公开(公告)号：US20220286691A1

公开(公告)日：2022-09-08

申请号：US17637290

申请日：2020-08-20

Applicant: LG ELECTRONICS INC.

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

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

Abstract: A video decoding method performed by a decoding apparatus comprises the steps of: acquiring, from a bitstream, residual information for a current transform block, wherein the residual information includes at least one of information indicating a level value of a target transform coefficient within the current transform block or information indicating a residual level value; based on a neighboring transform coefficient of the target transform coefficient, deriving a rice parameter for at least one of the information indicating the level value of the target transform coefficient or the information indicating the residual level value; based on the rice parameter, deriving a bin string for at least one of the information indicating the level value of the target transform coefficient or the information indicating the residual level value; and based on the bin string, deriving the level value of the target transform coefficient.

公开(公告)号：US20220201280A1

公开(公告)日：2022-06-23

申请号：US17442009

申请日：2020-03-23

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jungah CHOI ,  JIn HEO ,  Jangwon CHOI

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/119 ,  H04N19/159 ,  H04N19/61

Abstract: An image encoding/decoding method and apparatus are provided. The image decoding method includes determining whether a prediction mode of a current block is an intra prediction mode based on information on the prediction mode of the current block, determining whether a transform mode of the current block is a transform skip mode, determining whether an intra prediction technique of the current block is intra sub-partitions (ISP) based on the prediction mode of the current block being an intra prediction mode, and generating a transform coefficient block of the current block based on the transform mode of the current block and whether the intra prediction technique of the current block is ISP.

公开(公告)号：US20220191471A1

公开(公告)日：2022-06-16

申请号：US17442912

申请日：2020-03-23

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/132 ,  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 intra prediction information including at least one of MPM flag information, MRL index information, and planner flag information from a bitstream; checking the MPM flag information; checking the MRL index information on the basis of a case where the MPM flag information indicates that the MRL index information is checked; checking the planner flag information on the basis of a case where a value of the MRL index information is 0; deriving an intra prediction mode for a current block on the basis of the check for the planner flag information; deriving prediction samples for the current block on the basis of the intra prediction mode for the current block; and generating a reconstructed picture on the basis of the prediction samples.

公开(公告)号：US20220174284A1

公开(公告)日：2022-06-02

申请号：US17674595

申请日：2022-02-17

Applicant: LG ELECTRONICS INC.

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

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

Abstract: A method for performing video decoding by a decoding device according to the present document comprises the steps of: acquiring residual information of a current block; deriving residual samples of the current block on the basis of the residual information; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20220174275A1

公开(公告)日：2022-06-02

申请号：US17667957

申请日：2022-02-09

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Seunghwan Kim ,  Jin Heo

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/593 ,  H04N19/176 ,  H04N19/46 ,  H04N19/132 ,  H04N19/186

Abstract: A method for image decoding performed by a decoding device according to the present document comprises the steps of: deriving a specific value for a current chroma block; when a width and a height of the current chroma block have a value equal to or greater than the specific value, deriving upper peripheral chroma samples of a number equal to the specific value of the current chroma block and left peripheral chroma samples of a number equal to the specific value; deriving CCLM parameters on the basis of the upper peripheral chroma samples, the left peripheral chroma samples, and down-sampled peripheral luma samples; and deriving prediction samples for the current chroma block on the basis of the down-sampled luma samples and the CCLM parameters, wherein the derived specific value is 2.

公开(公告)号：US20220174269A1

公开(公告)日：2022-06-02

申请号：US17669044

申请日：2022-02-10

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jungah CHOI ,  Jangwon CHOI ,  Seunghwan KIM

IPC: H04N19/103 ,  H04N19/176 ,  H04N19/61

Abstract: A method for decoding an image according to the present document includes obtaining prediction mode information and residual related information from a bitstream, deriving prediction samples of a current block by performing prediction based on the prediction mode information, deriving residual samples of the current block based on the residual related information, and generating reconstruction samples of the current block based on the prediction samples and the residual samples, and the residual related information includes a transform skip flag based on a size of the current block and a maximum transform skip size, the transform skip flag represents whether a transform skip is applied to the current block, and information about the maximum transform skip size is obtained from the bitstream.

公开(公告)号：US20220132102A1

公开(公告)日：2022-04-28

申请号：US17431025

申请日：2020-02-20

Applicant: LG ELECTRONICS INC.

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

IPC: 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：US20210368162A1

公开(公告)日：2021-11-25

申请号：US16981526

申请日：2019-03-15

Applicant: LG Electronics Inc.

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

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

Abstract: An image decoding method according to the present disclosure comprises the steps of: obtaining intra prediction type related information for a current block from a bit stream; deriving the intra prediction type of the current block based on the intra prediction type-related information; obtaining intra prediction mode-related information for the current block from the bitstream; configuring a most probable mode (MPM) list including candidate intra prediction modes for the current block based on neighboring blocks of the current block; deriving the intra prediction mode of the current block based on the MPM list and the intra prediction mode-related information; and generating a predicted block of the current block based on the intra prediction type and the intra prediction mode, wherein when the intra prediction type indicates the particular intra prediction type, the MPM index is parsed from the bit stream without parsing of an MPM flag.

公开(公告)号：US20210352271A1

公开(公告)日：2021-11-11

申请号：US17277621

申请日：2019-09-20

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Seunghwan KIM ,  Jin HEO

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method performed by a decoding device according to the present document comprises: a step for deriving the number of samples of upper peripheral chroma samples and left peripheral chroma samples of a current chroma block on the basis of a specific value and the width and height of the current chroma block; a step for deriving said number of upper peripheral chroma samples and said number of left peripheral chroma samples; and a step for deriving CCLM parameters on the basis of the upper peripheral chroma samples, the left peripheral chroma samples, and down-sampled peripheral luma samples, wherein, when the specific value is derived as 2 and the width and the height of the current chroma block are larger than the specific value, the number of samples is derived as the specific value.

公开(公告)号：US20210337235A1

公开(公告)日：2021-10-28

申请号：US17368005

申请日：2021-07-06

Applicant: LG Electronics Inc.

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

IPC: H04N19/60 ,  H04N19/184 ,  H04N19/176 ,  H04N19/70 ,  H04N19/132

Abstract: A video decoding method performed by a decoding apparatus according to the present document comprises the steps of: receiving a bit stream including residual information of a current block; deriving a specific number of the 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.