公开(公告)号：US20230047175A1

公开(公告)日：2023-02-16

申请号：US17968311

申请日：2022-10-18

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon JANG

IPC: H04N19/109 ,  H04N19/186 ,  H04N19/70 ,  H04N19/176

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise determining prediction mode characteristic information based on a color format of a current block, determining a prediction mode type of a lower-layer block split from the current block based on the prediction mode characteristic information, obtaining the lower-layer block by splitting the current block based on the prediction mode type of the lower-layer block, and decoding the lower-layer block based on the prediction mode type of the lower-layer block. The prediction mode type of the lower-layer block comprises a first prediction mode type specifying that both an intra prediction mode and an inter prediction mode are available, a second prediction mode type specifying that only the intra prediction mode is available and a third prediction mode type specifying that only the inter prediction mode is available. Based on a first condition for the current block being satisfied, the prediction mode characteristic information has a first value, and the first condition comprises a case where a color format of the current block is a monochrome format or a 4:4:4 format. Based on the first condition for the current block being not satisfied, the prediction mode characteristic information has a second value or a third value based on at least one of a color format, split mode or size of the current block.

公开(公告)号：US20220286689A1

公开(公告)日：2022-09-08

申请号：US17630028

申请日：2020-08-05

Applicant: LG ELECTRONICS INC.

Inventor： Jung Hak NAM ,  Nae Ri PARK ,  Hyeong Moon JANG

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises determining an inter prediction technique applying to a current block based on a prediction mode of the current block being an inter prediction mode, deriving a motion information candidate of the current block based on a type of the determined inter prediction technique, deriving motion information of the current block based on motion information of the derived motion information candidate, and generating a prediction block for the current block by performing inter prediction on the current block based on the motion information of the current block. The motion information candidate may comprise an interpolation filter index.

公开(公告)号：US20220279200A1

公开(公告)日：2022-09-01

申请号：US17703696

申请日：2022-03-24

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon JANG ,  Jungah CHOI

IPC: H04N19/46 ,  H04N19/124 ,  H04N19/105 ,  H04N19/176

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method may comprise determining a residual coding method of a current transform block corresponding to a current coding block, reconstructing residual information of the transform block based on the determined residual coding method and reconstructing the current transform block based on the residual information.

公开(公告)号：US20220279165A1

公开(公告)日：2022-09-01

申请号：US17703291

申请日：2022-03-24

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon JANG

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises determining whether bi-directional optical flow (BDOF) or prediction refinement with optical flow (PROF) applies to a current block, based on BDOF or PROF applying to the current block, fetching a prediction sample of the current block from a reference picture of the current block based on motion information of the current block, and deriving a refined prediction sample for the current block, by applying BDOF or PROF to the current block based on the fetched prediction sample.

公开(公告)号：US20220272346A1

公开(公告)日：2022-08-25

申请号：US17696619

申请日：2022-03-16

Applicant: LG ELECTRONICS INC.

Inventor： Nae Ri PARK ,  Junk Hak NAM ,  Hyeong Moon JANG

IPC: H04N19/132 ,  H04N19/176 ,  H04N19/137 ,  H04N19/105 ,  H04N19/513

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises deriving a prediction sample of a current block based on motion information of the current block, deriving a reference picture resampling (RPR) condition for the current block, determining whether prediction refinement with optical flow (PROF) applies to the current block based on the RPR condition, and deriving a refined prediction sample for the current block by applying PROF to the current block.

公开(公告)号：US20220182606A1

公开(公告)日：2022-06-09

申请号：US17564640

申请日：2021-12-29

Applicant: LG Electronics Inc.

Inventor： Nae Ri PARK ,  Jung Hak NAM ,  Hyeong Moon JANG

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may comprise constructing an affine merge candidate list for a current block, based on an inter prediction mode of the current block being an affine merge mode, selecting one affine merge candidate from the affine merge candidate list, deriving motion information of the current block based on motion information of the selected affine merge candidate, generating a prediction block of the current block based on the motion information of the current block, and reconstructing the current block based on the prediction block of the current block. The constructing the affine merge candidate list may comprise deriving a constructed affine merge candidate, and the deriving the constructed affine merge candidate may comprise deriving a weight index for bi-prediction of the constructed affine merge candidate.

公开(公告)号：US20250106439A1

公开(公告)日：2025-03-27

申请号：US18976949

申请日：2024-12-11

Applicant: LG Electronics Inc.

Inventor： Jung Hak NAM ,  Hendry HENDRY ,  Hyeong Moon JANG ,  Seung Hwan KIM

IPC: H04N19/70 ,  H04N19/30 ,  H04N19/503

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises determining whether a video parameter set (VPS) referenced by a sequence parameter set (SPS) is present, deriving information on inter layer prediction, based on the determination as to whether the video parameter set referenced by the sequence parameter set is present, and reconstructing an image based on the information on inter layer prediction.

公开(公告)号：US20250071258A1

公开(公告)日：2025-02-27

申请号：US18723700

申请日：2023-04-12

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon JANG ,  Nae Ri PARK ,  Jung Hak NAM

IPC: H04N19/105 ,  H04N19/139 ,  H04N19/176 ,  H04N19/513

Abstract: An image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium storing a bitstream are provided. The image decoding method performed by an image decoding apparatus, according to the present disclosure, comprises the steps of: on the basis of whether or not reordering of prediction candidates in a merge mode with motion vector difference (MMVD) mode is activated, determining whether or not to reorder the prediction candidates; identifying a prediction candidate indicated by prediction candidate identification information from the prediction candidates or the reordered prediction candidates; and deriving an offset of the MMVD mode on the basis of the identified prediction candidate, wherein the prediction candidate identification information is acquired from a bitstream.

公开(公告)号：US20240406387A1

公开(公告)日：2024-12-05

申请号：US18723772

申请日：2023-01-02

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Hyeong Moon JANG ,  Sunmi YOO ,  Jungah CHOI

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593

Abstract: An image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium for storing a bitstream are provided. The image decoding method according to the present disclosure is an image decoding method performed by an image decoding device, and may comprise the steps of: deriving multiple direct mode (DM) candidates for a chroma block; determining one DM candidate among the multiple DM candidates on basis of first information; and performing intra prediction of the chroma block on the basis of the determined DM candidate, wherein default modes for the chroma block are modified on the basis of whether same are identical to the multiple DM candidates.

公开(公告)号：US20240323365A1

公开(公告)日：2024-09-26

申请号：US18619945

申请日：2024-03-28

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon JANG ,  Jin HEO

IPC: H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593

CPC classification number: H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise identifying a current chroma block by splitting an image, identifying whether a matrix based intra prediction mode applies to a first luma sample position corresponding to the current chroma block, identifying whether a predetermined prediction mode applies to a second luma sample position corresponding to the current chroma block, based on the matrix based intra prediction mode doing not apply, and determining an intra prediction mode candidate of the current chroma block based on an intra prediction mode applying to a third luma sample position corresponding to the current chroma block, based on the predetermined prediction mode doing not apply.