Local sign of the Gaussian curvature from eigen plane using multiple shading images

摘要

This paper proposes a new approach to recover the local sign of the Gaussian curvature using multiple shading images without information of the surface reflectance function and the directions of light sources. The method has some advantages that it gives more robust results and it can recover the correct sign of the Gaussian curvature for the possible larger area of object by using many images taken under multiple light source directions in comparison with other conventional approaches. We tried to recover the correct sign of the Gaussian curvature in the glossy area by taking advantage of multiple rotational light sources.