Structured Light in Scattering Media

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 a...

• Type: Conference
• Year: 2005
• Where: ICCV
• Authors: Srinivasa G. Narasimhan, Shree K. Nayar, Bo Sun, Sanjeev J. Koppal
• Keywords: Computer Vision, ICCV 2005, Light Methods, Light Stripe Range, Light Striping, Photometric Stereo, Scattering Medium