公开(公告)号：US20240048759A1

公开(公告)日：2024-02-08

申请号：US18381292

申请日：2023-10-18

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/577 ,  H04N19/109 ,  H04N19/159 ,  H04N19/52 ,  H04N19/139 ,  H04N19/176 ,  H04N19/105 ,  H04N19/132

CPC classification number: H04N19/577 ,  H04N19/109 ,  H04N19/159 ,  H04N19/52 ,  H04N19/139 ,  H04N19/176 ,  H04N19/105 ,  H04N19/132

Abstract: According to a disclosure of the present document, when the type of inter-prediction of a current block is indicated as biprediction, weight index information for a candidate within a merge candidate list or a sub-block merge candidate list may be derived, and coding efficiency may be increased.

公开(公告)号：US20230247189A1

公开(公告)日：2023-08-03

申请号：US18126743

申请日：2023-03-27

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176

CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176

Abstract: A video decoding method performed by a decoding device according to the present document is characterized by including: a step for deriving reference subblocks in a reference picture on the basis of the motion vector of an adjacent block on the left side of the current block; a step for deriving a subblock-based temporal merge candidate for the current block on the basis of motion information about the reference subblocks; a step for forming an affine merge candidate list for the current block, the affine merge candidate list including the subblock-based temporal merge candidate; a step for deriving motion information about subblocks of the current block on the basis of the affine merge candidate list; a step for deriving prediction samples for the current block on the basis of the motion information about the subblocks; and a step for generating a reconstructed picture on the basis of the prediction samples.

公开(公告)号：US20230209041A1

公开(公告)日：2023-06-29

申请号：US17927108

申请日：2021-05-11

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Junghak NAM ,  Hyeongmoon JANG ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/174

CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/174 ,  H04N19/176

Abstract: A multilayer-based image decoding method performed by a decoding device, according to the disclosure of the present document, comprises the steps of: obtaining image information including information related to a reference picture list from a bitstream; deriving the reference picture list on the basis of the information related to the reference picture list; generating prediction samples of a current block by performing prediction on the current block on the basis of a reference picture included in the reference picture list; and generating a reconstructed picture including reconstructed samples on the basis of the prediction samples.

公开(公告)号：US20230113358A1

公开(公告)日：2023-04-13

申请号：US17791062

申请日：2021-05-24

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Hyeongmoon JANG ,  Junghak NAM ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/503 ,  H04N19/172 ,  H04N19/46 ,  H04N19/169

Abstract: According to the disclosure of the present document, image information acquired via a bitstream includes POC information, and a non-reference picture flag related to whether a picture is not used as a reference picture. A POC value of a current picture is derived on the basis of the POC information, and the POC information includes POC information of a previous picture in decoding order for the current picture. The previous picture in the decoding order for deriving the POC value of the current picture may be limited to a picture where a value of the non-reference picture flag is 0. Accordingly, an incorrect POC value can be prevented from being derived in video/image coding.

公开(公告)号：US20230082083A1

公开(公告)日：2023-03-16

申请号：US17977306

申请日：2022-10-31

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/139 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/52

Abstract: According to embodiments of the present document, a prediction procedure may be performed for image/video coding, and the prediction procedure may include symmetric motion vector differences (SMVDs) and merge mode motion vector differences (MMVDs) according to an inter prediction. The inter prediction may be performed on the basis of reference pictures of a current picture, and types (e.g., a long term reference picture, a short term reference picture, etc.) of the reference pictures may be considered for the inter prediction. Therefore, performance and coding efficiency in the prediction procedure can be improved.

公开(公告)号：US20230080150A1

公开(公告)日：2023-03-16

申请号：US17988611

申请日：2022-11-16

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Hyeongmoon JANG ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

Abstract: An image decoding method according to the present document may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross-component linear model (CCLM) mode on the basis of intra prediction mode information; updating the intra prediction mode of the chroma block on the basis of an intra prediction mode of a luma block corresponding to the chroma block; when the chroma block is not square, remapping the updated intra prediction mode to a wide-angle intra prediction mode; and determining an LFNST set including LFNST matrices on the basis of the remapped intra prediction mode.

公开(公告)号：US20220394290A1

公开(公告)日：2022-12-08

申请号：US17887911

申请日：2022-08-15

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

IPC: H04N19/52 ,  H04N19/132 ,  H04N19/176 ,  H04N19/31

Abstract: A method for image decoding performed by a decoding apparatus according to the present disclosure comprises the steps of: deriving an ATMVP candidate for a current block; deriving merge candidates for the current block; deriving prediction samples for the current block on the basis of the merge candidates and the ATMVP candidate; and deriving reconstruction samples for the current block on the basis of the prediction samples, wherein the ATMVP candidate is a spatial neighboring block spatially adjacent to the current block.

公开(公告)号：US20220377346A1

公开(公告)日：2022-11-24

申请号：US17835454

申请日：2022-06-08

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: According to embodiments of the present document, a prediction procedure can be performed for image video coding, and the prediction procedure can comprise merge mode motion vector differences (MMVD) and symmetric motion vector differences (SMVD) according inter prediction. The inter prediction can be performed on the basis of reference pictures of a current picture, and types of the reference pictures (e.g. a long-term reference picture, a short-term reference picture, etc.) can be considered for the inter prediction. Accordingly, performance and coding efficiency in the prediction procedure can be increased.

公开(公告)号：US20220345749A1

公开(公告)日：2022-10-27

申请号：US17853481

申请日：2022-06-29

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

IPC: H04N19/70 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/174 ,  H04N19/176 ,  H04N19/503

Abstract: A decoding method carried out by a decoding device, according to the present document, comprises the steps of: acquiring, from a bitstream, information associated with a prediction mode of a current block; deriving a prediction mode of the current block on the basis of the information associated with the prediction mode; deriving prediction samples of the current block on the basis of the prediction mode; and generating reconstructed samples on the basis of the prediction samples, wherein the bitstream comprises a sequence parameter set, the sequence parameter set comprising a combined inter-picture merge and intra-picture prediction (CIIP) enable flag, and the step for deriving may comprise a step for parsing a regular merge flag from the bitstream on the basis of the satisfying of a condition based on the CIIP enable flag and a condition based on the size of the current block.

公开(公告)号：US20220264101A1

公开(公告)日：2022-08-18

申请号：US17729400

申请日：2022-04-26

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Hyeongmoon JANG ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176

Abstract: A method for image decoding, according to the present document, may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross-component linear model (CCLM) mode; updating the intra prediction mode of the chroma block on the basis of an intra prediction mode of a luma block corresponding to the chroma block; and determining an LFNST set including LFNST matrices on the basis of the updated intra prediction mode, wherein the updated intra prediction mode is derived as an intra prediction mode corresponding to a specific position in the luma block, and the specific position is set on the basis of a color format of the chroma block.