Method for splitting picture and decoding apparatus

1. A video decoding method for partitioning a picture, the method comprising:

decoding, from a bitstream, a split flag indicating whether the picture is partitioned into one or more sub-units;

decoding, from the bitstream, a type flag indicating a slice type when the split flag indicates partitioning; and

decoding, from the bitstream, partition information related to partitioning of the picture into a plurality of slices when the split flag indicates partitioning and the type flag indicates a rectangular slice,

wherein the partition information includes information on the number of slices and size information of the slices,

wherein the size information of the slices includes information on the number of columns of tiles included in a slice and information on the number of rows of tiles included in the slice.

2. The method of claim 1 ,

wherein the partition information includes information on the number of tiles and size information of the tiles when the split flag indicates partitioning.

3. The method of claim 1 , further comprising:

decoding, from the bitstream, mapping information for mapping one or more sub-pictures to one or more slices belonging to each of the sub-pictures; and

mapping the sub-pictures to the slices based on the mapping information.

4. The method of claim 3 , further comprising decoding, from the bitstream, a mapping flag indicating whether mapping is applied to the picture,

wherein, when the mapping flag indicates that mapping is applied, the mapping information includes first mapping information decoded from SPS or PPS of the bitstream.

5. The method of claim 3 , wherein, when the split flag indicates partitioning, the mapping information includes second mapping information decoded from a slice header of the bitstream.

6. The method of claim 1 , further comprising:

decoding address information of a target slice from a slice header of the bitstream; and

setting, based on the address information, an index of the target slice within a sub-picture in which the target slice is included,

wherein the address information indicates an index of the slice within the picture when the type flag decoded from the bitstream indicates the rectangular slice, and

the address information indicates an index of a tile included in the picture when the type flag indicates a raster-scan slice.

7. A video encoding method, the method comprising:

encoding a split flag indicating whether a picture is partitioned into one or more sub-units;

encoding a type flag indicating a slice type when the split flag indicates partitioning; and

encoding partition information related to partitioning of the picture into a plurality of slices when the split flag indicates partitioning and when the type flag indicates a rectangular slice,

wherein the partition information includes information on the number of slices and size information of the slices,

wherein the size information of the slices includes information on the number of columns of tiles included in a slice and information on the number of rows of tiles included in the slice.

8. A method for transmitting a bitstream containing encoded video data, the method comprising:

generating the bitstream by encoding video data; and

transmitting the bitstream to a video decoding apparatus,

wherein generating the bitstream comprises:

encoding a split flag indicating whether a picture is partitioned into one or more sub-units;

encoding a type flag indicating a slice type when the split flag indicates partitioning; and

encoding partition information related to partitioning of the picture into a plurality of slices when the split flag indicates partitioning and the type flag indicates a rectangular slice,

wherein the partition information includes information on the number of slices and size information of the slices,

wherein the size information of the slices includes information on the number of columns of tiles included in a slice and information on the number of rows of tiles included in the slice.