Recovery of Shape and Surface Reflectance of Specular Object from Rotation of Light Source

In this paper, we present a method for recovery of shape and surface re ectance of specular object from color images taken with the light source rotating. The image sequence is taken with a xed camera while the light source is relatively rotating around the axis parallel to the optical axis of the camera. We derive the relationship between the body re ectance at every object surface point and the rotating angle of the object. For adapting specular re ectance case, we develop the algorithm to extract only body re ectance component which obeys the derived relationship for estimating surface normals and body re ectance component. As a result, the object shape and body re ectance distribution of the object surface can be recovered. In addition to this, re ectance parameters of specularity are also estimated by minimize the tting error of specular re ectance model. For demonstrating the e ectiveness of the proposed method, we show the shape, body re ectance, and specular re ectance of specular objects, which are successfully recovered by the proposed method.