Projected area based 3d shape similarity evaluation

Because the appearance of 3D objects changes according to viewing directions, it is not easy to evaluate similarity between two objects in a few appearances In this paper we propose similarity measure between two shapes of 3D objects The feature of a shape is represented by a distribution of a projected area on a unit sphere, and the distribution is expanded in spherical harmonics The degree of similarity between several kinds of shape is calculated and is compared with human sense The results of computer simulation demonstrate the validity of our method.