For general objects, and for illumination from a general direction, we study the constraints on
shape imposed by shading. Assuming generalized Lambertian reflectance, we argue that …

Shape from shading schemes are based on the assumption that image radiance is a
function of surface normal alone. Unfortunately, because surfaces illuminate one another …

This article proposes a solution of the Lambertian Shape From Shading (SFS) problem by
designing a new mathematical framework based on the notion of viscosity solutions. The …

Well-known methods for solving the shape-from-shading problem require knowledge of the
reflectance map. Here we show how the shape-from-shading problem can be solved when …

This article presents an approach to the shape from shading problem which is based upon
the notion of viscosity solutions to the shading partial differential equation, in effect a …

Estimation of illuminant direction, albedo, and shape from shading Page 58 Estimation of
Illuminant Direction, Albedo, and Shape from Shading 39 Estimation of Illuminant Direction …

For general images of smooth objects wholly contained in the field of view, and for
illumination symmetric around the viewing direction, it is proven that shape is uniquely …

Shape from shading is known to be an ill-posed problem. We show in this paper that if we
model the problem in a different way than it is usually done, more precisely by taking into …

It is now well established that the shading present in an image of an object is a potential
source of 3-D shape information. With this in mind, we seek constraints arising out of the …

Well-known methods for solving the shape-from-shading problem require knowledge of the
reflectance map. Here we show how the shape-from-shading problem can be solved when …