Method for encoding/decoding image signal and device therefor
An image decoding method according to the present disclosure comprises the steps of: determining whether a picture is to be divided into multiple sub-pictures; when it is determined that the picture is to be divided into multiple sub-pictures, dividing the picture into multiple sub-pictures; and determining whether the multiple sub-pictures are independent of each other.
1. A system comprising:
one or more processors; and
one or more non-transitory computer readable media storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
determining whether a picture is encoded according to a plurality of sub-pictures;
partitioning the picture into the plurality of sub-pictures when it is determined that the picture is encoded according to the plurality of sub-pictures; and
determining whether the plurality of sub-pictures have independence,
wherein the determination on whether to pictures have independence is based on a first flag representing whether all of the plurality of sub-pictures have independence,
wherein a first value for the first flag indicates that all of the plurality of sub-pictures have independence, and
wherein a second value for the first flag indicates that at least one of the plurality of sub-pictures does not have independence.
2. The system of claim 1 , wherein when the first flag represents that at least one of the plurality of sub-pictures does not have independence, a second flag representing whether each sub-picture has independence is parsed for each of the plurality of sub-pictures.
3. The system of claim 1 , wherein partitioning the picture includes determining a number of the sub-pictures included by the picture and determining position information and size information of each of the sub-pictures.
4. The system of claim 3 , wherein signaling of the position information is omitted for a first one among the sub-pictures.
5. The system of claim 3 , wherein signaling of the size information is omitted for a last one among the sub-pictures.
6. The system of claim 3 , wherein the size information includes width information representing a number of coding tree units for a horizontal direction in the sub-picture and height information representing the number of coding tree units for a vertical direction in the sub-picture.
7. One or more non-transitory computer readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:
determining whether a picture is encoded according to a plurality of sub-pictures;
partitioning the picture into the plurality of sub-pictures when it is determined that the picture is encoded according to the plurality of sub-pictures; and
determining whether the plurality of sub-pictures have independence,
wherein the determination on whether to pictures have independence is based on a first flag representing whether all of the plurality of sub-pictures have independence,
wherein a first value for the first flag indicates that all of the plurality of sub-pictures have independence, and
wherein a second value for the first flag indicates that at least one of the plurality of sub-pictures does not have independence.
8. The one or more non-transitory computer readable media of claim 7 , wherein when the first flag represents that at least one of the plurality of sub-pictures does not have independence, a second flag representing whether each sub-picture has independence is parsed for each of the plurality of sub-pictures.
9. The one or more non-transitory computer readable media of claim 7 , wherein partitioning the picture includes determining a number of the sub-pictures included by the picture and determining position information and size information of each of the sub-pictures.
10. The one or more non-transitory computer readable media of claim 9 , wherein signaling of the position information is omitted for a first one among the sub-pictures.
11. The one or more non-transitory computer readable media of claim 9 , wherein signaling of the size information is omitted for a last one among the sub-pictures.
12. The one or more non-transitory computer readable media of claim 9 , wherein the size information includes width information representing a number of coding tree units for a horizontal direction in the sub-picture and height information representing the number of coding tree units for a vertical direction in the sub-picture.
13. A system comprising:
one or more processors; and
one or more non-transitory computer readable media storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
determining whether a picture is to be encoded according to a plurality of sub-pictures;
partitioning the picture into the plurality of sub-pictures when it is determined that the picture is to be encoded according to the plurality of sub-pictures; and
determining whether the plurality of sub-pictures have independence,
wherein a first flag representing whether all of the plurality of sub-pictures have independence is encoded in a bitstream,
wherein a first value for the first flag indicates that all of the plurality of sub-pictures have independence, and
wherein a second value for the first flag indicates that at least one of the plurality of sub-pictures does not have independence.
14. The system of claim 13 , wherein when the first flag represents that at least one of the plurality of sub-pictures does not have independence, a second flag representing whether each sub-picture has independence is encoded for each of the plurality of sub-pictures.
15. The system of claim 13 , wherein the operations further include encoding partitioning information of the picture, and
wherein the partitioning information includes position information and size information of each of the sub-pictures.
16. The system of claim 15 , wherein encoding of the position information is omitted for a first one among the sub-pictures.
17. The system of claim 15 , wherein encoding of the size information is omitted for a last one among the sub-pictures.
18. The system of claim 15 , wherein the size information includes width information representing a number of coding tree units for a horizontal direction in the sub-picture and height information representing the number of coding tree units for a vertical direction in the sub-picture.
19. One or more non-transitory computer readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:
determining whether a picture is to be encoded according to a plurality of sub-pictures;
partitioning the picture into the plurality of sub-pictures when it is determined that the picture is to be encoded according to the plurality of sub-pictures; and
determining whether the plurality of sub-pictures have independence,
wherein a first flag representing whether all of the plurality of sub-pictures have independence is encoded in a bitstream,
wherein a first value for the first flag indicates that all of the plurality of sub-pictures have independence, and
wherein a second value for the first flag indicates that at least one of the plurality of sub-pictures does not have independence.
20. The one or more non-transitory computer readable media of claim 19 , wherein when the first flag represents that at least one of the plurality of sub-pictures does not have independence, a second flag representing whether each sub-picture has independence is encoded for each of the plurality of sub-pictures.
21. The one or more non-transitory computer readable media of claim 19 , wherein the operations further include encoding partitioning information of the picture, and
wherein the partitioning information includes position information and size information of each of the sub-pictures.
22. The one or more non-transitory computer readable media of claim 21 , wherein encoding of the position information is omitted for a first one among the sub-pictures.
23. The one or more non-transitory computer readable media of claim 21 , wherein encoding of the size information is omitted for a last one among the sub-pictures.
24. The one or more non-transitory computer readable media of claim 21 , wherein the size information includes width information representing a number of coding tree units for a horizontal direction in the sub-picture and height information representing the number of coding tree units for a vertical direction in the sub-picture.