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.

公开(公告)号：US12244813B2

公开(公告)日：2025-03-04

申请号：US18611275

申请日：2024-03-20

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/96

Abstract: An image decoding method according to the present document can comprise the steps of: acquiring, from a bitstream, intra prediction mode information and an LFNST index; deriving, as a cross-component linear model (CCLM) mode, an intra prediction mode of a chroma block on the basis of the intra prediction mode information; changing the intra prediction mode of the chroma block from the CCLM mode to an intra prediction mode of a luma block corresponding to the chroma block; determining an LFNST set, including LFNST matrices, on the basis of the intra prediction mode of the luma block; selecting one of the LFNST matrices on the basis of the LFNST set and the LFNST index; and deriving transform coefficients for the chroma block on the basis of the selected LFNST matrix.

公开(公告)号：US12238292B2

公开(公告)日：2025-02-25

申请号：US18387610

申请日：2023-11-07

Applicant: LG Electronics Inc.

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

IPC: H04N19/00 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/196

Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving a context model for a sign flag of a current residual coefficient of a current block; and decoding the sign flag on the basis of the context model, wherein the context model for the sign flag is derived on the basis of a sign flag of a residual coefficient decoded before the current residual coefficient in the current block.

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.

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.

公开(公告)号：US12192468B2

公开(公告)日：2025-01-07

申请号：US17797922

申请日：2021-02-05

Applicant: LG Electronics Inc.

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

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/70

Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring a dependent quantization available flag; and acquiring a transform skip residual coding (TSRC) available flag on the basis of the dependent quantization available flag.

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.

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.

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.

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.