Sciweavers

Share
ECCV
2010
Springer

Visibility Subspaces: Uncalibrated Photometric Stereo with Shadows

10 years 6 months ago
Visibility Subspaces: Uncalibrated Photometric Stereo with Shadows
Photometric stereo relies on inverting the image formation process, and doing this accurately requires reasoning about the visibility of light sources with respect to each image point. While simple heuristics for shadow detection suffice in some cases, they are susceptible to error. This paper presents an alternative approach for handling visibility in photometric stereo, one that is suitable for uncalibrated settings where the light directions are not known. A surface imaged under a finite set of light sources can be divided into regions having uniform visibility, and when the surface is Lambertian, these regions generally map to distinct three-dimensional illumination subspaces. We show that by identifying these subspaces, we can locate the regions and their visibilities, and in the process identify shadows. The result is an automatic method for uncalibrated Lambertian photometric stereo in the presence of shadows, both cast and attached.
Added 02 Jul 2010
Updated 02 Jul 2010
Type Conference
Year 2010
Where ECCV
Comments (0)
books