公开(公告)号：US20210360227A1

公开(公告)日：2021-11-18

申请号：US17277926

申请日：2019-09-23

Applicant: LG ELECTRONICS INC.

Inventor： Jane ZHAO ,  Seethal PALURI ,  Seunghwan KIM

IPC: H04N19/105 ,  H04N19/137 ,  H04N19/46 ,  H04N19/176

Abstract: Disclosed are a method for processing video signals and an apparatus therefor. Specifically, the method for processing video signals on the basis of inter prediction comprises the steps of: inducing a motion vector predictor using motion data of a neighboring block of the current block; parsing layer data indicating the current layer to which a motion vector difference used in inter prediction of the current block belongs, in a previously defined layer structure in which the combination of one or more horizontal and vertical components of motion vector differences are divided into multiple layers; parsing index data indicating a particular combination within the current layer; inducing a motion vector difference of the current block using the layer data and index data; and inducing the motion vector for the current block by adding the motion vector difference to the motion vector predictor.

公开(公告)号：US20210352285A1

公开(公告)日：2021-11-11

申请号：US17277639

申请日：2019-09-20

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Seunghwan KIM ,  Jin HEO

IPC: H04N19/119 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186

Abstract: The method for decoding an image by a decoding device according to the present document may comprise the steps of: acquiring image information comprising partitioning information for a current block; determining, on the basis of the size of the current block, whether to partition the current block; partitioning the current block into subblocks on the basis of the partitioning information, if it is determined that the current block is to be partitioned, and decoding the subblocks; and not partitioning the current block, if it is determined that the current block is not to be partitioned, and decoding the current block, wherein, if the current block is a chroma block, and the size of the current block is at most the minimum size of a chroma block, then it is determined that the current block is not to be partitioned.

公开(公告)号：US20210344959A1

公开(公告)日：2021-11-04

申请号：US17329749

申请日：2021-05-25

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/18 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/11 ,  H04N19/132

Abstract: An image decoding method according to the present document 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, on the basis of an inverse primary transform for the modified transform coefficients, a restoration picture based on residual samples for the target block, wherein the modified transform coefficients derived according to the inverse RST are two-dimensionally arranged according to the order of a row priority direction or a column priority direction according to an intra prediction mode to be applied to the target block.

公开(公告)号：US20210329301A1

公开(公告)日：2021-10-21

申请号：US17350790

申请日：2021-06-17

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: A video decoding method according to the present document is characterized by comprising: a step for deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; a step for deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) of the transform coefficients; and a step for generating a reconstructed picture on the basis of residual samples for the target block on the basis of an inverse primary transform of the modified transform coefficients, wherein the inverse RST using a transform kernel matrix is performed on transform coefficients of the upper-left 4×4 region of an 8×8 region of the target block, and the modified transform coefficients of the upper-left 4×4 region, upper-right 4×4 region, and lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

公开(公告)号：US20210297700A1

公开(公告)日：2021-09-23

申请号：US17327246

申请日：2021-05-21

Applicant: LG Electronics Inc.

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

IPC: H04N19/60 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/96

Abstract: An image decoding method according to the present document comprises a step of deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) regarding transform coefficients regarding a target block. The inverse RST is performed on the basis of transform sets determined on the basis of a mapping relation following an intra prediction mode applied to the target block, and a transform kernel matrix selected from two transform kernel matrices included in the transform sets, respectively, and is performed on the basis of whether or not the inverse RST is applied, and a transform index indicating one of the transform kernel matrices included in the transform sets. A syntax element bin string regarding the transform index is decoded on the basis of a different context set according to the tree type regarding the division structure of the target block.

公开(公告)号：US20210266549A1

公开(公告)日：2021-08-26

申请号：US17316049

申请日：2021-05-10

Applicant: LG Electronics Inc.

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

IPC: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/91

Abstract: An image decoding method performed by means of a decoding device according to the present disclosure comprises the steps of: deriving transform coefficients of a target block from a bitstream; deriving a non-separable secondary transform (NSST) index with respect to the target block; performing inverse transform with respect to the transform coefficients of the target block on the basis of the NSST index and thus deriving residual samples of the target block; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20210211727A1

公开(公告)日：2021-07-08

申请号：US17188791

申请日：2021-03-01

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/625 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  H04N19/176

Abstract: An image decoding method according to the present invention comprises the steps of: deriving quantized transform coefficients for a current block from a bitstream; deriving transform coefficients by performing inverse quantization on the basis of the quantized transform coefficients; deriving residual samples for the current block by performing inverse transform on the basis of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples, wherein the inverse transform comprises acquiring information relating to multiple transform selection (MTS) from the bitstream, and is performed using a transform kernel set derived on the basis of the information relating to the MTS.

公开(公告)号：US20210037266A1

公开(公告)日：2021-02-04

申请号：US17073047

申请日：2020-10-16

Applicant: LG Electronics Inc.

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

IPC: H04N19/96 ,  H04N19/70 ,  H04N19/176 ,  H04N19/119

Abstract: Disclosed are a method for decoding a video signal and an apparatus therefor. Specifically, a method for decoding an image may include: partitioning a current coding tree block into a plurality of coding blocks so that coding blocks partitioned from the current coding tree block are included in a current picture when the current coding tree block is out of a boundary of the current picture; parsing a first syntax element indicating whether a current coding block is partitioned into a plurality of subblocks when the current coding block satisfies a predetermined condition; and determining a split mode of the current coding block based on the syntax element.

公开(公告)号：US20210021848A1

公开(公告)日：2021-01-21

申请号：US17060598

申请日：2020-10-01

Applicant: LG ELECTRONICS INC.

Inventor： Junghak NAM ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/96 ,  H04N19/132 ,  H04N19/169 ,  H04N19/176

Abstract: A video decoding method includes: when a current block satisfies a preconfigured condition, parsing a first syntax element indicating whether the current block is split into a plurality of sub-blocks; when the first syntax element indicates that the current block is split, parsing a second syntax element indicating whether the current block is split using a quad-tree structure; when the second syntax element indicates that the current block is not split using the quad-tree structure, parsing at least one of a third syntax element indicating whether the current block is split using a binary-tree structure or a ternary-tree structure and a fourth syntax element indicating a split direction of the current block; and determining a split mode of the current block based on at least one of the first syntax element, the second syntax element, the third syntax element and the fourth syntax element.

公开(公告)号：US20200314444A1

公开(公告)日：2020-10-01

申请号：US16772645

申请日：2018-12-13

Applicant: LG Electronics Inc.

Inventor： Jaeho LEE ,  Seunghwan KIM

IPC: H04N19/52 ,  H04N19/132 ,  H04N19/139 ,  H04N19/577

Abstract: An image decoding method performed by a decoding device according to the present disclosure comprises: a step of deriving reference picture list 0 (L0) and reference picture list 1 (L1); a step of deriving two motion vectors (MV) for a current block, the two MVs including MVL0 for the L0 and MVL1 for the L1; a step of determining whether to apply bi-prediction optical flow (BIO) prediction for deriving refined motion vectors by sub-blocks to the current block; a step of deriving a refined motion vector for a sub-block of the current block based on the MVL0 and MVL1, if the BIO prediction is applied to the current block; and a step of deriving a prediction sample based on the refined motion vector.