Method for encoding/decoding image signal, and device for same

1. A method of decoding a video, the method comprising:

partitioning a current picture into a plurality of tiles;

decoding partitioning information representing whether a rectangular slice type is applied or not; and

decoding 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 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. The method of claim 1 , wherein the width information indicates a value subtracting 1 from a number of tile columns included in the second slice, 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 omitted and a value of the width information is inferred to 0.

3. The method of claim 2 , wherein whether the top-left tile of the second slice is included in the rightmost tile column is determined based on a modular operation between the index of the top-left tile of the second slice and a number of tile columns in the current picture.

4. The method of claim 1 , wherein whether to decode height information for the second slice from the bitstream or not is determined based on whether the top-left tile of the second slice is included in a lowest tile row in the current picture.

5. The method of claim 4 , wherein the height information indicates a value subtracting 1 from a number of tile rows included in the second slice, and wherein when the top-left tile of the second slice is included in the lowest tile row in the current picture, decoding of the height information for the second slice is omitted and a value of the height information is inferred to 0.

6. The method of claim 5 , wherein whether the top-left tile of the second slice is included in the lowest tile row is determined based on a division operation between the index of the top-left tile of the second slice and a number of tile columns in the current picture.

7. The method of claim 1 , wherein the method further comprises: decoding a tile index difference value present flag representing whether the tile index difference value information is present in the bitstream, and

wherein whether to decode the tile index difference value present flag from the bitstream or not is determined based on a number of slices included in the current picture.

8. A method of encoding a video, the method comprising:

partitioning a current picture into a plurality of tiles;

determining whether a rectangular slice type is applied; 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 derived 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.

9. The method of claim 8 , wherein the width information indicates a value subtracting 1 from a number of tile columns included in the second slice, 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.

10. The method of claim 8 , wherein whether to encode height information for the second slice into the bitstream or not is determined based on whether the top-left tile of the second slice is included in a lowest tile row in the current picture.

11. The method of claim 10 , wherein the height information indicates a value subtracting 1 from a number of tile rows included in the second slice, and

wherein when the top-left tile of the second slice is included in the lowest tile row in the current picture, encoding of the height information for the second slice is omitted.

12. A non-transitory computer-readable medium for storing data associated with a video, comprising:

a data stream stored in the non-transitory computer-readable medium, the data stream comprising:

partitioning information representing whether a rectangular slice type is applied or not, 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 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 the compressed video data further comprises width information for the second slice 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.