Immersive video encoding method and immersive video decoding method
Disclosed herein are an immersive video encoding method and an immersive video decoding method. The immersive video encoding method includes setting basic view images among input images corresponding to multiple views, generating an atlas image using the basic view images, performing encoding on the atlas image, and generating metadata about an encoded atlas image, wherein the atlas image includes a texture atlas or a depth atlas.
1 . An immersive video encoding method, comprising:
setting basic view images among input images corresponding to multiple views;
generating an atlas image using the basic view images;
performing encoding on the atlas image; and
generating metadata about an encoded atlas image,
wherein the atlas image includes a texture atlas and a depth atlas,
the depth atlas is split into multiple main blocks,
the metadata includes information indicating whether the corresponding main block is to be split,
when the information indicates that the corresponding main block is to be split, the corresponding main block is split into two or more sub-blocks.
2 . The immersive video encoding method of claim 1 , wherein the depth atlas is generated using basic view images corresponding to a preset condition.
3 . The immersive video encoding method of claim 2 , wherein setting the basic view images comprises:
reshuffling an order of the set basic view images.
4 . The immersive video encoding method of claim 3 , wherein the basic view images corresponding to the preset condition include an image for a most distant view among the basic view images.
5 . The immersive video encoding method of claim 4 , wherein the metadata includes data indicating whether the encoded atlas image has depth information.
6 . The immersive video encoding method of claim 1 , wherein each of the main blocks is split into four sub-blocks equal to each other in a height and a width, two sub-blocks equal to each other in a height and a width, or two sub-blocks different from each other in any one of a height and a width, depending on a split type.
7 . The immersive video encoding method of claim 6 , wherein the metadata includes second information indicating a split type.
8 . The immersive video encoding method of claim 6 , wherein each sub-block is recursively split into one or more sub-blocks based on whether the corresponding block is to be split.
9 . The immersive video encoding method of claim 1 , wherein:
the metadata includes information about a split type of the depth atlas, and
the split type includes a block-based split type.
10 . An immersive video decoding method, comprising:
decoding an input bitstream; and
rendering an immersive video based on a decoded image and decoded metadata,
wherein the decoded image includes a texture atlas and a depth atlas,
the depth atlas is split into multiple main blocks,
the metadata includes information indicating whether the corresponding main block is to be split,
when the information indicates that the corresponding main block is to be split the corresponding main block is split into two or more sub-blocks.
11 . The immersive video decoding method of claim 10 , wherein the depth atlas corresponds to basic view images corresponding to a preset condition.
12 . The immersive video decoding method of claim 11 , wherein the basic view images corresponding to the preset condition include an image for a most distant view among multiple basic view images.
13 . The immersive video decoding method of claim 12 , wherein the metadata includes data indicating whether the decoded image has depth information.
14 . The immersive video decoding method of claim 10 , wherein each of the main blocks is split into four sub-blocks equal to each other in a height and a width, two sub-blocks equal to each other in a height and a width, or two sub-blocks different from each other in any one of a height and a width, depending on a split type.
15 . The immersive video decoding method of claim 14 , wherein the metadata includes second information indicating a split type.
16 . The immersive video decoding method of claim 14 , wherein each sub-block is recursively split into one or more sub-blocks based on whether the corresponding block is to be split.
17 . The immersive video decoding method of claim 10 , wherein:
the metadata includes information about a split type of the depth atlas, and the split type includes a block-based split type.