公开(公告)号：US20220109831A1

公开(公告)日：2022-04-07

申请号：US17555147

申请日：2021-12-17

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

IPC: H04N19/109 ,  H04N19/52 ,  H04N19/176 ,  H04N19/105 ,  H04N19/159 ,  H04N19/70 ,  H04N19/119

Abstract: The present invention relates to an image decoding and encoding method capable of efficiently performing inter prediction by applying a regular merge mode to a current block, on the basis of a case where an MMVD mode, a merge subblock mode, a CIIP mode, and a partitioning mode, which performs prediction by dividing the current block into two partitions, are not available for the current block.

公开(公告)号：US20220094971A1

公开(公告)日：2022-03-24

申请号：US17542676

申请日：2021-12-06

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：US20220094965A1

公开(公告)日：2022-03-24

申请号：US17542775

申请日：2021-12-06

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Naeri PARK

IPC: H04N19/513 ,  H04N19/109 ,  H04N19/136 ,  H04N19/176 ,  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：US20220086427A1

公开(公告)日：2022-03-17

申请号：US17419917

申请日：2020-01-03

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/513

Abstract: An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: determining that a merge with motion vector difference (MMVD) mode has been applied to a current block that is a current picture referencing (CPR) coding block referring to a current picture; deriving a base motion information candidate for the current block on the basis of candidate blocks neighboring the current block ; generating prediction samples for the current block on the basis of the base motion information candidate; and generating reconstruction samples for the current block on the basis of the prediction samples, wherein the base motion information candidate is derived depending on whether the neighboring candidate blocks are CPR coding blocks.

公开(公告)号：US20220078439A1

公开(公告)日：2022-03-10

申请号：US17476074

申请日：2021-09-15

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/137 ,  H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method includes: deriving an L0 motion vector and a L1 motion vector of the current block; deriving prediction samples of the current block based on the L0 motion vector and the L1 motion vector; and generating reconstructed samples of the current block based on the prediction samples. Deriving the prediction samples includes applying bi-directional optical flow (BDOF) to the current block based on whether the condition for applying BDOF to the current block is satisfied, and the application condition of the BDOF includes a condition whereby the values of L0 luma weighted prediction flag information and L1 luma weighted prediction flag information are both zero, where the a value of each of the L0 luma weighted prediction flag information and L1 luma weighted prediction flag information being 0 represents that a weight factor for each of a L0 and L1 prediction luma components does not exist, respectively.

公开(公告)号：US20220070466A1

公开(公告)日：2022-03-03

申请号：US17472170

申请日：2021-09-10

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

Abstract: An image decoding method includes: deriving a refined L0 motion vector and a refined L1 motion vector by applying decoder-side motion vector refinement (DMVR) based on an L0 motion vector and an L1 motion vector of a current block, deriving prediction samples for the current block based on L0 prediction samples derived based on the refined L0 motion vector and L1 prediction samples derived based on the refined L1 motion vector, and generating reconstructed samples for the current block based on the prediction samples. The L0 prediction samples are derived based on an L0 reference picture and the refined L0 motion vector, and the L1 prediction samples are derived based on an L1 reference picture and the refined L1 motion vector, and deriving the prediction samples comprises determining whether to apply bi-directional optical flow (BDOF) process based on a first POC difference and a second POC difference are the same.

公开(公告)号：US20220038732A1

公开(公告)日：2022-02-03

申请号：US17461617

申请日：2021-08-30

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Junghak NAM

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

Abstract: Embodiments in the present specification provide an encoding and decoding method of a video signal for inter-prediction. A decoding method according to an embodiment of the present specification includes: a step for acquiring, from first coding information about a first level unit, a first flag related to whether second motion vector difference (MVD) information is encoded among first MVD information for predicting a first direction and the second MVD information for predicting a second direction; a step for acquiring, from second coding information about a second level unit lower than the first level unit, a second flag related to whether a symmetric MVD (SMVD) is applied to the current block on the basis of the first flag; a step for determining the first MVD with respect to the current block on the basis of the first MVD information; a step for determining the second MVD on the basis of the second flag; a step for determining a first motion vector and a second motion vector on the basis of the first MVD and the second MVD; and a step for generating a prediction sample of the current block on the basis of the first motion vector and the second motion vector.

公开(公告)号：US20210136363A1

公开(公告)日：2021-05-06

申请号：US17149217

申请日：2021-01-14

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG

IPC: H04N19/107 ,  H04N19/176 ,  H04N19/18 ,  H04N19/124 ,  H04N19/105

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes deriving a temporal motion information candidate of a sub-block unit for a current block by determining whether the temporal motion information candidate of the sub-block unit can be derived based on the size of the current block, constructing a motion information candidate list for the current block based on the temporal motion information candidate of the sub-block unit, and generating prediction samples of the current block by deriving motion information of the current block based on the motion information candidate list, wherein the temporal motion information candidate of the sub-block unit for the current block is derived based on motion vectors of a sub-block unit of a corresponding block located correspondingly to the current block in a reference picture, and the corresponding block is derived in the reference picture based on a motion vector of a spatial neighboring block of the current block.

公开(公告)号：US20210076062A1

公开(公告)日：2021-03-11

申请号：US17100125

申请日：2020-11-20

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG

IPC: H04N19/52 ,  H04N19/176 ,  H04N19/139 ,  H04N19/46 ,  H04N19/159

Abstract: A method for decoding an image by a decoding apparatus according to the present disclosure comprises the steps of: acquiring prediction-related information of a current block; configuring a motion information candidate list of the current block; deriving, as motion information of the current block, a motion information candidate indicated by a candidate index among motion information candidates included in the motion information candidate list; deriving a motion vector difference (MVD) of the current block on the basis of a look-up table (LUT) and index information of an MVD; deriving modified motion information of the current block on the basis of the motion information and the MVD; and predicting the current block on the basis of the modified motion information, wherein the prediction-related information includes the candidate index and the index information of the MVD.

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.