Image generation apparatus, image generation method, and program

An image generation method of generating a virtual space image representing a situation of a virtual space as viewed from a virtual camera in the virtual space provided with a polygon model based on a plurality of captured images of a subject arranged in a real space from a plurality of real cameras, the image generation method comprising:

• specifying, for each of the plurality of real cameras, a corresponding camera position that is a position in the virtual space equivalent to a captured position that is a position in the real space of each real camera of the plurality of real cameras;
• determining a final influence degree value for each real camera of the plurality of real cameras by:
• determining an influence degree parameter in a virtual camera direction;
• determining an influence degree parameter in a normal camera direction;
• and
• multiplying a linear combination of the influence degree parameter in the virtual camera direction and the influence degree parameter in the normal camera direction by a weight associated with the real camera to determine the final influence degree value,
• wherein the final influence degree value is set to zero for each real camera if a point R on the polygon model is not present in the captured image;
• determining final pixel values S for each point R of the polygon model by calculating a weighted average of pixel values from each of the captured images using the final influence degree for each real camera of the plurality of real cameras;
• and
• generating the virtual space image using the final pixel values S for each point R of the polygon model.

A non-transitory computer readable storage medium having stored thereon a program for generating a virtual space image representing a situation of a virtual space as viewed from a virtual camera in the virtual space provided with a polygon model based on a plurality of captured images of a subject arranged in a real space from a plurality of real cameras, the program for a computer comprising:

• by a corresponding camera position specification unit, specifying a corresponding camera position that is a position in the virtual space equivalent to a captured position that is a position in the real space of each real camera of the plurality of real cameras;
• by an influence degree determination unit, determining a final influence degree value for each real camera of the plurality of real cameras by:
• determining an influence degree parameter in a virtual camera direction;
• determining an influence degree parameter in a normal camera direction;
• and
• multiplying a linear combination of the influence degree parameter in the virtual camera direction and the influence degree parameter in the normal camera direction by a weight associated with the real camera to determine the final influence degree value,
• wherein the final influence degree value is set to zero for each real camera if a point R on the polygon model is not present in the captured image;
• by a pixel value determination unit, determining final pixel values S for each point R of the polygon model by calculating a weighted average of pixel values from each of the captured images using the final influence degree for each real camera of the plurality of real cameras;
• and
• by a virtual space image generation unit, generating the virtual space image using the final pixel values S for each point R of the polygon model.