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    Image coding method and apparatus using motion vector differences
    102.
    发明授权
    Image coding method and apparatus using motion vector differences 有权

    公开(公告)号：US12219147B2

    公开(公告)日：2025-02-04

    申请号：US18234208

    申请日：2023-08-15

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

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

    Abstract: According to embodiments of the present document, a prediction procedure can be performed for image video coding, and the prediction procedure can comprise merge mode motion vector differences (MMVD) and symmetric motion vector differences (SMVD) according inter prediction. The inter prediction can be performed on the basis of reference pictures of a current picture, and types of the reference pictures (e.g. a long-term reference picture, a short-term reference picture, etc.) can be considered for the inter prediction. Accordingly, performance and coding efficiency in the prediction procedure can be increased.

    Method and device for processing general constraint information in image/video coding system
    103.
    发明授权
    Method and device for processing general constraint information in image/video coding system 有权

    公开(公告)号：US12200268B2

    公开(公告)日：2025-01-14

    申请号：US18410484

    申请日：2024-01-11

    Applicant: LG ELECTRONICS INC.

    Inventor： Hendry Hendry ,  Junghak Nam ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/70 ,  H04N19/172 ,  H04N19/184

    Abstract: A method by which a video decoding device decodes a video, according to the present document, comprises the steps of: parsing, from a bitstream, level information indicating the level with which output layer sets comply; acquiring, from the bitstream, constraint information about constraints with which the output layer sets comply; and performing a decoding procedure on the current picture on the basis of the level information and the constraint information, wherein the level information and the constraint information are included in a profile_tier_level syntax structure of the bitstream, and the constraint information in the profile_tier_level syntax structure can be next to the level information.

    INTER PREDICTION-BASED IMAGE CODING METHOD AND DEVICE
    104.
    发明申请
    INTER PREDICTION-BASED IMAGE CODING METHOD AND DEVICE 有权

    公开(公告)号：US20250016309A1

    公开(公告)日：2025-01-09

    申请号：US18893690

    申请日：2024-09-23

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: 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 apparatus
    105.
    发明授权
    DMVR-based inter prediction method and apparatus 有权

    公开(公告)号：US12192474B2

    公开(公告)日：2025-01-07

    申请号：US18376313

    申请日：2023-10-03

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/44 ,  H04N19/105 ,  H04N19/13 ,  H04N19/132 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

    Abstract: A video decoding method comprises: deriving L0 and L1 motion vectors of a current block; deriving decoder-side motion vector refinement (DMVR) flag information indicating whether to apply a DMVR to the current block; when the DMVR flag information indicates that the DMVR is to be applied to the current block, deriving refined L0 and L1 motion vectors based on the L0 and L1 motion vectors by applying the DMVR to the current block; 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 predicted samples, wherein deriving DMVR flag information comprises deriving the DMVR flag information by applying the DMVR to the current block when the height of the current block is 8 or more, and when the values of L0 and L1 luma weighted prediction flag information are both 0.

    Inter prediction method based on history-based motion vector, and device therefor
    106.
    发明授权
    Inter prediction method based on history-based motion vector, and device therefor 有权

    公开(公告)号：US12155857B2

    公开(公告)日：2024-11-26

    申请号：US18396416

    申请日：2023-12-26

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/44 ,  H04N19/513 ,  H04N19/53

    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.

    DMVR-based inter-prediction method and device
    109.
    发明授权
    DMVR-based inter-prediction method and device 有权

    公开(公告)号：US12081791B2

    公开(公告)日：2024-09-03

    申请号：US17894735

    申请日：2022-08-24

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

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

    CPC classification number: H04N19/52 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/577 ,  H04N19/70

    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.

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