Device and method for processing high-definition 360-degree VR image

1. A method of decoding a 360-degree image, the method comprising:

receiving a bitstream including 360-degree virtual reality (VR) image information;

obtaining respectively a first 360-degree VR image having a first resolution and a second 360-degree VR image having a second resolution higher than the first resolution;

decoding first signaling information and second signaling information related to a 360-degree VR service from the bitstream;

detecting a region of interest based on the first signaling information and second signaling information; and

providing to a user an image for the region of interest from at least one of the first 360-degree VR image and the second 360-degree VR image, based on whether the region of interest is being changed or the region of interest is selected,

wherein the first signaling information is applied to a program or to a service level, and

wherein the second signaling information is applied to a stream level of each of a plurality of sub-regions generated by dividing the second 360-degree VR image.

2. The method of claim 1 , wherein the first signaling information includes projection type information used to perform mapping the first 360-degree image and the second 360-degree image, and division information indicating a number of the plurality of sub-regions.

3. The method of claim 1 , wherein the second signaling information includes first 360-degree image selection information indicating whether or not to provide the first 360-degree image to the user, and identification information about at least one of the plurality of sub-regions to be provided firstly to the user.

4. The method of claim 1 , wherein a size of the image for the region of interest is re-adjusted to be suitable for providing to the user.

5. The method of claim 1 , when the region of interest is being changed, wherein the image for the region of interest is provided to the user by performing mapping the first 360-degree image and at least one of the plurality of sub-regions corresponding to the region of interest.

6. The method of claim 1 , when the region of interest is selected, wherein the image for the region of interest is provided to the user from at least one sub-region corresponding to the region of interest among the plurality of sub-regions, without the first 360-degree VR image.

7. An apparatus for decoding a 360-degree image, the apparatus comprising:

a receiving module receiving a bitstream including 360-degree VR image information;

a buffer module obtaining respectively a first 360-degree VR image having a first resolution and a second 360-degree VR image having a second resolution higher than the first resolution;

a viewport control module extracting an image for a region of interest from a plurality of sub-regions of the second 360-degree image, based on at least one of motion information of a user and an input of the user, the plurality of sub-regions are generated by dividing the second 360-degree image;

a decoder module decoding signaling information related to a 360-degree VR service, the first 360-degree image and the image for the region of interest;

an RoI mapping module re-adjusting a size of the image for the region of interest, based on a resolution information supported by a terminal of the user; and

a 360-degree VR mapping module performing mapping the image for the region of interest and the first 360-degree VR image, based on whether the region of interest is being changed or the region of interest is selected.

8. The apparatus of claim 7 , the signaling information includes first signaling information being applied to a program or to a service level, and second signaling information being applied to a stream level of each of a plurality of sub-regions generated by dividing the second 360-degree VR image.

9. The apparatus of claim 8 , wherein the first signaling information includes projection type information used to perform mapping the first 360-degree image and the second 360-degree image, and division information indicating a number of the plurality of sub-regions.

10. The apparatus of claim 8 , wherein the second signaling information includes first 360-degree image selection information indicating whether or not to provide the first 360-degree image to the user.

11. The apparatus of claim 10 , when the first 360-degree image is not provided to the user, wherein the second signaling information further includes identification information about at least one of the plurality of sub-regions to be provided firstly to the user.

12. The apparatus of claim 8 , wherein the viewport control module extracts the image for the region of interest as at least one of a plurality of sub-regions of the second 360-degree VR image.

13. The method of claim 1 , wherein the obtained first 360-degree VR image and the obtained second 360-degree VR image are synchronized based on at least one of a decoding time stamp (DTS) and a presentation time stamp (PTS).

14. The apparatus of claim 7 , wherein the buffer module synchronizes the obtained first 360-degree image and the obtained second 360-degree image, based on at least one of a decoding time stamp (DTS) and a presentation time stamp (PTS).

15. The apparatus of claim 7 , when the region of interest is selected, wherein the 360-degree VR mapping module outputs the image for the region of interest without performing mapping with the first 360-degree VR image.

16. A method of encoding a 360-degree image, the method comprising:

receiving 360-degree VR image information related to a first 360-degree VR image having first resolution and a second 360-degree VR image having second resolution higher than the first resolution;

recognizing a region of interest of a user; and

encoding the first 360-degree VR image, the second 360-degree VR image, first signaling information used to distinguish the first 360-degree VR image and the second 360-degree VR image, and second signaling information used to provide an image for the region of interest,

wherein the second 360-degree VR image is divided into a plurality of sub-regions, and at least one of the plurality of sub-regions for the region of interest is encoded and output through one or more channels,

wherein the first signaling information is applied to a program or to a service level, and

wherein the second signaling information is applied to a stream level of each of the plurality of sub-regions.

17. The method of claim 16 ,

wherein the first signaling information includes projection type information used to perform mapping the first 360-degree image and the second 360-degree image, and division information indicating a number of the plurality of sub-regions, and

wherein the second signaling information includes first 360-degree image selection information indicating whether or not to provide the first 360-degree image to the user, and identification information about at least one of the plurality of sub-regions to be provided firstly to the user.

18. The method of claim 16 , when the first 360-degree image is not provided to the user, wherein the second signaling information further includes identification information about at least one of the plurality of sub-regions to be provided firstly to the user.

19. An apparatus for encoding a 360-degree image, wherein the apparatus receives 360-degree VR image information related to a first 360-degree VR image having first resolution and a second 360-degree VR image having second resolution higher than the first resolution, recognizes a region of interest of a user, encodes the first 360-degree VR image, the second 360-degree VR image, first signaling information used to distinguish the first 360-degree VR image and the second 360-degree VR image, and second signaling information used to provide an image for the region of interest to the user,

wherein the second 360-degree VR image is divided into a plurality of sub-regions, and at least one of the plurality of sub-regions for the region of interest is encoded and output through one or more channels,

wherein the first signaling information is applied to a program or to a service level, and

wherein the second signaling information is applied to a stream level of each of the plurality of sub-regions.

20. The apparatus of claim 19 ,

wherein the first signaling information includes projection type information used to perform mapping the first 360-degree image and the second 360-degree image, and division information indicating a number of the plurality of sub-regions, and

wherein the second signaling information includes first 360-degree image selection information indicating whether or not to provide the first 360-degree image to the user.

21. The apparatus of claim 19 , when the first 360-degree image is not provided to the user, wherein the second signaling information further includes identification information about at least one of the plurality of sub-regions to be provided firstly to the user.