Rendering virtual images with specular reflection at virtual viewpoints based on calibrated images

Based on IBMR techniques, this paper present a method to separate elements of specular and diffuse reflection in an image. The ray projected from object surface to images includes energy distribution from ambient light, diffuse and specular light. The ray intensity of diffuse reflection or ambient light is irrelevant to viewpoint, but that of specular reflection will change with the moving of viewpoint. This paper suppose that the minimal energy of reflection lighting in several corresponding points is the part brought by diffuse reflection and ambient light, so as to separate diffuse and specular reflection.