1. Numerical shape from shading and occluding boundaries;Ikeuchi,1981
2. Surface description from stereo and shading;Blake;Image & Vision Comput.,1985
3. Photometric invariants related to solid shape;Koenderinck;Optica Acta,1980
4. Inferring surface shape from specular reflections;Brelstaff,1988
5. Highlight identification using chromatic information;Gershon,1987