公开(公告)号：US20240323355A1

公开(公告)日：2024-09-26

申请号：US18733676

申请日：2024-06-04

Applicant: LG ELECTRONICS INC.

Inventor： Jin HEO ,  Sunmi YOO ,  Ling LI ,  Jangwon CHOI ,  Jungah CHOI

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

CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

Abstract: A video decoding method according to the present document is characterized by comprising: obtaining Most Probable Mode (MPM) index information and reference line index information from a bitstream; compiling an MPM list including candidate intra prediction modes for the intra prediction of a current block; deriving an intra prediction mode for the current block from among the candidate intra prediction modes included in the MPM list on the basis of the MPM index information; generating prediction samples for the current block on the basis of the intra prediction mode; and generating reconstructed samples for the current block on the basis of the prediction samples, wherein the step for compiling the MPM list involves deriving a DC mode as one of the candidate intra prediction modes, and including the DC mode in the MPM list, the DC mode being derived on the basis of the value of reference line index information indicating a reference line used for the intra prediction of the current block not being zero.

公开(公告)号：US20240107010A1

公开(公告)日：2024-03-28

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

CPC classification number: 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：US20240056579A1

公开(公告)日：2024-02-15

申请号：US18383327

申请日：2023-10-24

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Seunghwan KIM ,  Jin HEO ,  Sunmi YOO ,  Ling LI ,  Jangwon CHOI

IPC: H04N19/132 ,  H04N19/129 ,  H04N19/176 ,  H04N19/46 ,  H04N19/60

CPC classification number: H04N19/132 ,  H04N19/129 ,  H04N19/176 ,  H04N19/46 ,  H04N19/60

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes receiving a bitstream including residual information; deriving quantized transform coefficients for a current block based on the residual information included in the bitstream; deriving transform coefficients for the current block from the quantized transform coefficients based on an inverse quantization process; deriving residual samples for the current block by applying inverse transform to the derived transform coefficients; and generating a reconstructed picture based on the residual samples for the current block.

公开(公告)号：US20230370642A1

公开(公告)日：2023-11-16

申请号：US18199785

申请日：2023-05-19

Applicant: LG ELECTRONICS INC.

Inventor： Ling LI ,  Jung Hak NAM

IPC: H04N19/61 ,  H04N19/167 ,  H04N19/11 ,  H04N19/122 ,  H04N19/119 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/119 ,  H04N19/122 ,  H04N19/132 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include determining a prediction mode of a current block, generating a prediction block of the current block based on intra block copy (IBC) prediction mode information, basede on the prediction mode of the current block being an IBC prediction mode, determining a size of a transform block of the current block based on a color component of the current block, generating a residual block of the current block based on the size of the transform block; and reconstructing the current block based on the prediction block and the residual block of the current block.

公开(公告)号：US20230308636A1

公开(公告)日：2023-09-28

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: H04N19/105 ,  H04N19/176 ,  H04N19/159

CPC classification number: 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.

公开(公告)号：US20220272351A1

公开(公告)日：2022-08-25

申请号：US17739468

申请日：2022-05-09

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Jin HEO ,  Sunmi YOO ,  Ling LI

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/196

Abstract: A method for decoding a picture based on a cross-component linear model (CCLM) mode includes deriving neighboring luma reference samples of a luma block, deriving down-sampled neighboring luma reference samples, deriving a linear model parameter based on the down-sampled neighboring luma reference samples and the neighboring chroma reference samples, where the neighboring luma reference samples includes top neighboring luma reference samples, and left neighboring luma reference samples, and where when the top boundary of the luma block overlaps with a boundary of a coding tree unit (CTU), the number of the top neighboring luma reference samples used for deriving the down-sampled neighboring luma reference samples among the neighboring luma reference samples is less than that of the left neighboring luma reference samples used for deriving the down-sampled neighboring luma reference samples.

公开(公告)号：US20220264104A1

公开(公告)日：2022-08-18

申请号：US17732087

申请日：2022-04-28

Applicant: LG Electronics Inc.

Inventor： Jungah CHOI ,  Jaehyun LIM ,  Jin HEO ,  Sunmi YOO ,  Ling LI ,  Jangwon CHOI ,  Seunghwan KIM

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/70 ,  H04N19/88

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: receiving a bitstream including residual information of a current block; deriving a specific number of context-encoding bins for context syntax elements for a current sub-block of the current block; decoding the context syntax elements for the current sub-block included in the residual information on the basis of the specific number; deriving transform coefficients for the current sub-block on the basis of the decoded context syntax elements; deriving residual samples for the current block on the basis of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20220150538A1

公开(公告)日：2022-05-12

申请号：US17432372

申请日：2020-02-21

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Jin HEO ,  Seunghwan KIM ,  Sunmi YOO ,  Jungah CHOI ,  Ling LI

IPC: H04N19/593 ,  H04N19/196 ,  H04N19/132 ,  H04N19/11 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method executed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction mode of the current chroma block by means of cross-component linear model (CCLM) mode; deriving downsampled luma samples on the basis of the current luma block; deriving downsampled neighboring luma samples on the basis of neighboring luma samples of the current luma block; and deriving the CCLM parameter on the basis of the downsampled neighboring luma samples and neighboring chroma samples of the current neighboring chroma block, wherein the number of downsampled neighboring luma samples and number of neighboring chroma samples are equal to the previously set thresh-hold value, and the thresh-hold value is derived on the basis of the width and height of the current chroma block.

公开(公告)号：US20220124309A1

公开(公告)日：2022-04-21

申请号：US17431659

申请日：2020-02-28

Applicant: LG ELECTRONICS INC.

Inventor： Jin HEO ,  Sunmi YOO ,  Ling LI ,  Jangwon CHOI ,  Jungah CHOI

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

Abstract: An image decoding method according to the present document comprises the steps of: obtaining, from a bitstream, subpartition mode information indicating whether sub-partition intra prediction is used for a current block; configuring an MPM list including candidate intra prediction modes for deriving an intra prediction mode of the current block; deriving the intra prediction mode of the current block from among the candidate intra prediction modes included in the MPM list on the basis of MPM index information; generating prediction samples for the current block on the basis of the intra prediction mode; and generating reconstructed samples for the current block on the basis of the prediction samples, wherein one of the candidate intra prediction modes in the MPM list is a DC mode, based on the sub-partition mode information indicating that the sub-partition intra prediction is used for the current block.

公开(公告)号：US20220078455A1

公开(公告)日：2022-03-10

申请号：US17418122

申请日：2019-12-27

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jin HEO ,  Junghak NAM ,  Ling LI ,  Jangwon CHOI ,  Jungah CHOI ,  Seunghwan KIM

IPC: H04N19/40 ,  H04N19/13 ,  H04N19/129 ,  H04N19/132 ,  H04N19/88 ,  H04N19/176 ,  H04N19/18

Abstract: A video decoding method performed by a decoding device according to the present document comprises the steps of: entropy decoding residual information for a current block to derive residual coefficients for the current block; rearranging the residual coefficients; deriving residual samples of the current block on the basis of the rearranged residual coefficients; and restoring a current picture on the basis of the residual samples.