode is applied to a current block; acquiring, from the bitstream, a regular merge flag on the basis that a condition based on the current block size, and at least one of a condition based on the CIIP enable flag and a condition based on the CU skip flag are satisfied; generating prediction samples of the current block on the basis of the regular merge flag; and generating restoration samples on the basis of the prediction samples.

    DMVR-based inter-prediction method and device
    96.
    发明授权
    DMVR-based inter-prediction method and device 有权

    公开(公告)号：US12003735B2

    公开(公告)日：2024-06-04

    申请号：US18115113

    申请日：2023-02-28

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam

    IPC: H04N19/00 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

    CPC classification number: H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

    Abstract: An image decoding method comprises the steps of: determining whether or not an application condition of decoder-side motion vector refinement (DMVR) for applying motion vector refinement for a current block is satisfied; deriving a minimum sum of absolute differences (SAD) on the basis of L0 and L1 motion vectors of the current block if the application condition of the DMVR is satisfied; deriving refined L0 and L1 motion vectors of the current block based on the minimum SAD; deriving prediction samples of the current block based on the refined L0 and L1 motion vectors; and generating reconstructed samples of the current block based on the prediction samples. With respect to whether or not the application condition of the DMVR is satisfied, the application condition of the DMVR is determined to be satisfied if a prediction mode, in which inter-prediction and intra-prediction are combined, is not applied to the current block.

    INTER PREDICTION METHOD BASED ON HISTORY-BASED MOTION VECTOR, AND DEVICE THEREFOR
    97.
    发明公开
    INTER PREDICTION METHOD BASED ON HISTORY-BASED MOTION VECTOR, AND DEVICE THEREFOR 审中-公开

    公开(公告)号：US20240129517A1

    公开(公告)日：2024-04-18

    申请号：US18396416

    申请日：2023-12-26

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/513 ,  H04N19/44

    CPC classification number: H04N19/513 ,  H04N19/44

    Abstract: An image decoding method according to the present disclosure includes deriving a history-based motion vector prediction (HMVP) buffer for a current block, deriving motion information of the current block based on an HMVP candidate included in the HMVP buffer, generating prediction samples for the current block based on the motion information, and generating reconstructed samples based on the prediction samples, and the HMVP buffer is initialized when processing a first-ordered CTU in a CTU row in which a current CTU is located, and the current block is included in the current CTU.

    Inter-prediction method and device based on DMVR and BDOF
    99.
    发明授权
    Inter-prediction method and device based on DMVR and BDOF 有权

    公开(公告)号：US11936878B2

    公开(公告)日：2024-03-19

    申请号：US17959001

    申请日：2022-10-03

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  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 includes: deriving a refined L0 motion vector and a refined L1 motion vector by applying decoder-side motion vector refinement (DMVR) based on an L0 motion vector and an L1 motion vector of a current block, deriving prediction samples for the current block based on L0 prediction samples derived based on the refined L0 motion vector and L1 prediction samples derived based on the refined L1 motion vector, and generating reconstructed samples for the current block based on the prediction samples. The L0 prediction samples are derived based on an L0 reference picture and the refined L0 motion vector, and the L1 prediction samples are derived based on an L1 reference picture and the refined L1 motion vector, and deriving the prediction samples comprises determining whether to apply bi-directional optical flow (BDOF) process based on a first POC difference and a second POC difference are the same.

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