Video encoding method and decoding method using tiles and slices, and video encoding device and decoding device using tiles and slices

A video encoding method comprising:

• when tiles included in a first slice are discontinuously located within a picture, sequentially encoding the tiles included in the first slice;
• encoding information about an index of a first tile located at an upper left end from among the tiles included in the first slice;
• and
• encoding information about an index of a last tile located at a lower right end from among the tiles included in the first slice,
• wherein the information about the index of the first tile and a number of tile columns included in the picture are used to obtain a column index of the first tile,
• the information about the index of the last tile and the number of the tile columns included in the picture are used to obtain a column index of the last tile,
• an index difference between the first tile and the last tile is obtained based on whether the index of the first tile is greater than the index of the last tile and whether the column index of the first tile is greater than the column index of the last tile,
• a number of tiles included in the first slice is obtained using the index difference between the first tile and the last tile and a number of the tile columns included in the picture.