CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 U.S.C. section 371, of PCT International Application No.: PCT/KR2020/007985, filed on Jun. 19, 2020, which claims foreign priority to Korean Patent Application No.: 10-2019-0074659, filed on Jun. 22, 2019 and Korean Patent Application No.: 10-2019-0129991, filed on Oct. 18, 2019, in the Korean Intellectual Property Office, the disclosures of which are hereby incorporated by reference in their entireties.

FIELD OF THE DISCLOSURE

The present disclosure relates to a video signal encoding/decoding method and a device therefor.

DESCRIPTION OF THE RELATED ART

As display panels become larger, video service of higher quality is required. The biggest problem with high-definition video service is that an amount of data is greatly increased. In order to solve the above problem, research for improving the video compression rate is being actively conducted. As a representative example, the Joint Collaborative Team on Video Coding (JCT-VC) was formed in 2009 by the Motion Picture Experts Group (MPEG) and the Video Coding Experts Group (VCEG) under the International Telecommunication Union-Telecommunication (ITU-T). The JCT-VC proposed High Efficiency Video Coding (HEVC), a video compression standard that has about twice compression performance of H.264/AVC, and that was approved as standard on Jan. 25, 2013. However, with rapid development of high-definition video services, the performance of HEVC is gradually showing its limitations.

DISCLOSURE

Technical Purpose

A purpose of the present disclosure is to provide a method for partitioning a picture into a plurality of tiles or a plurality of slices in encoding/decoding a video signal, and a device for performing the method.

A purpose of the present disclosure is to provide a method for partitioning a slice based on a tile index in partitioning a picture into a plurality of tiles, and a device for performing the method.

A purpose of the present disclosure is to provide a method for partitioning a slice based on difference information with a previous slice in partitioning a picture into a plurality of slices, and a device for performing the method.

Technical purposes obtainable from the present disclosure are non-limited to the above-mentioned technical purposes, and other unmentioned technical purposes may be clearly understood from the following description by those having ordinary skill in the technical field to which the present disclosure pertains.

Technical Solution

A video signal decoding method according to the present disclosure may include partitioning a current picture into a plurality of tiles, decoding partitioning information representing a slice type, wherein the partitioning information represents whether a rectangular slice is applied or not, and determining a slice based on tile index difference information when the partitioning information represents that the rectangular slice is applied. In this case, the tile index difference information may represent an index difference between a top-left tile included by the slice and a top-left tile of a subsequent slice.

A video signal encoding method according to the present disclosure may include partitioning a current picture into a plurality of tiles, determining whether a rectangular slice is applied, partitioning the current picture into a plurality of rectangular slices when the rectangular slice is applied or not and encoding tile index difference information for at least one of the plurality of slices. In this case, the tile index difference information may represent an index difference between a top-left tile included by a slice and a top-left tile of a subsequent slice.

In a video signal decoding method according to the present disclosure, the method may further include decoding a difference information present flag representing whether the tile index difference information is present. In this case, whether the difference information present flag is to be decoded or not may be determined based on whether the number of slices included in the current picture is equal to or greater than a threshold value.

In a video signal decoding method according to the present disclosure, when the number of slices included in the current picture is equal to or less than a threshold value, decoding of the difference information present flag may be omitted and a value of the difference information present flag may be inferred to 0.

In a video signal decoding method according to the present disclosure, the method may further comprise decoding information representing a size of the slice. The information representing a size of the slice may include width information representing a width of a slice and height information representing a height of a slice and whether height information is decoded for the slice may be determined based on whether the slice is adjacent to a left boundary of the current picture.

In a video signal decoding method according to the present disclosure, when the slice is not adjacent to a left boundary of the current picture, decoding of the height information may be omitted and a height of the slice may be set the same as a height of other slice adjacent to a left boundary of the current picture.

In a video signal decoding method according to the present disclosure, partitioning the current picture into the plurality of tiles may comprise decoding width information representing a width of at least one of a plurality of tile columns included by the current picture and partitioning the current picture into the plurality of tile columns based on the width information. In this case, when decoding of the width information is omitted for a first tile column among the plurality of tile columns, a width of the first tile column may be determined based on width information of a second tile column which is decoded last.

It is to be understood that the foregoing summarized features are exemplary aspects of the following detailed description of the present disclosure without limiting the scope of the present disclosure.

Technical Effect

According to the present disclosure, encoding/decoding efficiency may be improved by partitioning a picture into a plurality of tiles or slices.

According to the present disclosure, encoding/decoding efficiency may be improved by partitioning a slice based on a tile index.

According to the present disclosure, encoding/decoding efficiency may be improved by partitioning a slice based on difference information with a previous slice.

Effects obtainable from the present disclosure may be non-limited by the above-mentioned effect, and other unmentioned effects may be clearly understood from the following description by those having ordinary skill in the technical field to which the present disclosure pertains.

