Uncalibrated photometric stereo based on elevation angle recovery from BRDF symmetry of isotropic materials

@article{Lu2015UncalibratedPS,
  title={Uncalibrated photometric stereo based on elevation angle recovery from BRDF symmetry of isotropic materials},
  author={Feng Lu and Imari Sato and Yoichi Sato},
  journal={2015 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  year={2015},
  pages={168-176}
}
This paper addresses the problem of uncalibrated photometric stereo with isotropic reflectances. Existing methods face difficulty in solving for the elevation angles of surface normals when the light sources only cover the visible hemisphere. Here, we introduce the notion of “constrained half-vector symmetry” for general isotropic BRDFs and show its capability of elevation angle recovery. This sort of symmetry can be observed in a 1D BRDF slice from a subset of surface normals with the same… CONTINUE READING
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