公开(公告)号：US20230319311A1

公开(公告)日：2023-10-05

申请号：US18133799

申请日：2023-04-12

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan KIM ,  Medhi Salehifar ,  Moonmo Koo ,  Jaehyun Lim

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/11 ,  H04N19/593

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/176 ,  H04N19/593

Abstract: The present disclosure, in a method of decoding a video signal, provides a method including checking whether a transform skip is applied to a current block; acquiring a transform index indicating transform types applied to a horizontal direction and a vertical direction of the current block from among a plurality of predefined transform types from the video signal when the transform skip is not applied to the current block; and performing an inverse primary transform on the current block using the transform types indicated by the transform index, wherein the transform types applied to the horizontal direction and the vertical direction of the current block are determined from among transform types defined according to an intra prediction mode of the current block based on the transform index.

公开(公告)号：US20230319295A1

公开(公告)日：2023-10-05

申请号：US18135291

申请日：2023-04-17

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/30 ,  H04N19/124 ,  H04N19/132 ,  H04N19/174 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

CPC classification number: H04N19/30 ,  H04N19/124 ,  H04N19/132 ,  H04N19/174 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

Abstract: According to the disclosure of the present document, scaling list data transferred from an adaptation parameter set (APS) can be signaled through a hierarchical structure, and restrictions are placed on the scaling list data transferred from the APS, whereby the amount of data to be signaled for video/image coding can be reduced, and easiness in implementation can be provided.

公开(公告)号：US20230300342A1

公开(公告)日：2023-09-21

申请号：US18200348

申请日：2023-05-22

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM

IPC: H04N19/139 ,  H04N19/159 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/52 ,  H04N19/91

CPC classification number: H04N19/139 ,  H04N19/159 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/52 ,  H04N19/91

Abstract: A picture decoding method performed by a decoding apparatus according to the present disclosure includes obtaining motion prediction information from bitstream, generating an affine MVP candidate list including affine MVP candidates for a current block, deriving CPMVPs for respective CPs of the current block based on one of the affine MVP candidates included in the affine MVP candidate list, deriving the CPMVDs for the CPs of the current block based on information on CPMVDs for each of the CPs included in the obtained motion prediction information, deriving CPMVs for the CPs of the current block based on the CPMVPs and the CPMVDs, deriving prediction samples for the current block based on the CPMVs, and generating reconstructed samples for the current block based on the derived prediction samples.

公开(公告)号：US20230232010A1

公开(公告)日：2023-07-20

申请号：US18126143

申请日：2023-03-24

Applicant: LG Electronics Inc.

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

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/70 ,  H04N19/88

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/70 ,  H04N19/88

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: receiving a bitstream including residual information of a current block; deriving a specific number of context-encoding bins for context syntax elements for a current sub-block of the current block; decoding the context syntax elements for the current sub-block included in the residual information on the basis of the specific number; deriving transform coefficients for the current sub-block on the basis of the decoded context syntax elements; deriving residual samples for the current block on the basis of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20230224484A1

公开(公告)日：2023-07-13

申请号：US18009610

申请日：2021-06-07

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Hendry HENDRY ,  Seunghwan KIM

IPC: H04N19/423 ,  H04N19/70 ,  H04N19/172

CPC classification number: H04N19/423 ,  H04N19/70 ,  H04N19/172

Abstract: According to the disclosure of the present document, a decoded picture buffer (DPB) may be updated on the basis of DPB-related information. The DPB-related information may include a syntax element related to a maximum required size of the DPB. In updating the DPB, a bumping process may be invoked on the basis of a case where a first condition, in which the number of pictures in the DPB is neither greater than nor equal to a value obtained by adding 1 to a value of the syntax element related to the maximum required size of the DPB, is satisfied.

公开(公告)号：US20230224468A1

公开(公告)日：2023-07-13

申请号：US18124214

申请日：2023-03-21

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

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

CPC classification number: H04N19/132 ,  H04N19/46 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

Abstract: An image decoding method according to the present document may comprise the steps of: receiving flag information, which indicates whether a scaling list is available while an LFNST is being performed, and an LFNST index and residual information for the current block; determining, on the basis of the flag information, the LFNST index, and the tree type of the current block, whether the scaling list is applicable to the current block; deriving transform coefficients for the current block from the residual information on the basis of the determination result; and applying the LFNST to the transform coefficients to derive corrected transform coefficients.

公开(公告)号：US20230224467A1

公开(公告)日：2023-07-13

申请号：US18122552

申请日：2023-03-16

Applicant: LG ELECTRONICS INC.

Inventor： Mehdi SALEHIFAR ,  Seunghwan KIM ,  Moonmo KOO ,  Jaehyun LIM ,  Seethal PALURI

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

CPC classification number: H04N19/18 ,  H04N19/132 ,  H04N19/176

Abstract: A method for decoding an image by a decoding device according to the present invention comprises the steps of: deriving, from a bit stream, transform coefficients of a block to be decoded; deriving residual samples of the block to be decoded, on the basis of a selective transform of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples of the block to be decoded and prediction samples of the block to be decoded, wherein the selective transform is performed on the basis of a modified transform matrix, the modified transform matrix comprises a matrix including a modified basis vector, and the modified basis vector contains a certain number of elements selected from N elements.

公开(公告)号：US20230199220A1

公开(公告)日：2023-06-22

申请号：US18109495

申请日：2023-02-14

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/625 ,  H04N19/129 ,  H04N19/176 ,  H04N19/18

CPC classification number: H04N19/625 ,  H04N19/129 ,  H04N19/176 ,  H04N19/18

Abstract: The present disclosure provides a method of reconstructing a video signal based on a reduced secondary transform, which includes: obtaining a secondary transform index from the video signal; deriving a secondary transform corresponding to the secondary transform index, wherein the secondary transform represents a reduced secondary transform, and the reduced secondary transform represents a transform outputting L (L

公开(公告)号：US20230164359A1

公开(公告)日：2023-05-25

申请号：US18094047

申请日：2023-01-06

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/625 ,  H04N19/129 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/625 ,  H04N19/129 ,  H04N19/176 ,  H04N19/70

Abstract: Embodiments of the present invention provide a video signal processing method and device. Particularly, a method for decoding a video signal, may comprise the steps of: checking whether a transfer skip is applied to a current block; obtaining, from a video signal, a transform index for indicating a transform type set applied to the current block when the transform skip is not applied to the current block, wherein the transform type set includes transform types applied to the current block in horizontal and vertical directions; checking whether the transform type set includes DCT2; determining a region to which a primary transform is applied based on a checking result; and performing an inverse transform on the region to which the primary transform is applied in the horizontal and vertical directions using the transform types included in the transform type set.

公开(公告)号：US20230164355A1

公开(公告)日：2023-05-25

申请号：US17916466

申请日：2021-03-30

Applicant: LG Electronics Inc.

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

IPC: H04N19/60 ,  H04N19/124 ,  H04N19/176 ,  H04N19/11

CPC classification number: H04N19/60 ,  H04N19/124 ,  H04N19/176 ,  H04N19/11

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: acquiring a dependent quantization available flag about whether dependent quantization is available; acquiring a sign data hiding available flag about whether sign data hiding is available; and acquiring, on the basis of the dependent quantization available flag and the sign data hiding available flag, a transform skip residual coding (TSRC) available flag about whether TSRC is available.