Video signal processing method and device

Patent metadata

Field	Value
Publication number	US-2020322601-A1
Application number	US-202016907081-A
Country	US
Kind code	A1
Filing date	Jun 19, 2020
Priority date	Dec 22, 2017
Publication date	Oct 8, 2020
Grant date	—

Abstract

Disclosed is a video signal processing method and device for encoding or decoding a video signal. More specifically, disclosed are a video signal processing method and a video signal processing device for performing the method, the method comprising: obtaining reference line information indicating a reference line for intra prediction of a current block among a plurality of reference lines comprising neighboring samples of the current block; determining, on the basis of the reference line information, an intra prediction mode for the current block among a plurality of intra prediction modes constituting an intra prediction mode set; and decoding the current block on the basis of a plurality of reference samples on the reference line according to the reference line information and the determined intra prediction mode, wherein the plurality of reference lines include a first reference line comprising neighboring samples on a line adjacent to the boundary of the current block and a second reference line comprising neighboring samples on a line spaced a distance corresponding to a predetermined number of samples apart from the boundary of the current block.

First claim

What is claimed is:

1 . A method for processing a video signal comprising:
obtaining reference line information indicating a reference line used for intra prediction of a current block among a plurality of reference lines configured with neighboring samples of the current block; determining an intra prediction mode for the current block among a plurality of intra prediction modes configuring an intra prediction mode set based on the reference line information; and decoding the current block based on a plurality of reference samples on a reference line according to the reference line information and the determined intra prediction mode, wherein the plurality of reference lines comprise a first reference line configured with neighboring samples on a line adjacent to the boundary of the current block, and a second reference line configured with neighboring samples on a line spaced by a specific number of samples based on the boundary of the current block.

2 . The method of claim 1 , wherein when the reference line for intra prediction of the current block is the first reference line, the intra prediction mode set is a first intra prediction mode set,
wherein when the reference line for intra prediction of the current block is not the first reference line, the intra prediction mode set is a second intra prediction mode set configured with part of a plurality of intra prediction modes configuring the first intra prediction mode set.

3 . The method of claim 2 , wherein the second intra prediction mode set does not include a planar mode.

4 . The method of claim 3 , wherein the second intra prediction mode set is determined based on an intra prediction mode corresponding to any one of neighboring blocks of the current block,
wherein the second intra prediction mode set includes at least one of a direct current mode (DC mode) and/or a plurality number of angular modes, and wherein the plurality number of angular modes is a preset number of angular modes.

5 . The method of claim 4 , wherein the determining of the intra prediction mode for the current block comprises:
receiving intra prediction mode information indicating the DC mode or any one of the preset number of angular modes included in the second intra prediction mode set; and determining an intra prediction mode for the current block based on the intra prediction mode information.

6 . The method of claim 2 , wherein the intra prediction mode set is determined based on a relative position of the current block in an upper level region of the current block.

7 . The method of claim 6 , further comprising configuring the intra prediction mode set for the current block according to the relative position of the current block in the upper level region.

8 . The method of claim 7 , wherein when the current block is adjacent to an upper boundary of the upper level region, the reference line information is considered to indicate the first reference line,
wherein the intra prediction mode set for the current block is the first intra prediction mode set.

9 . The method of claim 3 , wherein the first intra prediction mode set comprises a plurality of angular modes, the planar mode, and a direct current mode (DC mode).

10 . The method of claim 1 , wherein the boundary of the current block is a left or upper boundary of the current block.

11 . The method of claim 1 , wherein the specific number of samples is less than or equal to a preset number of samples.

12 . The method of claim 11 , wherein the number of samples represents the number of integer pixels.

13 . A video signal processing device comprising a processor,
wherein the processor is configured to: obtain reference line information indicating a reference line used for intra prediction of a current block among a plurality of reference lines configured with neighboring samples of the current block, determine an intra prediction mode for the current block among a plurality of intra prediction modes configuring an intra prediction mode set based on the reference line information, and decode the current block based on a plurality of reference samples on a reference line according to the reference line information and the determined intra prediction mode, wherein the plurality of reference lines comprise a first reference line configured with neighboring samples on a line adjacent to the boundary of the current block, and a second reference line configured with neighboring samples on a line spaced by a specific number of samples based on the boundary of the current block.

14 . The device of claim 13 , wherein when the reference line for intra prediction of the current block is the first reference line, the intra prediction mode set is a first intra prediction mode set,
wherein when the reference line for intra prediction of the current block is not the first reference line, the intra prediction mode set is a second intra prediction mode set configured with part of a plurality of intra prediction modes configuring the first intra prediction mode set.

15 . The device of claim 14 , wherein the second intra prediction mode set does not include a planar mode.

16 . The device of claim 15 , wherein the second intra prediction mode set is determined based on an intra prediction mode corresponding to any one of neighboring blocks of the current block,
wherein the second intra prediction mode set includes at least one of a direct current mode (DC mode) and/or a plurality number or angular modes, and wherein the plurality number of angular modes is a preset number of angular modes.

17 . The device of claim 16 , wherein the processor configured to:
receive intra prediction mode information indicating the DC mode or any one of the preset number of angular modes included in the second intra prediction mode set, and determine an intra prediction mode for the current block based on the intra prediction mode information.

18 . The device of claim 14 , wherein the intra prediction mode set is determined based on a relative position of the current block in an upper level region of the current block.

19 . The device of claim 18 , wherein the processor is configured to:
configure the intra prediction mode set for the current block according to the relative position of the current block in the upper level region.

20 . The device of claim 19 , wherein when the current block is adjacent to an upper boundary of the upper level region, the reference line information is considered to indicate the first reference line,
wherein the intra prediction mode set for the current block is the first intra prediction mode set.

Assignees

• Wilus Inst Standards & Tech Inc
• Humax Co Ltd

Inventors

• Ko Geonjung
• Son Juhyung
• Kim Dongcheol
• Jung Jaehong
• Kwak Jinsam

Classifications

• H04N19/105 Primary

  Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction · CPC title

• H04N19/132

  Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking · CPC title

• H04N19/593

  involving spatial prediction techniques · CPC title

• H04N19/11 Primary

  among a plurality of spatial predictive coding modes · CPC title

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title