A Method for Enforcing Integrability in Shape from Shading Algorithms
IEEE Transactions on Pattern Analysis and Machine Intelligence
Photometric method for determining surface orientation from multiple images
Shape from shading
Stereo Image Analysis of Non-Lambertian Surfaces
International Journal of Computer Vision
High-quality single-shot capture of facial geometry
ACM SIGGRAPH 2010 papers
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In photometric stereo one of the common problems may be inter-reflections occurring in concave surface parts of the object. They may locally blur the images in shade, resulting in a locally distorted shape. The effects may be more significant with increasing curvature of the concavity. Another problem may be non-Lambertian reflection, in which case shape reconstruction based on the Lambertian reflection may give non-local distortions. A combination of the diffuse and specular reflections called directional diffuse reflection may be typical of the non-Lambertian reflections. In this paper, we present image processing methods of reducing the effects of the two problems. They are described mathematically, and experimental results are given to examine the two methods.