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：US20210120265A1

公开(公告)日：2021-04-22

申请号：US17124041

申请日：2020-12-16

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE ,  Junghak NAM

IPC: H04N19/52 ,  H04N19/139 ,  H04N19/176 ,  H04N19/157

Abstract: A method for processing a video signal using an affine motion prediction is disclosed. The method includes checking that a current block is encoded by the affine motion prediction, obtaining motion vectors for a plurality of control points of the current block, determining a motion vector for each of a plurality of subblocks included in the current block based on the motion vectors for the plurality of control points, and performing a prediction for the current block from the motion vector for each of the plurality of subblocks, wherein each of the plurality of subblocks is configured to have a pre-defined width and a pre-defined height.

公开(公告)号：US20210105481A1

公开(公告)日：2021-04-08

申请号：US17124989

申请日：2020-12-17

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan KIM ,  Seethal PALURI ,  Jaeho LEE

IPC: H04N19/137 ,  H04N19/132 ,  H04N19/70 ,  H04N19/46 ,  H04N19/176

Abstract: Disclosed are a method for processing a video signal and an apparatus therefor. Specifically, a method for processing a video signal by using affine prediction may comprise the steps of: checking whether the affine prediction is applied to a current block; when it is confirmed that the affine prediction is applied to the current block, acquiring at least one syntax element indicating a resolution of a motion vector difference used for the affine prediction; deriving a motion vector of a control point of the current block on the basis of the at least one syntax element; deriving a motion vector of each of multiple sub-blocks included in the current block on the basis of the motion vector of the control point; and generating a prediction sample of the current block by using the motion vector of each of the sub-blocks.

公开(公告)号：US20200275094A1

公开(公告)日：2020-08-27

申请号：US16870352

申请日：2020-05-08

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/129 ,  H04N19/176

Abstract: A method by which a decoding apparatus performs image decoding, according to the present document, comprises the steps of: obtaining motion prediction information about a current block from a bitstream; generating an affine MVP candidate list for the current block; deriving CPMVPs for CPs of the current block on the basis of the affine MVP candidate list; deriving CPMVDs for the CPs of the current block on the basis of the motion prediction information; deriving CPMVs for the CPs of the current block on the basis of the CPMVPs and the CPMVDs; and deriving prediction samples for the current block on the basis of the CPMVs.

公开(公告)号：US20200260072A1

公开(公告)日：2020-08-13

申请号：US16818677

申请日：2020-03-13

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/423 ,  H04N19/533 ,  H04N19/70

Abstract: According to an embodiment disclosed in the present specification, a history-based motion vector prediction (HMVP) candidate set with respect to a current block may be derived based on a history, the HMVP candidate set may be updated or initialized according to a condition, and motion information of the current block may be derived based on the HMVP candidate set, through which inter prediction efficiency can be improved.

公开(公告)号：US20200053387A1

公开(公告)日：2020-02-13

申请号：US16346775

申请日：2016-11-04

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE

IPC: H04N19/577 ,  H04N19/52 ,  H04N19/172 ,  H04N19/573

Abstract: Disclosed is a method for processing an image based on an inter prediction and an apparatus for the same. Particularly, the method may include generating a bi-directional predictor of each pixel of a current block by performing a bi-directional inter prediction based on a motion vector of the current block; deriving a first motion vector from a window area of a specific size in a first reference picture for a current pixel, and deriving a second motion vector from a window area of a specific size in a second reference picture for the current pixel; deriving a first predictor for the current pixel using the first motion vector, and deriving a second predictor for the current pixel using the second motion vector; and generating a third predictor of each pixel of the current block by performing a weighted sum of the first predictor and the second predictor.

公开(公告)号：US20200007891A1

公开(公告)日：2020-01-02

申请号：US16475002

申请日：2016-12-28

Applicant: LG Electronics Inc. ,  EWHA UNIVERSITY-INDUSTRY COLLABORATION FOUNDATION

Inventor： Je-Won KANG ,  Soo Kyung RYU ,  Jaehyun LIM ,  Sunmi YOO ,  Jaeho LEE ,  Min-Joo KANG

IPC: H04N19/593 ,  H04N19/174 ,  H04N19/18 ,  H04N19/132 ,  H04N19/182

Abstract: Disclosed is a method for encoding/decoding a still image or moving image based on an intra-prediction mode and an apparatus supporting the same. Particularly, a method for processing an image based on an intra prediction mode may include determining an intra prediction mode set used for an intra prediction in a current prediction processing unit among multiple intra prediction mode sets having different resolutions with each other, wherein the resolution represents a degree of distribution of the intra prediction mode in the intra prediction mode set; deriving an intra prediction mode applied to the current prediction processing unit in the determined intra prediction mode set using index information received from an encoder; and generating a prediction sample of the current prediction processing unit based on the derived intra prediction mode, and each of the intra prediction mode sets includes one or more intra prediction modes.

公开(公告)号：US20190342547A1

公开(公告)日：2019-11-07

申请号：US16475538

申请日：2018-01-03

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/105 ,  H04N19/147 ,  H04N19/139 ,  H04N19/46 ,  H04N19/96 ,  H04N19/176

Abstract: The present invention provides a method of processing a video signal including a current block using an affine prediction mode, including generating a candidate list of motion vector pairs using the motion vector of a pixel or block neighboring at least two control points of the current block, wherein the control point means a corner pixel of the current block, and the motion vector pair indicates the motion vectors of a top left corner pixel and top right corner pixel of the current block; determining a final candidate list of a predetermined number of motion vector pairs based on a divergence value of the motion vector pair, wherein the final candidate list is determined in order of smaller divergence value, and the divergence value is a value indicating similarity in the direction of motion vectors; determining the control point motion vector of the current block based on a rate-distortion cost from the final candidate list; and generating the motion vector predictor of the current block based on the control point motion vector.

公开(公告)号：US20190238880A1

公开(公告)日：2019-08-01

申请号：US16332203

申请日：2017-09-11

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE

IPC: H04N19/513 ,  H04N19/573 ,  H04N19/176 ,  H04N19/119

Abstract: The present invention provides a method for decoding a video signal on the basis of an optical flow motion vector, comprising the steps of: when a bi-directional prediction is performed for a current block, acquiring a gradient map corresponding to the current block, wherein the gradient map represents a set of gradients at all pixel positions within a block having a larger size than the current block, and each gradient includes an X-axis gradient component and a Y-axis gradient component; determining an optical flow motion vector by applying a weight factor to the X-axis gradient component and the Y-axis gradient component; acquiring an optical flow predictor on the basis of the optical flow motion vector; and reconstructing the video signal by using the optical flow predictor.

公开(公告)号：US20190230364A1

公开(公告)日：2019-07-25

申请号：US16336397

申请日：2017-09-28

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE ,  Hyeongmoon JANG

IPC: H04N19/159 ,  H04N19/119 ,  H04N19/96 ,  H04N19/176 ,  H04N19/70

Abstract: The present invention provides a method for performing bidirectional prediction on a current block by using a weight index, the method comprising the steps of: determining whether the number of pixels of the current block is less than or equal to a threshold number of pixels; determining a weight index or a weight value of the current block on the basis of a weight index of a neighboring block if the number of pixels of the current block is less than or equal to the threshold number of pixels; obtaining a bidirectional predicted value for the current block on the basis of the weight index or the weight value of the current block; and restoring the current block by using the bidirectional predicted value, wherein the threshold number of pixels indicates a maximum number of pixels within a block necessary to share a weight index between blocks.