Abstract
In order to provide a realistic CG model, it is important to include specular reflectance in addition to textures. This paper describes a method for estimating specular parameters for a free-form object with known geometry data using readily available equipments: a PC, a video camera, and a lighting device. First, the object surface is classified into several regions that have identical specular reflectance. Secondly, specular parameters are measured by moving the camera. The positions of the camera and lighting device are estimated based upon pictures from the camera. The system was implemented on a PC. The total time to measure optical properties at 26 frames (or camera positions) was found to be approximately 30 minutes.
