The KGBR Viewpoint-Lighting Ambiguity and Its Resolution by Generic Constraints
Abstract
We describe a novel viewpoint-lighting ambiguity which we call the KGBR. This ambiguity assumes orthographic projecting or an affine camera, and uses Lambertian reflectance functions including case/attached shadows and multiple light sources. A KGBR transform alters the geometry (by a three-dimensional affine transformation) and albedo properties of objects. If two objects are related by a KGBR transform then for any viewpoint and lighting of the first object there exists a corresponding viewpoint and lighting of the second object so that the images are identical up to an affine transformation. The Generalized Bas Relief (GBR) ambiguity is obtained as a special case of the KGBR. We describe generic viewpoint and lighting assumptions and show that either, or both, resolve this ambiguity by biasing towards objects with planar geometry.
Cite
Text
Yuille et al. "The KGBR Viewpoint-Lighting Ambiguity and Its Resolution by Generic Constraints." IEEE/CVF International Conference on Computer Vision, 2001. doi:10.1109/ICCV.2001.937650Markdown
[Yuille et al. "The KGBR Viewpoint-Lighting Ambiguity and Its Resolution by Generic Constraints." IEEE/CVF International Conference on Computer Vision, 2001.](https://mlanthology.org/iccv/2001/yuille2001iccv-kgbr/) doi:10.1109/ICCV.2001.937650BibTeX
@inproceedings{yuille2001iccv-kgbr,
title = {{The KGBR Viewpoint-Lighting Ambiguity and Its Resolution by Generic Constraints}},
author = {Yuille, Alan L. and Coughlan, James M. and Konishi, Scott},
booktitle = {IEEE/CVF International Conference on Computer Vision},
year = {2001},
pages = {376-382},
doi = {10.1109/ICCV.2001.937650},
url = {https://mlanthology.org/iccv/2001/yuille2001iccv-kgbr/}
}