IEEE Transactions on Computers - Special issue on artificial neural networks
3D surface reconstruction by combination of photopolarimetry and depth from defocus
PR'05 Proceedings of the 27th DAGM conference on Pattern Recognition
3D reconstruction of metallic surfaces by photopolarimetric analysis
SCIA'05 Proceedings of the 14th Scandinavian conference on Image Analysis
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The method described here for recovering the shape of a surface from a shaded image can deal with complex, wrinkled surfaces. Integrability can be enforced easily because both surface height and gradient are represented. The robustness of the method stems in part from linearization of the reflectance map about the current estimate of the surface orientation at each picture cell. The new scheme can find an exact solution of a given shape-from-shading problem even though a regularizing term is included. This is a reflection of the fact that shape-from-shading problems are {\it not} ill-posed when boundary conditions are available or when the image contains singular points.