Image processing apparatus and method

1. An image processing apparatus comprising:

circuitry configured to:

project 3D data representing a three-dimensional structure on a two-dimensional plane to obtain a projected image;

generate geometry data including

a frame image on which the projected image is arranged, and

a special value indicating first occupancy map information in a range; and

encode the geometry data.

2. The image processing apparatus according to claim 1 , wherein the special value indicates that the projected image is not present.

3. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to:

set the special value in the range of the geometry data; and

generate the geometry data including the special value in the range.

4. The image processing apparatus according to claim 3 , wherein the circuitry is further configured to set, as the special value, at least one of a minimum value, a maximum value, or an intermediate value of the range of the geometry data.

5. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to:

set a margin having a predetermined width between a range indicating a depth value indicating a position of the 3D data and the special value in the range of the geometry data; and

generate the geometry data including the special value and the margin in the range.

6. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to set a threshold for identifying a depth value indicating a position of the 3D data and the special value.

7. The image processing apparatus according to claim 6 , wherein the circuitry is further configured to:

decode the encoded geometry data; and

set the threshold based on the decoded geometry data.

8. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to correct a range of a depth value indicating a position of the 3D data to generate the geometry data including the special value in the corrected range.

9. The image processing apparatus according to claim 8 , wherein the circuitry is further configured to quantize or shift the depth value to correct the range of the depth value.

10. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to generate a bitstream including the encoded geometry data and a parameter associated with the special value.

11. The image processing apparatus according to claim 10 , wherein the parameter includes at least one of information indicating the special value, information indicating a margin between a range indicating a depth value indicating a position of the 3D data and the special value, or information indicating a threshold for identifying the depth value and the special value.

12. The image processing apparatus according to claim 10 , wherein the circuitry is further configured to generate the bitstream including the parameter in units of patches, frames, or sequences.

13. The image processing apparatus according to claim 1 , wherein the circuitry is further configured to generate geometry data including the special value in a range of data in a certain region satisfying a predetermined condition of the frame image.

14. The image processing apparatus according to claim 13 , wherein the circuitry is further configured to generate the geometry data including the special value in a range of data in a region based on second occupancy map information having a resolution lower than that of the first occupancy map information of the geometry data.

15. An image processing method, comprising:

projecting 3D data representing a three-dimensional structure on a two-dimensional plane to obtain a projected image;

generating geometry data including

a frame image on which the projected image is arranged, and

a special value indicating occupancy map information in a range; and

encoding the geometry data.

16. An image processing apparatus, comprising:

circuitry configured to:

decode encoded data on geometry data including

a frame image on which a projected image of 3D data on a two-dimensional plane is arranged, the 3D data representing a three-dimensional structure, and

a special value indicating first occupancy map information in a range; and

extract, from the geometry data, a depth value indicating a position of the 3D data and the first occupancy map information.

17. The image processing apparatus according to claim 16 , wherein the circuitry is further configured to extract the depth value and the special value, based on a parameter associated with the special value.

18. The image processing apparatus according to claim 16 , wherein the circuitry is further configured to correct a range of the depth value.

19. The image processing apparatus according to claim 16 , wherein the circuitry is further configured to synthesize the first occupancy map information and second occupancy map information having a resolution lower than that of the first occupancy map information.

20. An image processing method, comprising:

decoding encoded data on geometry data including

a frame image on which a projected image of 3D data on a two-dimensional plane is arranged, the 3D data representing a three-dimensional structure, and

a special value indicating occupancy map information in a range; and

extracting, from the geometry data, a depth value indicating a position of the 3D data and the occupancy map information.