File generation apparatus, image generation apparatus based on file, file generation method and storage medium

1. An image generation apparatus comprising:

one or more memories storing instructions; and

one or more processors executing the instructions to:

input a file including material data used for generation of a virtual viewpoint image that is to be generated based on images captured from a plurality of viewpoints, type information for specifying a type of the material data, and data information specifying each item of the material data is included in the file, wherein each item of the material data is stored in a common format, each item of the material data being at least two or more items among a plurality of captured images obtained by using a plurality of imaging apparatuses, parameters of the plurality of imaging apparatuses, a foreground image of the plurality of captured images, a background image of the plurality of captured images, a foreground 3D model representing a three-dimensional shape of a foreground object and a background 3D model representing a three-dimensional shape of a background object;

determine, based on the data information, whether it is possible to generate the virtual viewpoint image where the material data included in the file meet the material data required for the generation; and

generate, in a case where it is determined that generation is possible, a virtual viewpoint image based on the material data included in the input file.

2. The image generation apparatus according to claim 1 wherein

in a case where the material data specified by the data information meets material data required in accordance with a function of the generation, a determination that it is possible to generate a virtual viewpoint image is performed.

3. The image generation apparatus according to claim 1 wherein

the one or more processors further execute the instructions to notify a user of results in the determination.

4. The image generation apparatus according to claim 1 , wherein

the virtual viewpoint image is generated based on at least a function to color the foreground 3D model representing a three-dimensional shape of the foreground object in a captured image of each imaging apparatus.

5. The image generation apparatus according to claim 4 , wherein

a kind of the foreground 3D model is one of a 3D model represented by a point cloud, a 3D model represented by a mesh, and a 3D model in a billboard format, and

the virtual viewpoint image is generated by determining a foreground 3D model that is used in accordance with a predetermined criterion in a case where a plurality of kinds of foreground 3D model is included in the file and using the determined foreground 3D model.

6. The image generation apparatus according to claim 5 , wherein

the predetermined criterion is priority determined in advance for the kind of foreground 3D model.

7. The image generation apparatus according to claim 5 , wherein

the predetermined criterion is a criterion that specifies which kind of the foreground 3D model is used in accordance with a generation mode of the virtual viewpoint image.

8. The image generation apparatus according to claim 4 , wherein

the foreground 3D model is generated by using a foreground silhouette image in a captured image of each imaging apparatus and parameters including at least a position and an orientation of each imaging apparatus, which are included in material data included in the file; and

the virtual viewpoint image is generated by coloring for the generated foreground 3D model.

9. The image generation apparatus according to claim 4 , wherein

the virtual viewpoint image is generated by:

generating a foreground silhouette image by performing foreground/background separation for a captured image of each imaging apparatus, which is included in material data included in the file;

generating a foreground 3D model by using parameters including at least a position and an orientation of each of the imaging apparatus, which are included in the material data, and the generated foreground silhouette image; and

generating the virtual viewpoint image by coloring for the generated foreground 3D model.

10. The image generation apparatus according to claim 1 , wherein

the virtual viewpoint image is generated by:

determining material data necessary for generation of the virtual viewpoint image based on a virtual viewpoint that is set;

acquiring the determined necessary material data from the file; and

using the acquired material data.