Structured Light in Scattering Media

Srinivasa G. Narasimhan, Shree K. Nayar, Bo Sun, and Sanjeev Jagannatha Koppal
International Conference on Computer Vision (ICCV), October, 2005, pp. 420 - 427.


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Abstract
Virtually all structured light methods assume that the scene and the sources are immersed in pure air and that light is neither scattered nor absorbed. Recently, however, structured lighting has found growing application in underwater and aerial imaging, where scattering effects cannot be ignored. In this paper, we present a comprehensive analysis of two representative methods - light stripe range scanning and photometric stereo - in the presence of scattering. For both methods, we derive physical models for the appearances of a surface immersed in a scattering medium. Based on these models, we present results on (a) the condition for object detectability in light striping and (b) the number of sources required for photometric stereo. In both cases, we demonstrate that while traditional methods fail when scattering is significant, our methods accurately recover the scene (depths, normals, albedos) as well as the properties of the medium. These results are in turn used to restore the appearances of scenes as if they were captured in clear air. Although we have focused on light striping and photometric stereo, our approach can also be extended to other methods such as grid coding, gated and active polarization imaging.

Keywords
structured light, scattering, underwater imaging, light stripe scanning, photometric stereo

Notes
Number of pages: 8

Text Reference
Srinivasa G. Narasimhan, Shree K. Nayar, Bo Sun, and Sanjeev Jagannatha Koppal, "Structured Light in Scattering Media," International Conference on Computer Vision (ICCV), October, 2005, pp. 420 - 427.

BibTeX Reference
@inproceedings{Narasimhan_2005_5084,
   author = "Srinivasa G Narasimhan and Shree K. Nayar and Bo Sun and Sanjeev Jagannatha Koppal",
   title = "Structured Light in Scattering Media",
   booktitle = "International Conference on Computer Vision (ICCV)",
   pages = "420 - 427",
   month = "October",
   year = "2005",
   volume = "1",
}