A Robust Illumination Estimate for Chromatic Adaptation in Rendered Images

Alexander Wilkie, Andrea Weidlich
A Robust Illumination Estimate for Chromatic Adaptation in Rendered Images
Computer Graphics Forum, 28(4):1101-1109, June 2009. [ paper]
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Abstract

We propose a method that improves automatic colour correction operations for rendered images. In particular, we propose a robust technique for estimating the visible and pertinent illumination in a given scene. We do this at very low computational cost by mostly re-using information that is already being computed during the image synthesis process. Conventional illuminant estimations either operate only on 2D image data, or, if they do go beyond pure image analysis, only use information on the luminaires found in the scene. The latter is usually done with little or no regard for how the light sources actually affect the part of the scene that is being viewed. Our technique goes beyond that, and also takes object reflectance into account, as well as the incident light that is actually responsible for the colour of the objects that one sees. It is therefore able to cope with difficult cases, such as scenes with mixed illuminants, complex scenes with many light sources of varying colour, or strongly coloured indirect illumination.

Additional Files and Images

Additional images and videos:
image2 image2: Successively larger levels of chromatic adaptation under two different illuminants. Our technique can automatically perform a complete compensation (rightmost images), although to match real human chromatic adaptation, an almost complete compensation (fourth column) is more reasonable.
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BibTeX

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@article{wilkie-2009-cc,
  title =      "A Robust Illumination Estimate for Chromatic Adaptation in
               Rendered Images",
  author =     "Alexander Wilkie and Andrea Weidlich",
  year =       "2009",
  abstract =   "We propose a method that improves automatic colour
               correction operations for rendered images. In particular, we
               propose a robust technique for estimating the visible and
               pertinent illumination in a given scene. We do this at very
               low computational cost by mostly re-using information that
               is already being computed during the image synthesis 
               process. Conventional illuminant estimations either operate
               only on 2D image data, or, if they do go beyond pure image
               analysis, only use information on the luminaires found in
               the scene. The latter is usually done with little or no
               regard for how the light sources actually affect the part of
               the scene that is being viewed. Our technique goes beyond
               that, and also takes object reflectance into account,
               as well as the incident light that is actually responsible
               for the colour of the objects that one sees. It is therefore
               able to cope with difficult cases, such as scenes with
               mixed illuminants, complex scenes with many light sources of
               varying colour, or strongly coloured indirect illumination. ",
  pages =      "1101--1109",
  month =      6,
  number =     "4",
  event =      "Eurographics Symposium on Rendering 2009",
  journal =    "Computer Graphics Forum",
  volume =     "28",
  location =   "Girona, Spain",
  keywords =   "chromatic adaptation, predicitve rendering, colour constancy",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2009/wilkie-2009-cc/",
}