公开(公告)号：US11451821B2

公开(公告)日：2022-09-20

申请号：US17559417

申请日：2021-12-22

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/52 ,  H04N19/139 ,  H04N19/109 ,  H04N19/176 ,  H04N19/105 ,  H04N19/132 ,  H04N19/573 ,  H04N19/172 ,  H04N19/70

Abstract: According to embodiments according to the present document, merge mode motion vector differences (MMVD) and symmetric motion vector differences (SMVD) may be performed on the basis of reference picture types and, in particular, short-term reference pictures may be used. Accordingly, prediction performance and coding efficiency in an inter prediction mode may be increased.

公开(公告)号：US20220295105A1

公开(公告)日：2022-09-15

申请号：US17639129

申请日：2020-08-31

Applicant: LG ELECTRONICS INC.

Inventor： SUNMI YOO ,  Junghak Nam ,  Seunghwan Kim ,  Jie Zhao

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

Abstract: According to the disclosure of the present document, an escape value may be effectively binarized on the basis of a maximum value of an escape value, which may be inferred by a quantization parameter in a palette mode. Accordingly, in a palette mode, the length of a bin may be adjusted or the number bits may be saved, according to a maximum value of an escape value, whereby coding efficiency may be improved.

公开(公告)号：US20220248018A1

公开(公告)日：2022-08-04

申请号：US17719925

申请日：2022-04-13

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun Lim ,  Junghak Nam ,  Seunghwan Kim

IPC: H04N19/12 ,  H04N19/132 ,  H04N19/159 ,  H04N19/61 ,  H04N19/70 ,  H04N19/96

Abstract: An image decoding method according to the present document comprises a step for performing inverse first-order transform and inverse non-separable transform on a residual sample. The inverse non-separable transform is performed on the basis of a transform index indicating a predetermined transform kernel matrix, the inverse first-order transform is performed on the basis of a multiple transform selection (MTS) index indicating MTS for a horizontal transform kernel and a vertical transform kernel, and a syntax element bin string for the transform index is derived on the basis of first context information when a tree type for a split structure of a target block is not a single tree type and is derived on the basis of second context information when the tree type is the single tree type.

公开(公告)号：US11330267B2

公开(公告)日：2022-05-10

申请号：US17120716

申请日：2020-12-14

Applicant: LG ELECTRONICS INC.

Inventor： Junghak Nam

IPC: H04N19/13 ,  H04N19/46 ,  H04N19/70 ,  H04N19/176

Abstract: A picture decoding method performed by a decoding device according to an embodiment of the present disclosure comprises the steps of: deriving a context index for a split flag syntax element on the basis of split availability information of a current block; determining a context model on the basis of the derived context index; decoding a value of the split flag syntax element on the basis of a CABAC, using the determined context model; deriving a current coding unit from the current block on the basis of the value of the split flag syntax element; deriving a predicted block on the basis of inter prediction or intra prediction for the current coding unit; and generating a reconstructed block on the basis of the predicted block.

公开(公告)号：US11310534B2

公开(公告)日：2022-04-19

申请号：US17356016

申请日：2021-06-23

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Junghak Nam

IPC: H04N19/176 ,  H04N19/82 ,  H04N19/117 ,  H04N19/85

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: generating a restoration picture on the basis of prediction samples of a coding block; deriving a boundary strength (BS) for a boundary of the coding block in the restoration picture; performing deblocking filtering on the boundary of the coding block on the basis of the boundary strength; and deriving a modified restoration picture for the restoration picture on the basis of the deblocking filtering, wherein the boundary strength is derived on the basis of a prediction mode of a first block and a second block that are adjacent to the boundary of the coding block, and the prediction mode of the first block or the second block is derived on the basis of whether the prediction mode of the first block or the second block is a current picture referencing (CPR) mode to be coded in reference to a current picture.

公开(公告)号：US20220103830A1

公开(公告)日：2022-03-31

申请号：US17550376

申请日：2021-12-14

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  H04N19/176

Abstract: According to embodiments of the present document, symmetric motion vector differences (SMVDs) and merge mode motion vector differences (MMVDs) according to an inter prediction mode may be performed on the basis of reference picture types and, particularly, short term reference pictures may be used. Therefore, prediction performance and coding efficiency in the inter prediction mode can be improved.

公开(公告)号：US11233996B2

公开(公告)日：2022-01-25

申请号：US16971883

申请日：2018-02-22

Applicant: LG Electronics Inc.

Inventor： Junghak Nam ,  Jaehyun Lim

IPC: H04N11/02 ,  H04N19/119 ,  H04N19/105 ,  H04N19/176 ,  H04N19/51 ,  H04N19/91

Abstract: Provided is a video decoding method performed by a decoding apparatus, which includes: obtaining split information for a target block from a bitstream; splitting the target block into a first sub-block and a second sub-block based on a split boundary indicated by the split information; deriving a first motion information candidate list for the first sub-block and a second motion information candidate list for the second sub-block based on the split information for the target block; performing inter prediction of the first sub-block based on the first motion information candidate list; and performing inter prediction of the second sub-block based on the second motion information candidate list, in which the first sub-block and the second sub-block are non-rectangular blocks, and the first motion information candidate list for the first sub-block is different from the second motion information candidate list for the second sub-block.

公开(公告)号：US11228783B2

公开(公告)日：2022-01-18

申请号：US17124231

申请日：2020-12-16

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho Lee ,  Junghak Nam ,  Naeri Park ,  Hyeongmoon Jang

IPC: H04N19/52 ,  H04N19/119 ,  H04N19/176

Abstract: An image decoding method according to the present document includes obtaining motion prediction information for a current block from a bitstream, generating an affine MVP candidate list for the current block, deriving CPMVPs for CPs of the current block based on the affine MVP candidate list, deriving CPMVDs for the CPs of the current block based on the motion prediction information, deriving CPMVs for the CPs of the current block based on the CPMVPs and the CPMVDs, and deriving prediction samples for the current block based on the CPMVs.

公开(公告)号：US11057640B2

公开(公告)日：2021-07-06

申请号：US16767925

申请日：2018-11-28

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Seethal Paluri ,  Junghak Nam ,  Jungdong Seo ,  Jaeho Lee ,  Hyeongmoon Jang

IPC: H04N19/56 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186

Abstract: A video decoding method performed by a decoding apparatus includes obtaining information regarding inter-prediction of a current block via a bitstream; forming an MVP candidate list based on neighbouring blocks of the current block; deriving costs with respect to MVP candidates that are included in the MVP candidate list; deriving a revised MVP candidate list based on the costs with respect to the MVP candidates; deriving MVP of the current block based on the revised MVP candidate list; deriving a motion vector of the current block based on the MVP and MVD of the current block; and performing prediction on the current block based on a reference picture index and the motion vector of the current block. The information regarding inter-prediction includes the reference picture index and the MVD.

公开(公告)号：US10805631B2

公开(公告)日：2020-10-13

申请号：US16335116

申请日：2017-09-22

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho Lee ,  Junghak Nam ,  Jaehyun Lim

IPC: H04N19/577 ,  H04N19/122 ,  H04N19/176 ,  H04N19/96 ,  H04N19/567 ,  H04N19/70 ,  H04N19/192 ,  H04N19/109 ,  H04N19/11 ,  H04N19/136

Abstract: The present invention relates to a method for performing bi-prediction using a template-based weight, comprising the steps of: determining a template region for performing bi-prediction of a current block; calculating an uncorrelation factor on the basis of the template region, wherein the uncorrelation factor denotes a value indicating the uncorrelation between a template of the current block and a template of a reference block; determining a first weight parameter of the current block on the basis of the uncorrelation factor; and obtaining a first prediction value of the current block using the weight parameter.