Search

US-20260129197-A1 - METHOD FOR ENCODING/DECODING IMAGE SIGNAL, AND DEVICE FOR THE SAME

US20260129197A1US 20260129197 A1US20260129197 A1US 20260129197A1US-20260129197-A1

Abstract

A video signal decoding method according to the present disclosure includes 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, decoding width information and height information for a first slice, decoding tile index difference value information for the first slice and determining an index of a top-left tile of a second slice based on the difference value information.

Inventors

  • Bae Keun Lee

Assignees

  • KONINKLIJKE PHILIPS N.V.

Dates

Publication Date
20260507
Application Date
20251219
Priority Date
20191120

Claims (7)

  1. 1 . A method of decoding a video, the method comprising: partitioning a current picture into a plurality of tile columns; partitioning the current picture into a plurality of tile rows; determining whether a rectangular slice mode is applied to the current picture or not; and when the rectangular slice mode is applied to the current picture, determining slices, including a first slice and a second slice, wherein the first slice and the second slice have a rectangular shape, wherein an index assigned to the second slice has a value equal to an index assigned to the first slice plus one, wherein determining the slices in the current picture comprises: decoding slice number information indicating a number of slices in the current picture; and decoding tile index difference value information specifying a difference between an index of a top-left tile of the first slice and an index of a top-left tile of the second slice, wherein the index of the top-left tile of the second slice is determined by adding the difference specified by the tile index difference value information to the index of the top-left tile of the first slice, and wherein whether to decode width information for the second slice from a bitstream or not is determined based on whether the top-left tile of the second slice is included in a rightmost tile column in the current picture.
  2. 2 . The method of claim 1 , wherein the width information indicates a value which is equal to a number of tile columns included in the second slice minus one, and wherein when the top-left tile of the second slice is included in the rightmost tile column in the current picture, decoding of the width information for the second slice is not performed but instead a value of the width information is inferred to 0.
  3. 3 . A method of encoding a video, the method comprising: partitioning a current picture into a plurality of tiles columns; partitioning the current picture into a plurality of tile rows; encoding in a bitstream information indicating whether a rectangular slice mode is used to partition the current picture; and when the rectangular slice mode is used, determining slices, including a rectangular first slice and a rectangular second slice, wherein an index assigned to the second slice has a value equal to an index assigned to the first slice plus one, wherein determining the slices in the current picture comprises: encoding slice number information indicating a number of slices in the current picture; and encoding tile index difference value information specifying a difference between an index of a top-left tile of a first slice and an index of a top-left tile of a second slice, wherein the tile index difference value information has a value calculated by subtracting the index of the top-left tile of the second slice from the index of the top-left tile of the first slice, and wherein whether to encode width information for the second slice into a bitstream is determined based on whether the top-left tile of the second slice is included in a rightmost tile column in the current picture.
  4. 4 . The method of claim 3 , wherein the width information indicates a value which is equal to a number of tile columns included in the second slice minus 1, and wherein when the top-left tile of the second slice is included in the rightmost tile column in the current picture, encoding of the width information for the second slice is omitted.
  5. 5 . A non-transitory computer-readable medium comprising a bitstream, wherein the bitstream is encoded by the encoding method of claim 3 .
  6. 6 . A method of transmitting a bitstream over a communication network, comprising: encoding the bitstream by the encoding method of claim 3 , and transmitting the bitstream over the network.
  7. 7 . A non-transitory computer-readable medium bitstream, wherein the bitstream comprises: comprising a information indicating whether a rectangular slice mode is used to partition the current picture; slice number information indicating a number of slices in the current picture; and tile index difference value information specifying a difference between an index of a top-left tile of a first slice and an index of a top-left tile of a second slice, wherein the tile index difference value information has a value calculated by subtracting the index of the top-left tile of the second slice from the index of the top-left tile of the first slice, and width information of any slice fulfilling a criterion that the top-left tile is not included in a rightmost tile column in the current picture.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of U.S. patent application Ser. No. 18/949,962 filed on Nov. 15, 2024 which is a continuation of Ser. No. 18/374,655, filed on Sep. 28, 2023, a continuation of U.S. patent application Ser. No. 17/902,790, filed on Sep. 2, 2022, a continuation of U.S. patent application Ser. No. 17/283,542, filed on Apr. 7, 2021, now U.S. Pat. No. 11, 470, 314 issued on Oct. 11, 2022, and a continuation of PCT International Application No. PCT/KR2020/016282, filed on Nov. 18, 2020, which claim foreign priority to Korean Patent Application No. 10-2019-0149657, filed on Nov. 20, 2019 and Korean Patent Application No. 10-2020-0044442, filed on Apr. 13, 2020 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 includes 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, decoding width information and height information for a first slice, decoding tile index difference value information for the first slice and determining an index of a top-left tile of a second slice based on the difference value information. In this case, whether width information for the second slice is decoded may be determined based on a position of a top-left tile of the second slice. A video signal encoding method according to the present disclosure includes partitioning a current picture into a plurality of tiles, determining whether a rectangular slice is applied, determining a size of a first slice and a second slice, encoding width information and size information for the first slice and encoding tile index difference value information for the first slice. In this case, whether width information for the second slice will be encoded may be determined based on a position of a top-left tile of the second slice. In a video signal decoding method according to the present disclosure, when the top-left tile of the second slice is included in the rightmost tile column in the current picture, decoding of width information for the second slice may be omitted and a value thereof may be inferred to 0. In a video signal decoding method according to the present disclosure, whether the top-left tile of the second slice belongs to the rightmost tile column may be determined based on a modular operation between an index of the top-left tile and the number of tile columns in a picture. In a video signal decoding method according to the present disclosure, whether height information for the second slice is decoded may be determined based on a position of a top-left tile of the second slice. In a video signal decoding method according to the present disclosure, when the top-left tile of the second slice is included in the lowest tile row in the current picture, decoding of height i