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    Method for decoding image on basis of CCLM prediction in image coding system, and device therefor
    12.
    发明授权
    Method for decoding image on basis of CCLM prediction in image coding system, and device therefor 有权

    公开(公告)号：US12219157B2

    公开(公告)日：2025-02-04

    申请号：US18596372

    申请日：2024-03-05

    Applicant: LG ELECTRONICS INC.

    Inventor： Jangwon Choi ,  Jin Heo ,  Seunghwan Kim ,  Sunmi Yoo ,  Ling Li ,  Jungah Choi

    IPC: H04N19/186 ,  H04N19/105 ,  H04N19/136 ,  H04N19/176

    Abstract: A video decoding method performed by a decoding apparatus according to the present disclosure includes deriving one of a plurality of cross-component linear model (CCLM) prediction mode as a CCLM prediction mode of the current chroma block, deriving a sample number of neighboring chroma samples of the current chroma block based on the CCLM prediction mode of the current chroma block, a size of the current chroma block, and a specific value; deriving the neighboring chroma samples of the sample number, calculating CCLM parameters based on the neighboring chroma samples and the down sampled neighboring luma samples, deriving prediction samples for the current chroma block based on the CCLM parameters and the down sampled luma samples and generating reconstructed samples for the current chroma block based on the prediction samples, wherein the specific value is derived as 2.

    RESIDUAL CODING METHOD AND DEVICE FOR SAME
    13.
    发明申请
    RESIDUAL CODING METHOD AND DEVICE FOR SAME 有权

    公开(公告)号：US20250039382A1

    公开(公告)日：2025-01-30

    申请号：US18917598

    申请日：2024-10-16

    Applicant: LG ELECTRONICS INC.

    Inventor： Jungah CHOI ,  Sunmi Yoo ,  Jin Heo ,  Seunghwan Kim ,  Jangwon Choi

    IPC: H04N19/122 ,  H04N19/136 ,  H04N19/176 ,  H04N19/196

    Abstract: A method for decoding a picture performed by a decoding apparatus according to the present disclosure includes receiving a bitstream including residual information, deriving a quantized transform coefficient for a current block based on the residual information included in the bitstream, deriving a transform coefficient from the quantized transform coefficient based on a dequantization process, deriving a residual sample for the current block by applying an inverse transform to the derived transform coefficient, and generating a reconstructed picture based on the residual sample for the current block.

    Filtering-based image coding device and method
    15.
    发明授权
    Filtering-based image coding device and method 有权

    公开(公告)号：US12192446B2

    公开(公告)日：2025-01-07

    申请号：US18215565

    申请日：2023-06-28

    Applicant: LG ELECTRONICS INC.

    Inventor： Hendry Hendry ,  Seethal Paluri ,  Seunghwan Kim

    IPC: H04N7/12 ,  H04N19/105 ,  H04N19/132 ,  H04N19/172 ,  H04N19/176 ,  H04N19/46

    Abstract: According to embodiments described herein, sub-pictures and/or virtual boundaries can be used for coding an image. For example, sub-pictures in the current picture can be used for predicting, reconstructing, and/or filtering the current picture. Virtual boundaries can be used for filtering reconstructed samples of the current picture. Through image coding based on the subpictures and/or virtual boundaries according to embodiments described herein, the subjective/objective quality of an image can be improved, and the consumption of hardware resources necessary for the coding can be reduced.

    Adaptive loop filter-based video or image coding
    16.
    发明授权
    Adaptive loop filter-based video or image coding 有权

    公开(公告)号：US12177428B2

    公开(公告)日：2024-12-24

    申请号：US18375196

    申请日：2023-09-29

    Applicant: LG ELECTRONICS INC.

    Inventor： Seethal Paluri ,  Seunghwan Kim

    IPC: H04N19/117 ,  H04N19/13 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

    Abstract: An image decoding method, according to the present disclosure, enables: acquiring, from a bitstream, image information including prediction mode information and adaptive loop filter (ALF) information including alternative filter information for a chroma component of a current block; deriving prediction samples for the current block on the basis of the prediction mode information; generating reconstructed samples on the basis of the prediction samples; and generating modified reconstructed samples for the chroma component of the current block on the basis of the alternative filter information.

    Intra prediction-based image coding method and apparatus using MPM list
    17.
    发明授权
    Intra prediction-based image coding method and apparatus using MPM list 有权

    公开(公告)号：US12177421B2

    公开(公告)日：2024-12-24

    申请号：US18198095

    申请日：2023-05-16

    Applicant: LG ELECTRONICS INC.

    Inventor： Ling Li ,  Jin Heo ,  Seunghwan Kim

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

    Abstract: A video decoding method according to this document includes deriving a first candidate intra prediction mode based on a first neighboring block located on a left side of a current block, deriving a second candidate intra prediction mode based on a second neighboring block located on an upper side of the current block, constructing a most probable mode (MPM) list for the current block based on the first candidate intra prediction mode and the second candidate intra prediction mode, deriving an intra prediction mode for the current block based on the MPM list, generating predicted samples by performing prediction for the current block based on the intra prediction mode, and generating a reconstructed picture for the current block based on the predicted samples.

    Image coding method and apparatus based on intra prediction using MPM list
    18.
    发明授权
    Image coding method and apparatus based on intra prediction using MPM list 有权

    公开(公告)号：US12177420B2

    公开(公告)日：2024-12-24

    申请号：US18131767

    申请日：2023-04-06

    Applicant: LG Electronics Inc.

    Inventor： Ling Li ,  Jaehyun Lim ,  Jin Heo ,  Jangwon Choi ,  Seunghwan Kim

    IPC: H04N11/02 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

    Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes receiving intra prediction information including at least one of most probable mode (MPM) flag information representing whether to derive an intra prediction mode for a current block based on MPM candidates for the current block or planar flag information representing whether to determine the intra prediction mode for the current block as a planar mode, deriving the intra prediction mode for the current block based on the MPM flag information and the planar flag information, deriving a predicted block for the current block based on the intra prediction mode for the current block, and generating a reconstructed picture based on the predicted block.

    Inter-prediction method and apparatus in image coding system
    19.
    发明授权
    Inter-prediction method and apparatus in image coding system 有权

    公开(公告)号：US12160583B2

    公开(公告)日：2024-12-03

    申请号：US18368336

    申请日：2023-09-14

    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

    Abstract: An image decoding method performed by a decoding apparatus includes the operations: 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.

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