Method for splitting picture and decoding apparatus

1 . A video decoding method, the method comprising:

decoding, from a bitstream, a split flag indicating whether a 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;

decoding, from the bitstream, 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; and

decoding the slices partitioned from the picture based on the partition information,

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

wherein, when a slice is split into a number of tiles, the size information of the slices includes information on a number of columns of tiles included in the slice and information on a number of rows of tiles included in the slice.

2 . The method of claim 1 ,

wherein the partition information includes information on a number of tiles and size information of 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;

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; and

encoding the slices partitioned from the picture,

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

wherein, when a slice is split into a number of tiles, the size information of the slices includes information on a number of columns of tiles included in the slice and information on a 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;

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; and

encoding the slices partitioned from the picture,

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

wherein, when a slice is split into a number of tiles, the size information of the slices includes information on a number of columns of tiles included in the slice and information on a number of rows of tiles included in the slice.