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    Intra prediction method and apparatus in image coding system
    1.
    发明授权
    Intra prediction method and apparatus in image coding system 有权

    公开(公告)号：US12250371B2

    公开(公告)日：2025-03-11

    申请号：US18530895

    申请日：2023-12-06

    Applicant: LG ELECTRONICS INC.

    Inventor： Ling Li ,  Seunghwan Kim ,  Jin Heo

    IPC: H04N19/11 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

    Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: obtaining a reference sample line index of a current block and most probable mode (MPM)-related information; constructing an alternative MPM list on the basis of the reference sample line index; deriving an intra prediction mode of the current block on the basis of the alternative MPM list and the MPM-related information; and generating a predicted block of the current block on the basis of the intra prediction mode, wherein the alternative MPM list is constructed on the basis of an intra prediction mode of an upper adjacent block of the current block and an intra prediction mode of a left adjacent block of the current block.

    Method for decoding image on basis of CCLM prediction in image coding system, and device therefor
    3.
    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
    5.
    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.

    Intra prediction-based video coding method and device using MPM list
    6.
    发明授权
    Intra prediction-based video coding method and device using MPM list 有权

    公开(公告)号：US12192517B2

    公开(公告)日：2025-01-07

    申请号：US18230925

    申请日：2023-08-07

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/11 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/593

    Abstract: A video decoding method according to the present document comprises the steps of: configuring an MPM list by deriving candidate intra prediction modes on the basis of a first neighboring block located on the left side and a second neighboring block located on the upper side with respect to the current block; deriving an intra prediction mode for the current block on the basis of the MPM list; generating prediction samples for the current block on the basis of the intra prediction mode; and generating a reconstructed picture for the current block on the basis of the prediction samples, wherein a first intra prediction mode of the first neighboring block and a second intra prediction mode of the second neighboring block are the same, wherein the candidate intra prediction modes including a DC mode are derived on the basis of a case where both the first intra prediction mode and the second intra prediction mode are the DC mode.

    Intra prediction-based image coding method and apparatus using MPM list
    8.
    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
    9.
    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.

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