公开(公告)号：US11206430B2

公开(公告)日：2021-12-21

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：US11140410B2

公开(公告)日：2021-10-05

申请号：US17124041

申请日：2020-12-16

Applicant: LG ELECTRONICS INC

Inventor： Jaeho Lee ,  Junghak Nam

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

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：US11134247B2

公开(公告)日：2021-09-28

申请号：US16341002

申请日：2017-09-29

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Junghak Nam

IPC: H04N19/117 ,  H04N19/182 ,  H04N19/70

Abstract: Disclosed in the present invention are an image processing method and an apparatus therefor. Specifically, the image processing method can comprise the steps of: extracting encoded image data from a bitstream received from an encoder; decoding the encoded image data so as to generate a reconstructed image; determining a category of a current pixel by comparing a pixel value of the current pixel in the reconstructed image with pixel values of neighboring pixels of the current pixel; generating an offset applied to the current pixel on the basis of a difference value between pixel values of pixels, determined according to the category, among the neighboring pixels and the pixel value of the current pixel; and compensating for the current pixel by adding the offset to the pixel value of the current pixel.

公开(公告)号：US11089312B2

公开(公告)日：2021-08-10

申请号：US16323488

申请日：2017-08-08

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Junghak Nam

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

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：US10939099B2

公开(公告)日：2021-03-02

申请号：US16095590

申请日：2016-04-22

Applicant: LG Electronics Inc.

Inventor： Naeri Park ,  Jaehyun Lim ,  Junghak Nam

IPC: H04N19/109 ,  H04N19/119 ,  H04N19/105 ,  H04N19/70 ,  H04N19/157 ,  H04N19/513 ,  H04N19/176 ,  H04N19/577

Abstract: The present invention discloses an inter prediction mode-based image processing method and an apparatus therefore. Specifically, a method for processing an image based on an inter prediction may include: deriving motion information of a first prediction unit determined by a first partitioning mode of a current block and motion information of a second prediction unit determined by a second partitioning mode of the current block; generating a prediction block of the first prediction unit by using the motion information of the first prediction unit and generating a prediction block of the second prediction unit by using the motion information of the second prediction unit; and generating a prediction block of the current block in units of sub-prediction unit determined by combining the first prediction unit and the second prediction unit by using the first prediction block and the second prediction block.

公开(公告)号：US10904561B2

公开(公告)日：2021-01-26

申请号：US16836248

申请日：2020-03-31

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/52 ,  H04N19/19 ,  H04N19/176 ,  H04N19/119

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：US10750170B2

公开(公告)日：2020-08-18

申请号：US15737607

申请日：2016-02-02

Applicant: LG Electronics Inc.

Inventor： Chulkeun Kim ,  Junghak Nam

IPC: H04N19/117 ,  H04N19/105 ,  H04N19/13 ,  H04N19/82 ,  H04N19/85 ,  H04N19/174 ,  H04N19/176 ,  H04N19/172 ,  H04N19/124 ,  H04N19/513

Abstract: A picture filtering method performed by an encoding device, according to the present invention, comprises the steps of: deriving, from a current picture, regions for adaptive loop filtering (ALF); deciding ALF coefficients by picture unit or region unit; on the basis of the ALF coefficients, determining, by region unit, whether ALF is usable; re-deciding ALF coefficients for an ALF-usable first region; deriving a filter shape for the first region; on the basis of the re-decided ALF coefficients, determining, by unit of coding units (CUs) in the first region, whether ALF is usable; performing filtering for ALF-usable CUs on the basis of the derived filter shape and the re-decided ALF coefficients; and transmitting at least one among information on the ALF-usable first region and information on the ALF-usable CUs. According to the present invention, efficient filtering appropriate for image properties per region may be applied.

公开(公告)号：US10602140B2

公开(公告)日：2020-03-24

申请号：US15736144

申请日：2016-02-02

Applicant: LG Electronics Inc.

Inventor： Chulkeun Kim ,  Junghak Nam

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/85 ,  H04N19/182 ,  H04N19/176

Abstract: A method for filtering a reconstructed picture performed by an encoding device, according to the present invention, comprises the steps of: deriving first filter information for a target region of a reconstructed picture; selecting one among the derived first filter information and a second filter information included in the filter bank; and performing filtering on the target region in the reconstructed picture on the basis of the selected filter information, wherein, if the first filter information is selected, the filter bank is updated, and if the second filter information is selected, a filter index may be transmitted to a decoder. According to the present invention, the filtering of a reconstructed picture on the basis of the filter bank may be efficiently performed, and the amount of data allocated to the transmission/reception of filter information is reduced therethrough, consequently enabling the increase of compression and coding efficiency.

公开(公告)号：US10531084B2

公开(公告)日：2020-01-07

申请号：US15736415

申请日：2016-06-14

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi Yoo ,  Jin Heo ,  Yongjoon Jeon ,  Eunyong Son ,  Junghak Nam

IPC: H04N11/02 ,  H04N19/105 ,  H04N19/176 ,  H04N19/107 ,  H04N19/159 ,  H04N19/593 ,  H04N19/11

Abstract: Disclosed are an intra prediction mode based image processing method, and an apparatus therefor. In particular, a method for processing an image on the basis of an intra prediction mode comprises the steps of: inputting, in most probable mode (MPM) candidates, intra prediction modes of a plurality of neighboring blocks which neighbor a current block, and then deriving the MPM candidates by inputting, in the MPM candidates, intra prediction modes within substitute modes consisting of a plurality of intra prediction modes, to which priorities are given, according to the priorities until the total number of MPM candidates is satisfied; deriving, from the MPM candidates, an intra prediction mode applied to the current block using an MPM index indicating a specific intra prediction mode; and generating a prediction block of the current block by applying the derived intra prediction mode.

公开(公告)号：US20180288443A1

公开(公告)日：2018-10-04

申请号：US15764723

申请日：2016-09-09

Applicant: LG ELECTRONICS INC.

Inventor： Jaehyun Lim ,  Naeri Park ,  Jungdong Seo ,  Junghak Nam

IPC: H04N19/82 ,  H04N19/50 ,  H04N19/176

Abstract: An inter-prediction method performed by a decoding apparatus according to the present invention comprises the steps of: obtaining prediction related information from a bitstream; generating prediction samples by performing inter-prediction on a current block on the basis of the prediction related information; determining whether or not a Wiener filter is available for the current block; if the Wiener filter is available, generating a Wiener filter candidate list on the basis of neighboring blocks of the current block and deriving Wiener filter coefficients for the current block on the basis of a candidate block within the Wiener filter candidate list; and filtering the prediction samples on the basis of the derived Wiener filter coefficients. According to the present invention, an inter-prediction efficiency can be improved and coding efficiency can be improved.