Color Subspaces as Photometric Invariants

  • Authors:
  • Todd Zickler;Satya P. Mallick;David J. Kriegman;Peter N. Belhumeur

  • Affiliations:
  • Harvard University, Cambridge, USA 02138;University of California, San Diego, USA;University of California, San Diego, USA;Columbia University, New York, USA 10027

  • Venue:
  • International Journal of Computer Vision
  • Year:
  • 2008

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Abstract

Complex reflectance phenomena such as specular reflections confound many vision problems since they produce image `features' that do not correspond directly to intrinsic surface properties such as shape and spectral reflectance. A common approach to mitigate these effects is to explore functions of an image that are invariant to these photometric events. In this paper we describe a class of such invariants that result from exploiting color information in images of dichromatic surfaces. These invariants are derived from illuminant-dependent `subspaces' of RGB color space, and they enable the application of Lambertian-based vision techniques to a broad class of specular, non-Lambertian scenes. Using implementations of recent algorithms taken from the literature, we demonstrate the practical utility of these invariants for a wide variety of applications, including stereo, shape from shading, photometric stereo, material-based segmentation, and motion estimation.