公开(公告)号：US20220132110A1

公开(公告)日：2022-04-28

申请号：US17441617

申请日：2020-03-23

Applicant: LG ELECTRONICS INC.

Inventor： Seethal PALURI ,  Jaehyun LIM ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/117 ,  H04N19/18 ,  H04N19/169 ,  H04N19/70 ,  H04N19/186 ,  H04N19/174 ,  H04N19/172 ,  H04N19/82 ,  H04N19/176 ,  H04N19/61 ,  H04N19/132

Abstract: According to the disclosure of the present document, LMCS data and/or an ALF parameter can be signaled on the basis of type information from a parameter set. A default LMCS model comprised in the parameter set can be selectively used for an LMCS procedure. Therefore, the amount of data to be signaled for video/image coding is reduced and coding efficiency can be increased.

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：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：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.

公开(公告)号：US20220038741A1

公开(公告)日：2022-02-03

申请号：US17503042

申请日：2021-10-15

Applicant: LG Electronics Inc.

Inventor： Junghak NAM ,  Jaehyun LIM ,  Moonmo KOO ,  Seunghwan KIM

IPC: H04N19/593 ,  H04N19/119 ,  H04N19/159 ,  H04N19/18 ,  H04N19/70 ,  H04N19/176 ,  H04N19/61

Abstract: An image coding method according to the present document comprises the steps of: deriving transform coefficients for a current block on the basis of residual-related information; and generating residual samples of the current block on the basis of the transform coefficients. The residual-related information comprises low frequency non-separable transform (LFNST) index information, showing information relating to non-separable transform for low-frequency transform coefficients of the current block, on the basis of a matrix-based intra-prediction (MIP) flag showing whether or not MIP is applied to the current block. The residual samples are generated from the transform coefficients on the basis of the LFNST index information.

公开(公告)号：US20210344926A1

公开(公告)日：2021-11-04

申请号：US17377160

申请日：2021-07-15

Applicant: LG Electronics Inc.

Inventor： Jaehyun LIM ,  Naeri PARK

IPC: H04N19/137 ,  H04N19/176 ,  H04N19/51 ,  H04N19/513 ,  H04N19/96 ,  H04N19/105

Abstract: In the present invention, an inter-prediction mode based image processing method and an apparatus therefor are disclosed. Specifically, the inter-prediction based image processing method may comprise the steps of: deriving movement information of a control point for specifying a reference block of a current block; dividing the current block into sub-blocks; deriving movement information of the sub-blocks using the movement information of the control point; and generating a prediction block for each sub-block using the movement information of the sub-blocks.

公开(公告)号：US20210281881A1

公开(公告)日：2021-09-09

申请号：US17327242

申请日：2021-05-21

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/60 ,  H04N19/124 ,  H04N19/18 ,  H04N19/176 ,  H04N19/70 ,  H04N19/159

Abstract: An image decoding method comprises the steps of: deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) for the transform coefficients; and generating a restoration picture on the basis of residual samples for the target block, on the basis of an inverse primary transform for the modified transform coefficients, wherein the inverse RST is performed on the basis of: transform sets determined by a mapping relation according to an intra prediction mode applied to the target block; and a transform kernel matrix selected from among two transform kernel matrices included in each of the transform sets, and is performed on the basis of: whether the inverse RST is applied; and a transform index for indicating any one of the transform kernel matrices included in the transform sets.

公开(公告)号：US20210258609A1

公开(公告)日：2021-08-19

申请号：US17240678

申请日：2021-04-26

Applicant: LG Electronics Inc.

Inventor： Byeongmoon JEON ,  Hendry HENDRY ,  Jaehyun LIM ,  Yongjoon JEON ,  Chulkeun KIM ,  Jungsun KIM ,  Seungwook PARK ,  Joonyoung PARK ,  Sangoh JEONG ,  Naeri PARK

IPC: H04N19/593

Abstract: An image decoding method according to the present invention comprises the steps of: acquiring information to form a reference picture set of a current picture by entropy decoding the received bitstream information; and performing prediction on a prediction block inside the current picture by using a reference picture list which is formed based on the reference picture set.

公开(公告)号：US20210258604A1

公开(公告)日：2021-08-19

申请号：US17283926

申请日：2019-10-08

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

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