Image signal encoding/decoding method and apparatus therefor
An image signal decoding method according to an embodiment of the present disclosure comprises the steps of: partitioning the current picture into a plurality of tiles; decoding partition information indicating a slice type, the partition information indicating whether a rectangular slice is to be applied; determining the number of slices in the current picture; and defining the slices using the tiles.
1. A method of decoding a video, the method comprising:
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;
determining a number of slices in the current picture; and
defining the slices by using the tiles,
wherein defining the slices is performed based on a difference information present flag representing whether tile index difference information is encoded, and
wherein whether the difference information present flag is parsed is determined based on the number of the slices included in the current picture.
2. The method of claim 1 , wherein the difference information present flag represents whether there is difference information representing an index difference value between a first tile included in a first slice and a second tile included in a second slice in a bitstream.
3. The method of claim 2 , wherein when the number of the slices is 2, parsing of the difference information present flag is omitted and a value thereof is inferred to 0.
4. The method of claim 3 , wherein when the number of the slices is 2, width information or height information is parsed for the first slice and the width information or the height information is not parsed for the second slice.
5. The method of claim 1 , wherein when the current picture includes two or more slices and a top-left tile in a slice is included in a rightmost tile column in the current picture, parsing of width information is omitted.
6. The method of claim 1 , wherein when the current picture includes two or more slices and a top-left tile in a slice is included in a lowest tile row in the current picture, parsing of height information is omitted.
7. A method of encoding a video, the method comprising:
partitioning a current picture into a plurality of tiles;
determining whether a rectangular slice is applied;
determining a number of slices in the current picture; and
defining the slices by using the tiles,
wherein defining the slices includes determining whether a difference information present flag representing whether tile index difference information is encoded will be encoded, and
wherein whether the difference information present flag will be encoded is determined based on the number of the slices included in the current picture.
8. The method of claim 7 , wherein the difference information present flag represents whether there is difference information representing an index difference value between a first tile included in a first slice and a second tile included in a second slice in a bitstream.
9. The method of claim 8 , wherein when the number of the slices is 2, encoding of the difference information present flag is omitted and encoding of the difference information is omitted.
10. The method of claim 9 , wherein when the number of the slices is 2, width information or height information is encoded for the first slice and the width information or the height information is not encoded for the second slice.
11. The method of claim 7 , wherein when the current picture includes two or more slices and a top-left tile in a slice is included in a rightmost tile column in the current picture, encoding of width information is omitted.
12. The method of claim 7 , wherein when the current picture includes two or more slices and a top-left tile in a slice is included in a lowest tile row in the current picture, encoding of height information is omitted.