公开(公告)号：US20240357130A1

公开(公告)日：2024-10-24

申请号：US18701082

申请日：2022-12-09

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Jaehyun LIM ,  Junghak NAM ,  Jangwon CHOI

IPC: H04N19/159 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176 ,  H04N19/59 ,  H04N19/80

CPC classification number: H04N19/159 ,  H04N19/117 ,  H04N19/139 ,  H04N19/176 ,  H04N19/59 ,  H04N19/80

Abstract: An image decoding method performed by a decoding device, according to the present disclosure, comprises the steps of: deriving an intra block copy (IBC) mode as a prediction mode of a current block; deriving one or more block vectors and/or scaling information for the IBC mode; deriving a revised reference block for the current block by using the one or more block vectors and/or the scaling information in a current picture; deriving a prediction sample of the current block on the basis of the revised reference block; and generating a reconstructed picture on the basis of the prediction sample.

公开(公告)号：US20240283936A1

公开(公告)日：2024-08-22

申请号：US18569068

申请日：2022-07-01

Applicant: LG Electronics Inc.

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

IPC: H04N19/132 ,  H04N19/136 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/132 ,  H04N19/136 ,  H04N19/186 ,  H04N19/70

Abstract: Provided are an image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium which stores a bitstream. An image decoding method according to the present disclosure may be an image decoding method performed by an image decoding device, the method comprising the steps of: determining whether a cross component sample adaptive offset (CC-SAO) is activated, on the basis of a value of a first syntax element; deriving collocated luma samples and collocated chroma samples corresponding to each other from reconstructed samples on the basis of a chroma format of the reconstructed samples, on the basis of the value of the first syntax element specifying that the CC-SAO is activated; and determining an offset to be applied to the reconstructed samples on the basis of the collocated luma samples and the collocated chroma samples.

公开(公告)号：US20240275992A1

公开(公告)日：2024-08-15

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

CPC classification number: 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：US20240244257A1

公开(公告)日：2024-07-18

申请号：US18391092

申请日：2023-12-20

Applicant: LG ELECTRONICS INC.

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

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

CPC classification number: H04N19/593 ,  H04N19/105 ,  H04N19/11 ,  H04N19/132 ,  H04N19/176

Abstract: An image decoding method according to the present document comprises the steps of: acquiring, from a bitstream, reference line index information indicating a reference line to be used for intra prediction of a current block; constructing a most probable mode (MPM) list by deriving candidate intra prediction modes of the current block on the basis of the value of the reference line index information; deriving the intra prediction mode of 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 restoration samples for the current block on the basis of the prediction samples, wherein, on the basis of the case in which the value of the reference line index information is not zero, one of the candidate intra prediction modes is a DC mode and the number of candidate intra prediction modes including the DC mode is 5.

公开(公告)号：US20240236315A1

公开(公告)日：2024-07-11

申请号：US18612610

申请日：2024-03-21

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Junghak NAM

IPC: H04N19/117 ,  H04N19/132 ,  H04N19/169 ,  H04N19/174 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/50 ,  H04N19/70 ,  H04N19/80

CPC classification number: H04N19/117 ,  H04N19/132 ,  H04N19/174 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/1883 ,  H04N19/50 ,  H04N19/70 ,  H04N19/80

Abstract: According to one embodiment of the present document, an in-loop filtering procedure in an image/video coding procedure may comprise a cross-component adaptive loop filtering procedure. CCALF, according to the present embodiment, can increase the accuracy of in-loop filtering.

公开(公告)号：US20240205444A1

公开(公告)日：2024-06-20

申请号：US18593762

申请日：2024-03-01

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/46 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/46 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: An image decoding method performed by a decoding device according to the present document is characterized by comprising the steps of: acquiring image information including a Block-based Delta Pulse Code Modulation (BDPCM) available flag; and generating a reconstructed picture on the basis of the image information, wherein the BDPCM available flag relates to whether BDPCM is available for chroma and luma blocks.

公开(公告)号：US20240098261A1

公开(公告)日：2024-03-21

申请号：US18520912

申请日：2023-11-28

Applicant: LG Electronics Inc.

Inventor： Junghak NAM ,  Jangwon CHOI

IPC: H04N19/117 ,  H04N19/132 ,  H04N19/169 ,  H04N19/186 ,  H04N19/46 ,  H04N19/80

CPC classification number: H04N19/117 ,  H04N19/132 ,  H04N19/186 ,  H04N19/1883 ,  H04N19/46 ,  H04N19/80

Abstract: According to one embodiment of the present document, a cross component adaptive loop filtering (CCALF) process may be performed. The CCALF process can enhance the filtering performance for chroma components and improve the subjective/objective image quality of a picture.

公开(公告)号：US20240015282A1

公开(公告)日：2024-01-11

申请号：US18371319

申请日：2023-09-21

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/105 ,  H04N19/96

CPC classification number: H04N19/186 ,  H04N19/176 ,  H04N19/105 ,  H04N19/96

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：US20230396772A1

公开(公告)日：2023-12-07

申请号：US18234710

申请日：2023-08-16

Applicant: LG Electronics Inc.

Inventor： Jin HEO ,  Hyeong Moon JANG ,  Jangwon CHOI

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

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

Abstract: An image encoding/decoding method and apparatus include features of generating a prediction block by performing intra prediction on a current block, determining whether to apply position dependent intra prediction combination (PDPC) to the prediction block, and generating a final prediction block of the current block, by applying PDPC to the prediction block based on the determination. The determining whether to apply PDPC to the prediction block may include determining whether a size of the current block satisfies a predetermined condition. Based on the size of the current block satisfying the predetermined condition, it may be determined to apply PDPC to the prediction block. Based on the size of the current block not satisfying the predetermined condition, a determination of a color component of the current block may be skipped and it may be determined not to apply PDPC to the prediction block.

公开(公告)号：US20230370599A1

公开(公告)日：2023-11-16

申请号：US18225984

申请日：2023-07-25

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/70 ,  H04N19/12

CPC classification number: H04N19/124 ,  H04N19/12 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/70 ,  H04N19/159

Abstract: An image decoding method according to the present document 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 reconstructed picture on the basis of the residual sample for the current block, wherein the residual information may be derived via different syntax elements depending on whether a transform has been applied to the current block.