1. Recovering intrinsic scene characteristics from images;Barrow,1978
2. Shape from shading: a method for obtaining the shape of a smooth opaque object from one view;Horn,1970
3. Numerical shape from shading and occluding boundaries;Ikeuchi;Artificial Intelligence,1981
4. Shape from texture: an aggregation transform that maps a class of textures into surface orientation;Kender,1979
5. Recovering surface shape and orientation from texture;Witkin;Artificial Intelligence,1981