Effective search for a silhouette cone to reconstruct a three dimensional shape of an object

A non-transitory, computer-readable recording medium having stored therein a program for causing a computer to execute a process comprising:

• sequentially acquiring, from a plurality of reference imaging devices for imaging a silhouette imaged with a base imaging device from viewpoints different from a viewpoint of the base imaging device, silhouette existing position information based on the reference imaging devices, the silhouette existing position information indicating an existing position of the silhouette, and transforming the silhouette existing position information into a common coordinate system;
• detecting a silhouette absence range in which the silhouette does not exist, based on a result of comparison of the silhouette existing position information acquired this time and the silhouette existing position information acquired last time;
• and
• searching a range in which the silhouette exists, based on the silhouette absence range.

An information processing method comprising:

• sequentially acquiring, from a plurality of reference imaging devices for imaging a silhouette imaged with a base imaging device from viewpoints different from a viewpoint of the base imaging device, silhouette existing position information based on the reference imaging devices, the silhouette existing position information indicating an existing position of the silhouette, and transforming the silhouette existing position information into a common coordinate system;
• detecting a silhouette absence range in which the silhouette does not exist, based on a result of comparison of the silhouette existing position information acquired this time and the silhouette existing position information acquired last time;
• and
• searching a range in which the silhouette exists, based on the silhouette absence range.

An information processing device comprising:

• a memory storing instructions;
• and
• a processor, coupled to the memory, that executes the instructions to perform a process comprising:
• generating a plurality of viewpoint images, of an object, obtained from a plurality of viewpoints from at least a base image device and a reference image device;
• separating silhouette images of the object from the viewpoint images;
• acquiring a plurality of image device parameters;
• acquiring a base silhouette image from the base image device and a reference silhouette image from the reference image device;
• generating transformation information based on the image device parameters;
• and
• rendering a three-dimensional image of the object based on the viewpoint images, silhouette images, image device parameters, and the transformation information.