公开(公告)号：US20220337841A1

公开(公告)日：2022-10-20

申请号：US17639262

申请日：2020-08-31

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Junghak NAM

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176 ,  H04N19/46

Abstract: According to one embodiment of the present document, cross-component filter coefficients for cross-component filtering can be derived. Modified filtered reconstructed chroma samples can be generated on the basis of the cross-component filter coefficients. The present embodiment can improve the accuracy of in-loop filtering.

公开(公告)号：US20220321887A1

公开(公告)日：2022-10-06

申请号：US17765935

申请日：2020-10-05

Applicant: LG Electronics Inc.

Inventor： Sunmi YOO ,  Jungah CHOI ,  Jangwon CHOI

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

Abstract: According to disclosures of the present document, dependency conditions can defined for effectively parsing/signaling syntax elements having dependency to transform skip- and/or palette coding-related data, and, on the basis of the dependency conditions, whether or not to parse the transform skip- and/or palette coding-related data can be determined. As a result, bits necessary to be signaled for video/image coding can be reduced and coding efficiency can be improved.

公开(公告)号：US20220279189A1

公开(公告)日：2022-09-01

申请号：US17474919

申请日：2021-09-14

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon JANG ,  Jin HEO ,  Jung Hak NAM ,  Jangwon CHOI

IPC: H04N19/136 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176 ,  H04N19/96

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure comprises determining whether to apply intra prediction to a current chroma block based on information on prediction of the current chroma block, deriving an intra prediction mode of the current chroma block based on an intra prediction mode of a corresponding luma block corresponding to the current chroma block and intra chroma prediction mode information of the current chroma block, when intra prediction applies to the current chroma block, and generating a prediction block of the current chroma block, by performing intra prediction based on the intra prediction mode of the current chroma block. When the intra prediction mode of the corresponding luma block is not present, the intra prediction mode of the current chroma block is derived based on a default intra prediction mode.

公开(公告)号：US20220217333A1

公开(公告)日：2022-07-07

申请号：US17703366

申请日：2022-03-24

Applicant: LG Electronics Inc.

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

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

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：US20220210476A1

公开(公告)日：2022-06-30

申请号：US17603543

申请日：2020-08-26

Applicant: LG Electronics Inc.

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

IPC: H04N19/70 ,  H04N19/176 ,  H04N19/132 ,  H04N19/12 ,  H04N19/18 ,  H04N19/60

Abstract: A method for decoding a video performed by a decoding device according to the present document is characterized by comprising: a step for acquiring video information including residual syntax elements for a current residual coefficient in a current block; a step for deriving the current residual coefficient on the basis of the residual syntax elements; and a step for deriving a reconstructed sample of the current block on the basis of the current residual coefficient.

公开(公告)号：US20220182663A1

公开(公告)日：2022-06-09

申请号：US17441759

申请日：2020-03-18

Applicant: LG Electronics Inc.

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

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/11 ,  H04N19/70 ,  H04N19/105

Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving an intra prediction type for a current block from among intra prediction types; constituting an intra prediction mode candidate list of the current block on the basis of intra prediction modes of neighboring blocks of the current block; deriving an intra prediction mode of the current block on the basis of the intra prediction mode candidate list; and generating prediction samples of the current block on the basis of the intra prediction type and the intra prediction mode.

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.