公开(公告)号：US20220210430A1

公开(公告)日：2022-06-30

申请号：US17604237

申请日：2020-04-14

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jin HEO ,  Jangwon CHOI ,  Jung Ah CHOI ,  Seung Hwan KIM

IPC: H04N19/137 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include obtaining a residual block of a current block encoded in an intra prediction mode from a bitstream, deriving a modified residual block by performing differential encoding with respect to the residual block, based on differential encoding mode information obtained from the bitstream indicating a differential encoding mode of a residual coefficient, and deriving a residual block of the current block by performing dequantization with respect to the modified residual block.

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：US20220132132A1

公开(公告)日：2022-04-28

申请号：US17569346

申请日：2022-01-05

Applicant: LG ELECTRONICS INC.

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

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

Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring image information including prediction mode information and a residual coding flag; deriving a prediction sample of a current block on the basis of the prediction mode information; on the basis of the residual coding flag, determining whether or not a transform skip residual coding syntax structure is available for the current block within a current slice; deriving a residual sample of the current block by parsing syntax elements for the current block on the basis of a result of the determination; and generating a reconstructed picture on the basis of the prediction sample and the residual sample.

公开(公告)号：US20220124330A1

公开(公告)日：2022-04-21

申请号：US17563776

申请日：2021-12-28

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/172 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/60 ,  H04N19/70

Abstract: A method by which a decoding device decodes an image, according to the present invention, comprises the steps of: receiving a bitstream including residual information; deriving a quantized transform coefficient for a current block on the basis of the residual information included in the bitstream; deriving a residual sample for the current block on the basis of the quantized transform coefficient; and generating a restored picture on the basis of the residual sample for the current 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.

公开(公告)号：US20220078432A1

公开(公告)日：2022-03-10

申请号：US17419650

申请日：2020-01-13

Applicant: LG Electronics Inc.

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

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

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: receiving a bitstream including residual information about a current block; decoding syntax elements for the current block included in the residual information; deriving conversion coefficients for the current block on the basis of the decoded syntax elements; deriving residual samples for the current block on the basis of the conversion coefficients; and generating a restoration picture on the basis of the residual samples.

公开(公告)号：US20220038683A1

公开(公告)日：2022-02-03

申请号：US17278473

申请日：2019-06-24

Applicant: LG ELECTRONICS INC.

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

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

Abstract: A picture decoding method, performed by a decoding apparatus according to the present disclosure, comprises the steps of: when an intra-prediction mode of a chroma block is a cross-component linear model (CCLM) mode, deriving neighboring chroma reference samples with respect to the chroma block; deriving neighboring luma reference samples of a luma block corresponding to the chroma block and luma samples in the luma block; deriving down-sampled neighboring luma reference samples and downsampled luma samples by down sampling the neighboring luma reference samples and the luma samples, respectively; deriving a linear model parameter on the basis of the down-sampled neighboring luma reference samples and the neighboring chroma reference samples; generating prediction samples with respect to the chroma block on the basis of the linear model parameter and the down-sampled luma samples of the luma block; and reconstructing the chroma block on the basis of the prediction samples with respect to the chroma block.

公开(公告)号：US20210344907A1

公开(公告)日：2021-11-04

申请号：US17374274

申请日：2021-07-13

Applicant: LG Electronics Inc.

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

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

Abstract: An image decoding method includes: configuring a MPM list including candidate intra prediction modes for a current block; deriving an intra prediction mode of the current block from the MPM list on the basis of MPM index information indicating an intra prediction mode, among the candidate intra prediction modes included in the MPM list, for the current block; 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 the step for configuring the MPM list comprises, on the basis of the case where the value of reference line index information, representing a reference line used for the intra prediction of the current block, is not zero, deriving a DC mode as one mode among the candidate intra prediction modes, and including same in the MPM list.

公开(公告)号：US20200296391A1

公开(公告)日：2020-09-17

申请号：US16892095

申请日：2020-06-03

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.