公开(公告)号：US20200260101A1

公开(公告)日：2020-08-13

申请号：US16863871

申请日：2020-04-30

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Jaehyun LIM ,  Junghak NAM

IPC: H04N19/513 ,  H04N19/103 ,  H04N19/44 ,  H04N21/235 ,  H04N19/537 ,  H04N19/119 ,  H04N19/176

Abstract: A video decoding method performed by a decoding apparatus comprises deriving control points (CPs) for the current block; obtaining motion vectors for the CPs; deriving a motion vector of a sub-block or a sample unit in the current block on the basis of the obtained motion vectors; deriving a prediction sample for the current block on the basis of the derived motion vector; and generating a reconstruction sample on the basis of the prediction sample. The method enables effective performance of inter prediction through the motion vectors (transformation prediction), not only when an image in the current block is moved in a plane, but also when the image in the current block is rotated, zoomed in, zoomed out, or transformed into a parallelogram. Accordingly, the amount of data for the residual signal for the current block can be eliminated or reduced, and the overall coding efficiency can be improved.

公开(公告)号：US20200236391A1

公开(公告)日：2020-07-23

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 ,  H04N19/119 ,  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：US20200186821A1

公开(公告)日：2020-06-11

申请号：US16793789

申请日：2020-02-18

Applicant: LG ELECTRONICS INC.

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

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

Abstract: According to an embodiment disclosed in the present document, it is possible to derive a history-based motion vector prediction (HMVP) buffer for a current block based on a history, and to derive motion information of the current block based on an HMVP candidate included in the HMVP buffer, thereby increasing inter prediction efficiency.

公开(公告)号：US20200036985A1

公开(公告)日：2020-01-30

申请号：US16337266

申请日：2017-09-28

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/176 ,  H04N19/11 ,  H04N19/186 ,  H04N19/593 ,  H04N19/105

Abstract: An intra prediction method includes: deriving a partitioning structure of a luma block; deriving intra chroma prediction mode information for deriving an intra prediction mode of a chroma block corresponding to the luma block; when the intra chroma prediction mode information indicates a derived mode (DM) or a linear mode (LM), partitioning the chroma block on the basis of the partitioning structure of the luma block so as to derive a plurality of chroma sub-blocks; and generating prediction samples for the plurality of chroma sub-blocks. The method performs illumination compensation-based inter prediction and reduces a boundary error of a block while reducing the amount of data in additional information. The method performs partitioning and intra prediction for a chroma block on the basis of a partitioning structure of a luma block.

公开(公告)号：US20190215531A1

公开(公告)日：2019-07-11

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

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.

公开(公告)号：US20190200016A1

公开(公告)日：2019-06-27

申请号：US16327192

申请日：2017-08-21

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/86 ,  H04N19/14

CPC classification number: H04N19/117 ,  H04N19/119 ,  H04N19/14 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/86

Abstract: The present invention discloses an image coding/decoding method and an apparatus for the method. More specifically, a method for filtering an image by a decoding apparatus comprises deriving boundaries of a block divided into quad-tree plus binary-tree structure; determining an edge among boundaries of the block to which de-blocking filtering is applied; determining a type of de-blocking filtering to be applied to the edge; and performing de-blocking filtering to a picture sample restored according to the de-blocking filtering type, wherein the edge or the type of de-blocking filtering is determined by considering width or height of the block.

公开(公告)号：US20190110061A1

公开(公告)日：2019-04-11

申请号：US16087963

申请日：2016-03-24

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Jaehyun LIM ,  Junghak NAM

IPC: H04N19/513 ,  H04N19/44 ,  H04N19/103 ,  H04N19/176 ,  H04N19/119

Abstract: A video decoding method performed by a decoding apparatus comprises: deriving control points (CPs) for the current block; obtaining motion vectors for the CPs; deriving a motion vector of a sub-block or a sample unit in the current block on the basis of the obtained motion vectors; deriving a prediction sample for the current block on the basis of the derived motion vector; and generating a reconstruction sample on the basis of the prediction sample. The method enables effective performance of inter prediction through the motion vectors (transformation prediction), not only when an image in the current block is moved in a plane, but also when the image in the current block is rotated, zoomed in, zoomed out, or transformed into a parallelogram. Accordingly, the amount of data for the residual signal for the current block can be eliminated or reduced, and the overall coding efficiency can be improved.

公开(公告)号：US20180316922A1

公开(公告)日：2018-11-01

申请号：US15773374

申请日：2016-11-04

Applicant: LG ELECTRONICS INC.

Inventor： Junghak NAM ,  Chulkeun KIM

IPC: H04N19/14 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/14 ,  H04N19/103 ,  H04N19/117 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86

Abstract: An image decoding method performed by a decoding apparatus, according to the present invention, comprises the steps of: acquiring information on a first SAO and information on a second SAO of a current block through a bit stream; generating a reconstructed block of the current block; and performing an SAO procedure for the reconstructed block on the basis of the first SAO and the second SAO, wherein the information on the first SAO comprises first offset type information applied to the first SAO and first offset value information for n offset values, and the information on the second SAO comprises second offset type information applied to the second SAO and second offset value information for m offset values. According to the present invention, an efficient SAO procedure can be performed on the basis of a plurality of SAOs, and the video quality of images can be further improved.

公开(公告)号：US20180310000A1

公开(公告)日：2018-10-25

申请号：US15762958

申请日：2016-09-23

Applicant: LG Electronics Inc.

Inventor： Jin HEO ,  Eunyong SON ,  Junghak NAM ,  Seungwook PARK ,  Sehoon YEA

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/11 ,  H04N19/593

CPC classification number: H04N19/159 ,  H04N19/11 ,  H04N19/146 ,  H04N19/176 ,  H04N19/46 ,  H04N19/593 ,  H04N19/61

Abstract: An image decoding method, which is performed by a decoding apparatus, includes the steps of: deriving a frequency domain-neighboring block for a neighboring block of a current block in a spatial domain; deriving a frequency domain-prediction block for the current block by applying a prediction pattern to the frequency domain-neighboring block; generating a frequency domain-reconstructed block for the current block on the basis of the frequency domain-prediction block; and generating a reconstructed block for the current block in the spatial domain on the basis of the frequency inverse transform of the frequency domain-reconstructed block. The present invention can generate a prediction block for a current block in a frequency domain, and accordingly can more efficiently reconstruct a complex image.

公开(公告)号：US20180295363A1

公开(公告)日：2018-10-11

申请号：US15766278

申请日：2016-10-13

Applicant: LG ELECTRONICS INC.

Inventor： Junghak NAM ,  Chulkeun KIM ,  Sehoon YEA

IPC: H04N19/117 ,  H04N19/174 ,  H04N19/44 ,  H04N19/46 ,  H04N19/625 ,  H04N19/85 ,  H04N19/139 ,  H04N19/80

Abstract: An image decoding method performed by a decoding apparatus according to the present invention comprises the steps of: generating a reconstruction area for a target area within a current picture; deriving a predetermined plurality of basic filters for the target area; updating at least one basic filter among the plurality of basic filters; receiving weight information for each of the basic filters; determining a merge filter for the target area on the basis of the basic filters and the weight information; and generating a modified reconstruction area by performing filtering on the target area on the basis of the filter coefficient of the determined merge filter. The present invention allows updating with filter information suitable for improving the visual quality of the target area and can thereby improve the accuracy of filtering and overall coding efficiency.