Method for processing immersive video and method for producing immersive video

1. A method of producing an immersive video, the method comprising:

decoding an atlas;

determining whether the atlas is constructed by packing a plurality of sub-atlases; and

producing a viewport image using the atlas,

wherein, in response to the atlas constructed by packing the plurality of sub-atlases, packing information of the atlas is decoded from a bitstream,

wherein the packing information comprises position information of each of the plurality of sub-atlases,

wherein a flag, indicating whether a specific view is capable of being completely produced by the atlas, is decoded from the bitstream, and

wherein, according to a value of the flag, it is determined whether an additional atlas is used in addition to the atlas to produce the viewport image.

2. The method of claim 1 , further comprising decoding first mapping information between a spatial region and a view image,

wherein the first mapping information comprises identifier information of a spatial region and identifier information of a group corresponding to the spatial region, the group consisting of at least one view.

3. The method of claim 2 , further comprising decoding second mapping information between an atlas and the group,

wherein the second mapping information comprises identification information of a tile in the atlas corresponding to the group.

4. The method of claim 1 , further comprising decoding quality information of a view image,

wherein the quality information is a 1-bit flag indicating high quality or low quality.

5. The method of claim 4 ,

wherein the quality information is decoded for each of a texture component and a depth component of the view image.

6. The method of claim 1 , further comprising decoding frame order information of atlases,

wherein the frame order information comprises information on the number of atlases in an access unit and order information of the atlases.

7. The method of claim 1 , further comprising decoding pruning graph information of a view image,

wherein the pruning graph information comprises at least one of a flag indicating whether the view image is a root node or parent node information of the view image.

8. The method of claim 7 , further comprising decoding a flag indicating whether to update previously decoded pruning graph information for the view image.

9. The method of claim 8 , further comprising encoding first mapping information between a spatial region and a view image,

wherein the first mapping information comprises identifier information of a spatial region and identifier information of a group corresponding to the spatial region.

10. The method of claim 9 , further comprising encoding second mapping information between an atlas and the group,

wherein the second mapping information comprises identification information of a tile in the atlas corresponding to the group.

11. A method of processing an immersive video, the method comprising:

grouping view images;

generating an atlas for each group; and

determining whether a plurality of atlases is repacked into one atlas,

wherein, in response to the repacking being performed, packing information of the repacked atlas is additionally encoded,

wherein the method further comprises encoding a flag indicating whether a view image is capable of being completely reproduced by the repacked atlas.

12. The method of claim 11 , further comprising encoding quality information of a view image,

wherein the quality information is a 1-bit flag indicating high quality or low quality.

13. The method of claim 12 , further comprising encoding a flag indicating whether to update previously decoded pruning graph information for the view image.

14. The method of claim 11 , further comprising encoding frame order information of atlases,

wherein the frame order information comprises information on the number of atlases in an access unit and order information of the atlases.