公开(公告)号：US20220182641A1

公开(公告)日：2022-06-09

申请号：US17682744

申请日：2022-02-28

Applicant: LG Electronics Inc.

Inventor： Junghak NAM ,  Jangwon CHOI

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/80 ,  H04N19/169 ,  H04N19/186 ,  H04N19/176 ,  H04N19/46

Abstract: According to an embodiment of the present document, a method for increasing the accuracy of in-loop filtering is proposed. In an example, the filtering accuracy of chroma blocks can be improved on the basis of luma blocks by performing a cross component adaptive loop filtering process.

公开(公告)号：US20210368165A1

公开(公告)日：2021-11-25

申请号：US17390654

申请日：2021-07-30

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Seunghwan KIM ,  Jin HEO

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/82 ,  H04N19/186 ,  H04N19/176

Abstract: A method by which a decoding device performs image decoding, according to the present document, comprises the steps of: deriving an intra prediction mode of the current chroma block in a 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 CCLM parameters on the basis of the downsampled neighboring luma samples and neighboring chroma samples of the current neighboring chroma block, wherein when a color format is 4:2:2, the downsampled luma samples are derived by filtering three adjacent current luma samples.

公开(公告)号：US20210352285A1

公开(公告)日：2021-11-11

申请号：US17277639

申请日：2019-09-20

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Seunghwan KIM ,  Jin HEO

IPC: H04N19/119 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186

Abstract: The method for decoding an image by a decoding device according to the present document may comprise the steps of: acquiring image information comprising partitioning information for a current block; determining, on the basis of the size of the current block, whether to partition the current block; partitioning the current block into subblocks on the basis of the partitioning information, if it is determined that the current block is to be partitioned, and decoding the subblocks; and not partitioning the current block, if it is determined that the current block is not to be partitioned, and decoding the current block, wherein, if the current block is a chroma block, and the size of the current block is at most the minimum size of a chroma block, then it is determined that the current block is not to be partitioned.

公开(公告)号：US20210352281A1

公开(公告)日：2021-11-11

申请号：US17369706

申请日：2021-07-07

Applicant: LG ELECTRONICS INC.

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

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

Abstract: An image decoding method according to the present document derives a left mode, which is a candidate intra prediction mode for a left peripheral block of a current block, derives an upper mode, which is a candidate intra prediction mode for an upper peripheral block of the current block, constructs an MPM list on the basis of the left mode and the upper mode, derives an intra prediction mode of the current block on the basis of the MPM list, generates prediction samples of the current block on the basis of the intra prediction mode, generates a restoration picture of the current block on the basis of the prediction samples, and derives the left mode or the upper mode as one from among candidate intra prediction modes of the MPM list, on the basis of when the left mode and the upper mode are not the same and the left mode and the upper mode are respectively a planar mode and a DC mode.

公开(公告)号：US20210112263A1

公开(公告)日：2021-04-15

申请号：US17044545

申请日：2019-04-01

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI

IPC: H04N19/44 ,  H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: A picture decoding method performed by a decoding apparatus according to the present disclosure includes detecting intra prediction modes of a plurality of luma blocks in a luma region corresponding to a current chroma block, generating a first predicted block for the current chroma block based on a first intra prediction mode of the intra prediction modes of the plurality of luma blocks, generating a second predicted block for the current chroma block based on a second intra prediction mode of the intra prediction modes of the plurality of luma blocks, generating a predicted block for the current chroma block based on a weighted sum using the first predicted block and the second predicted block, and generating a reconstructed block based on the predicted block for the current chroma block.

公开(公告)号：US20200244966A1

公开(公告)日：2020-07-30

申请号：US16853484

申请日：2020-04-20

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jangwon CHOI ,  Jin HEO

IPC: H04N19/132 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

Abstract: A method for decoding an image by a decoding apparatus according to the present invention comprises the steps of: deriving predicted samples by performing prediction on a current block; determining whether the current block is to be divided, on the basis of a size and a maximum transform size of the current block; when the current block is determined to be divided, dividing the current block into transform blocks; deriving transform coefficients of the transform blocks; deriving residual samples by performing an inverse transform procedure for the transform coefficients; and generating a reconstructed picture on the basis of the residual samples and the predicted samples, wherein, when the size of the current block is larger than the maximum transform size, the current block is determined to be divided.

公开(公告)号：US20200177882A1

公开(公告)日：2020-06-04

申请号：US16709471

申请日：2019-12-10

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/13 ,  H04N19/176 ,  H04N19/136 ,  H04N19/60 ,  H04N19/124

Abstract: An image decoding method includes receiving residual information including first size related information for a first residual coefficient and second size related information for a second residual coefficient, setting a Rice parameter of the first size related information and the second size related information as a specific value, deriving available binary values based on the Rice parameter, deriving binary values of the first size related information and the second size related information by decoding the first size related information and the second size related information, deriving values of the first size related information and the second size related information by comparing the binary values and the available binary values, deriving the first residual coefficient and the second residual coefficient based on the values, and reconstructing a current picture based on the first residual coefficient and the second residual coefficient.

公开(公告)号：US20250159198A1

公开(公告)日：2025-05-15

申请号：US18695237

申请日：2022-09-29

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Jaehyun LIM ,  Sunmi YOO ,  Junghak NAM ,  Hyeongmoon JANG ,  Jangwon CHOI

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/137 ,  H04N19/176

Abstract: An image decoding/encoding method and apparatus according to the present disclosure may: generate a candidate list for predicting a first motion vector of a current block; derive a control point vector of the current block on the basis of a candidate index of the current block and the candidate list; correct the control point vector of the current block on the basis of a predetermined delta motion vector; derive the first motion vector of the current block on the basis of the corrected control point vector; and perform inter prediction on the current block by using the first motion vector of the current block.

公开(公告)号：US20250159145A1

公开(公告)日：2025-05-15

申请号：US19022620

申请日：2025-01-15

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/136 ,  H04N19/159 ,  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 identifying a prediction mode of a current block, determining a candidate intra prediction mode for the current block, based on a prediction mode of a neighboring block located around the current block, based on the intra prediction mode of the current block being an intra prediction mode, generating a candidate intra prediction mode list of the current block based on the candidate intra prediction mode, and determine an intra prediction mode of the current block based on the candidate intra prediction mode list. In this case, the candidate intra prediction mode may be determined to be a predetermined intra prediction mode, based on the prediction mode of the neighboring block being an MIP mode.

公开(公告)号：US20250113021A1

公开(公告)日：2025-04-03

申请号：US18940151

申请日：2024-11-07

Applicant: LG Electronics Inc.

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

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

Abstract: A method for decoding an image performed by a decoding apparatus according to the present disclosure comprises the steps of: receiving intra prediction information including at least one of MPM flag information indicating whether to derive an intra prediction mode for a current block on the basis of MPM candidates for the current block, or PLANAR flag information indicating whether to determine the intra prediction mode for the current block as a PLANAR mode; deriving the intra prediction mode for the current block on the basis of the MPM flag information and the PLANAR flag information; deriving a predicted block 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 predicted block.