公开(公告)号：US20210306639A1

公开(公告)日：2021-09-30

申请号：US17257795

申请日：2019-07-05

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM

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

Abstract: Provided is an image decoding method performed by a decoding apparatus, which includes: decoding a first coding tree unit (CTU) in a current picture; storing motion information of the first CTU in a line buffer; and decoding a second CTU in the current picture by using the motion information of the first CTU stored in the line buffer, in which the first CTU is located around a left side of the second CTU or located around a top of the second CTU.

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.

公开(公告)号：US20210219001A1

公开(公告)日：2021-07-15

申请号：US17219184

申请日：2021-03-31

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

IPC: H04N19/70 ,  H04N19/176 ,  H04N19/52

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: decoding, on the basis of a bitstream, an affine flag that indicates whether affine prediction is applicable to a current block and a sub-block TMVP flag that indicates whether a temporal motion vector predictor based on a sub-block of the current block is usable; determining whether to decode a predetermined merge mode flag that indicates whether to apply a predetermined merge mode to the current block, on the basis of the decoded affine flag and the decoded sub-block TMVP flag; deriving prediction samples of the current block on the basis of the determining of whether to decode the predetermined merge mode flag; and generating reconstructed samples of the current block based on the prediction samples of the current block.

公开(公告)号：US20210112262A1

公开(公告)日：2021-04-15

申请号：US17044536

申请日：2019-04-01

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG

IPC: H04N19/44 ,  H04N19/70 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: A method for parallel processing of color components of a video signal and an apparatus therefor are disclosed. Specifically, there is provided a method for decoding images based on an intra prediction mode, the method comprising: parsing a syntax element indicating whether a CCLM (cross-component linear model) intra prediction on a current chroma block is disabled or not; deriving an intra prediction mode applied to the current chroma block; and generating a prediction sample for the current chroma block based on the intra prediction mode, wherein, when the CCLM intra prediction is disabled, the intra prediction mode is derived in a predetermined first prediction mode set, when the CCLM intra prediction is not disabled, the intra prediction mode is derived in a predetermined second prediction mode set, and the second prediction mode set includes intra prediction modes included in the first prediction mode set and the CCLM intra prediction mode.

公开(公告)号：US20210037238A1

公开(公告)日：2021-02-04

申请号：US16766982

申请日：2018-11-27

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Jungdong SEO ,  Jaeho LEE ,  Hyeongmoon JANG

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/159 ,  H04N19/182

Abstract: An image decoding method that is performed by a decoding apparatus according to the present disclosure comprises the steps of: forming a merge candidate list based on neighbouring blocks of a current block; deriving costs with respect to merge candidates included in the merge candidate list; deriving a revised merge candidate list based on the costs with respect to the merge candidates; deriving movement information of the current block based on the revised merge candidate list; and performing prediction on the current block based on the movement information, wherein the neighbouring blocks include spatial neighbouring blocks and temporal neighbouring blocks.

公开(公告)号：US20210029373A1

公开(公告)日：2021-01-28

申请号：US17065822

申请日：2020-10-08

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/513 ,  H04N19/44

Abstract: An image decoding method according to the present disclosure includes deriving a history-based motion vector prediction (HMVP) buffer for a current block, deriving motion information of the current block based on an HMVP candidate included in the HMVP buffer, generating prediction samples for the current block based on the motion information, and generating reconstructed samples based on the prediction samples, and the HMVP buffer is initialized when processing a first-ordered CTU in a CTU row in which a current CTU is located, and the current block is included in the current CTU.

公开(公告)号：US20210021860A1

公开(公告)日：2021-01-21

申请号：US17060582

申请日：2020-10-01

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Naeri PARK

IPC: H04N19/513 ,  H04N19/109 ,  H04N19/176 ,  H04N19/136 ,  H04N19/587

Abstract: In the present disclosure, a method of decoding a video signal and a device therefor are disclosed. Specifically, a method of decoding an image based on an inter prediction mode includes deriving a motion vector of an available spatial neighboring block around a current block; deriving a collocated block of the current block based on the motion vector of the spatial neighboring block; deriving a motion vector in a sub-block unit in the current block based on a motion vector of the collocated block; and generating a prediction block of the current block using the motion vector derived in the sub-block unit, wherein the collocated block may be specified by the motion vector of the spatial neighboring block in one pre-defined reference picture.

公开(公告)号：US20210021840A1

公开(公告)日：2021-01-21

申请号：US16323488

申请日：2017-08-08

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/174 ,  G06T9/40 ,  H04N19/176 ,  H04N19/122 ,  H04N19/70 ,  H04N19/96 ,  H04N19/64

Abstract: The present invention relates to an image processing method and an apparatus therefor. Specifically, a method for decoding an image may comprise the steps of: decoding a first split flag indicating whether to split a first block using a binary tree structure; when the first split flag indicates that the first block is split, decoding split mode information indicating the direction in which the first block is split; checking whether a second block split from the first block is a square block, according to the split mode information; and when, as a result of the checking, it is determined that the second block is a square block, decoding a second split flag indicating whether to split the second block using a quad tree structure.

公开(公告)号：US20190246131A1

公开(公告)日：2019-08-08

申请号：US16331807

申请日：2017-08-31

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Hyeongmoon JANG ,  Jaehyun LIM

IPC: H04N19/51 ,  H04N19/176 ,  H04N19/70 ,  H04N19/91

Abstract: An inter-prediction method according to the present invention comprises the steps of: deriving a first movement vector of the current block; deriving prediction samples for the current block on the basis of the first movement vector; deriving a subunit located in the current block and adjacent to the target boundary of same; deriving a first reference unit on the basis of the subunit and first movement vector; deriving a second movement vector of a neighboring block adjacent to the target boundary; deriving a second reference unit on the basis of the subunit and second movement vector; and deriving the modified prediction samples on the basis of weighted sum of the first reference unit and second reference unit. According to the present invention, by increasing the effectiveness of inter-prediction at the block boundary, amount of data required for residual data can be reduced and the overall coding efficiency can be increased.

公开(公告)号：US20180213224A1

公开(公告)日：2018-07-26

申请号：US15746139

申请日：2016-04-22

Applicant: LG Electronics Inc.

Inventor： Eunyong SON ,  Yongjoon JEON ,  Jin HEO ,  Seungwook PARK ,  Moonmo KOO ,  Hyeongmoon JANG

IPC: H04N19/11 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/96 ,  H04N19/52

CPC classification number: H04N19/11 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/593 ,  H04N19/96

Abstract: An intra prediction method performed by a decoding device, according to the present invention, comprises the steps of: deriving an intra prediction mode for a current block; deriving neighboring samples of the current block; and generating a prediction sample for the current block by using at least one of the neighboring samples according to the intra prediction mode, wherein the derived neighboring samples include left neighboring samples, upper left neighboring samples, upper neighboring samples, right neighboring samples, lower right neighboring samples, and lower neighboring samples of the current block. According to the present invention, intra prediction performance can be improved by using expanded neighboring reference samples, and coding efficiency for CUs can be improved.