Simultaneous estimation of shape and reflectance maps from photometric stereo

The authors address the issue of whether the shape of an object and certain parameters of its reflectance map can be jointly estimated using photometric stereo. This problem has been addressed in the literature for the case where the Lambertian and non-Lambertian components in the image can be easily separated. The authors do not assume each separability. They highlight some aspects of the detailed solution to the above problem