Mosaic image processing device, method, and program using 3D information

Realized is a 3D mosaic image generating technique enabling mapping of a material image with any polygon. Texture images are allocated to the polygons resulting from division on the basis of the input polygon number. The average density value of each base color of texture image portions is calculated as a target density value. The polygon in which one material image will be disposed is decided without reliance on the color density of the texture image, and the average density value of each base color within the material image is calculated. Each base-color density distribution rate for material images is maintained and the material images are color corrected so that the base-color average density values within material images become the target density values of the base colors of texture image portions within polygons.