公开(公告)号：US20220124330A1

公开(公告)日：2022-04-21

申请号：US17563776

申请日：2021-12-28

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/172 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/60 ,  H04N19/70

Abstract: A method by which a decoding device decodes an image, according to the present invention, comprises the steps of: receiving a bitstream including residual information; deriving a quantized transform coefficient for a current block on the basis of the residual information included in the bitstream; deriving a residual sample for the current block on the basis of the quantized transform coefficient; and generating a restored picture on the basis of the residual sample for the current block.

公开(公告)号：US20220116645A1

公开(公告)日：2022-04-14

申请号：US17555190

申请日：2021-12-17

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/139 ,  H04N19/132 ,  H04N19/119 ,  H04N19/70

Abstract: The present disclosure relates to an image decoding and encoding method which can efficiently perform inter-prediction by applying a regular merge mode to the current block on the basis of the case in which an MMVD mode, a merge sub-block mode, a CIIP mode, and a partitioning mode, in which prediction is performed by dividing the current block into two partitions, are not available for the current block.

公开(公告)号：US20220116614A1

公开(公告)日：2022-04-14

申请号：US17556551

申请日：2021-12-20

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/186 ,  H04N19/109

Abstract: According to disclosure of the present document, an LMCS procedure can be used for blocks having various block tree structures, and memories used in the LMCS procedure can be reduced (limited).

公开(公告)号：US20220109878A1

公开(公告)日：2022-04-07

申请号：US17428016

申请日：2020-02-06

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/625 ,  H04N19/176 ,  H04N19/119 ,  H04N19/12 ,  H04N19/157

Abstract: A method and device for processing a video signal using a reduced transform are provided. A method for decoding a video signal includes splitting a current block into a plurality of subblocks based on a first flag for a split direction of the current block, determining a subblock, to which a transform is applied, among the plurality of subblocks based on a second flag for a position of a transform target block, determining a transform target area in the subblock, and applying an inverse transform including a horizontal transform and a vertical transform to transform coefficients of the transform target area. The transform target area is determined based on a transform type applied to the subblock and a size of the subblock.

公开(公告)号：US20220103848A1

公开(公告)日：2022-03-31

申请号：US17546499

申请日：2021-12-09

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/46 ,  H04N19/70 ,  H04N19/132 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: obtaining image information; and generating a reconstructed picture on the basis of the image information.

公开(公告)号：US20220086490A1

公开(公告)日：2022-03-17

申请号：US17430496

申请日：2020-02-12

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/61 ,  H04N19/625 ,  H04N19/46 ,  H04N19/176

Abstract: Embodiments of the present disclosure provide a method and apparatus for processing a video signal. A method for decoding a video signal according to an embodiment of the present disclosure includes obtaining a sub-block transform (SBT) flag indicating whether an SBT is applied, wherein the SBT represents a transform applied to one of sub-blocks split from a coding unit, determining a transform unit from the coding unit based on the SBT flag, determining a size value of the transform unit as a first reference value if DST-7 (Discrete Sine Transform type 7) or DCT-8 (Discrete Cosine Transform type 8) is applied and the size value of the transform unit is greater than the first reference value and less than a third reference value and determining the size value as a second reference value if DCT-2 (Discrete Cosine Transform type 2) is applied and the size value is equal to or greater than the third reference value, wherein the third reference value is greater than the second reference value and the second reference value is greater than the first reference value, obtaining transform coefficients based on the size value, and performing an inverse transform on the transform coefficients. A data processing time and the amount of data necessary for a transform can be reduced by performing coding in consideration of a region reduced according to a block size.

公开(公告)号：US20220078455A1

公开(公告)日：2022-03-10

申请号：US17418122

申请日：2019-12-27

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/40 ,  H04N19/13 ,  H04N19/129 ,  H04N19/132 ,  H04N19/88 ,  H04N19/176 ,  H04N19/18

Abstract: A video decoding method performed by a decoding device according to the present document comprises the steps of: entropy decoding residual information for a current block to derive residual coefficients for the current block; rearranging the residual coefficients; deriving residual samples of the current block on the basis of the rearranged residual coefficients; and restoring a current picture on the basis of the residual samples.

公开(公告)号：US20220078449A1

公开(公告)日：2022-03-10

申请号：US17526930

申请日：2021-11-15

Applicant: LG ELECTRONICS INC.

Inventor： Mehdi SALEHIFAR ,  Seunghwan KIM

IPC: H04N19/159 ,  H04N19/70 ,  H04N19/132 ,  H04N19/176

Abstract: An image decoding method according to the present document may comprise the steps of: receiving flag information indicating whether or not matrix-based intra prediction (MIP) is to be used for a current block; receiving matrix-based intra prediction (MIP) mode information on the basis of the flag information; generating intra prediction samples for the current block on the basis of the MIP mode information; and generating reconstructed samples for the current block on the basis of the intra prediction samples, wherein a syntax element bin string for the MIP mode information is binarized by using a truncated binarization method.

公开(公告)号：US20220078432A1

公开(公告)日：2022-03-10

申请号：US17419650

申请日：2020-01-13

Applicant: LG Electronics Inc.

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

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

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: receiving a bitstream including residual information about a current block; decoding syntax elements for the current block included in the residual information; deriving conversion coefficients for the current block on the basis of the decoded syntax elements; deriving residual samples for the current block on the basis of the conversion coefficients; and generating a restoration picture on the basis of the residual samples.

公开(公告)号：US20220070494A1

公开(公告)日：2022-03-03

申请号：US17420196

申请日：2020-01-02

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/625 ,  H04N19/105 ,  H04N19/132 ,  H04N19/70 ,  H04N19/18 ,  H04N19/176

Abstract: A method for processing a video signal includes determining a horizontal transform type index for a horizontal transform kernel and a vertical transform type index for a vertical transform kernel of a transform block in the video signal, determining a transform region in which a significant transform coefficient exists in the transform block based on the horizontal transform type index, the vertical transform type index, and a size of the transform block, and applying inverse-transform to the transform region based on the horizontal transform type index and the vertical transform type index. A width of the transform region is determined based on a comparison between the horizontal transform type index and a reference value, and a height of the transform region is determined based on a comparison between the vertical transform type index and the reference value.