Bischof, W. F. and Ferraro, M. (1989). Curved mondrians: shading analysis of patterned objects. Computational Intelligence, 5, 121-126.

Most shape-from-shading methods assume that surface reflectance is constant within large image regions. This assumption is violated in natural scenes with objects made from different materials. We present a more general method for recovering shape from shading, assuming that surfaces are smooth and albedo is piecewise constant, as would be the case if a Mondrian image was painted on a smooth curved surface. Our method is based on combining Brooks and Horn's method for shape recovery with recovery of albedo using stochastic relaxation.

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