公开(公告)号：US20220116594A1

公开(公告)日：2022-04-14

申请号：US17561446

申请日：2021-12-23

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/105 ,  H04N19/196 ,  H04N19/176 ,  H04N19/159

Abstract: According to the disclosure of the present document, when the inter-prediction type of the current block indicates biprediction, weight index information for a candidate in a merge candidate list or sub-block merge candidate list can be derived, and coding efficiency can be raised.

公开(公告)号：US20220103810A1

公开(公告)日：2022-03-31

申请号：US17550616

申请日：2021-12-14

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/132 ,  H04N19/176 ,  H04N19/137 ,  H04N19/527

Abstract: According to a disclosure of the present document, when the type of inter-prediction of a current block is indicated as biprediction, weight index information for a candidate within a merge candidate list or a sub-block merge candidate list may be derived, and coding efficiency may be increased.

公开(公告)号：US20220086449A1

公开(公告)日：2022-03-17

申请号：US17535095

申请日：2021-11-24

Applicant: LG Electronics Inc.

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

IPC: H04N19/132 ,  H04N19/186 ,  H04N19/18 ,  H04N19/176

Abstract: An image decoding method according to the present document is characterized by including: a step for receiving a bitstream including residual information; a step for deriving transform coefficients for a target block on the basis of the residual information; a step for deriving corrected transform coefficients on the basis of an inverse non-separable transform of the transform coefficients; and a step for deriving residual samples for the target block on the basis of an inverse primary transform of the corrected transform coefficients, wherein the inverse non-separable transform is performed when the size of the target block is equal to or smaller than the size of a prescribed maximum transform application block.

公开(公告)号：US20220070487A1

公开(公告)日：2022-03-03

申请号：US17470899

申请日：2021-09-09

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/52 ,  H04N19/132 ,  H04N19/577 ,  H04N19/70 ,  H04N19/176 ,  H04N19/105

Abstract: An image decoding method includes: acquiring, from a bitstream, luma weight L0 flag information indicating whether there is an L0 prediction-related weight factor and luma weight L1 flag information indicating whether there is an L1 prediction-related weight factor; determining to apply decoder-side motion vector refinement (DMVR) to an L0 motion vector and L1 motion vector for a current block, when the luma weight L0 flag information and the luma weight L1 flag information are both zero; when it has been determined to apply DMVR, deriving a refined L0 motion vector and a refined L1 motion vector by applying the DMVR to the current block; deriving prediction samples for the current block on the basis of L0 prediction using the refined L0 motion vector and L1 prediction using the refined L1 motion vector; and generating reconstruction samples for the current block on the basis of the prediction samples.

公开(公告)号：US20220070472A1

公开(公告)日：2022-03-03

申请号：US17418378

申请日：2019-12-31

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jin HEO ,  Ling LI ,  Jangwon CHOI ,  Jungah CHOI ,  Seunghwan KIM ,  Junghak NAM

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/132 ,  H04N19/167

Abstract: A method for decoding a video performed by a decoding device according to the present document comprises: a step for receiving residual information for a current block; a step for parsing one sign flag for a current sub-block of the current block, wherein the one sign flag indicates whether all signs of non-zero residual coefficients of the current sub-block are the same; a step for deriving the non-zero residual coefficients on the basis of sign information for the non-zero residual coefficients when the value of the one sign flag is 1; a step for deriving residual samples on the basis of the non-zero residual coefficients; and a step for restoring a current picture on the basis of the residual samples.

公开(公告)号：US20220060687A1

公开(公告)日：2022-02-24

申请号：US17413419

申请日：2019-12-18

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/105 ,  H04N19/139 ,  H04N19/577 ,  H04N19/573 ,  H04N19/176

Abstract: A video processing method according to an embodiment of the present disclosure includes obtaining motion information and bi-directional prediction weight information for inter prediction of a current block, deriving a prediction sample of the current block based on the motion information and the bi-directional prediction weight information, and updating an HMVP candidate list based on a history-based motion vector predictor (HMVP) candidate including the motion information and the bi-directional prediction weight information. The motion information includes a first reference index and a first motion vector related to a first reference picture and a second reference index and a second motion vector related to a second reference picture. The bi-directional prediction weight information may be used to derive a first weight value applied to a first prediction sample from the first reference picture and a second weight value applied to a second prediction sample from the second reference picture.

公开(公告)号：US20220038734A1

公开(公告)日：2022-02-03

申请号：US17278481

申请日：2019-09-20

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE ,  Junghak NAM ,  Naeri PARK ,  Jaehyun LIM ,  Hyeongmoon JANG

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

Abstract: Embodiments of the present specification provide a method and a device for processing a video signal. A method for processing an image signal, according to an embodiment of the present specification, comprises the steps of: generating a merge candidate list including a first motion vector and a second motion vector from a spatial merge candidate or a temporal merge candidate of a current block; adding, to the merge candidate list, a third motion vector determined as the average value of the first motion vector and the second motion vector, if the number of merge candidates of the merge candidate list is smaller than the maximum number of merge candidates; and generating a prediction sample of the current block by using a motion vector indicated by a merge index in the merge candidate list.

公开(公告)号：US20210321109A1

公开(公告)日：2021-10-14

申请号：US17353137

申请日：2021-06-21

Applicant: LG Electronics Inc.

Inventor： Ling LI ,  Jaehyun LIM ,  Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/132 ,  H04N19/119 ,  H04N19/46 ,  H04N19/159 ,  H04N19/176

Abstract: A video decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: receiving a bitstream including information about merge data of a current block; checking mh intra flag information for mh intra prediction which is included in the information about the merge data; checking information about a merge triangle prediction on the basis of a checking result that a value of the mh intra flag information is related to checking the information about the merge triangle prediction included in the information about the merge data; deriving prediction samples for the current block on the basis of a result of checking the information about the merge triangle prediction; and generating a reconstructed picture on the basis of the prediction samples.

公开(公告)号：US20210297677A1

公开(公告)日：2021-09-23

申请号：US16319637

申请日：2016-07-26

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Junghak NAM

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/593 ,  H04N19/105

Abstract: An intra-prediction method according to the present invention comprises the steps of: acquiring intra-prediction mode information from a bitstream; deriving neighboring reference samples of a current block; determining an intra-directional mode for the current block; deriving a predicted block for the current block based on the intra-directional mode and the neighboring reference samples; deriving template reference samples based on the neighboring reference samples; a template reference block based on the template reference samples; and generating a modified predicted block based on the predicted block and the template reference block. The present invention can generate a modified predicted block based on an intra-predicted block and a template reference block, thereby improving the intra-prediction performance.

公开(公告)号：US20210274207A1

公开(公告)日：2021-09-02

申请号：US17242646

申请日：2021-04-28

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/513 ,  H04N19/115 ,  H04N19/176

Abstract: An image decoding method performed by a decoding apparatus, includes deriving a history-based motion vector prediction (HMVP) buffer for a current block based on a history, and deriving motion information of the current block based on an HMVP candidate included in the HMVP buffer, thereby increasing inter prediction efficiency.