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Volume: 8 | Article ID: art00017
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Illuminant invariance at a single pixel
  DOI :  10.2352/CIC.2000.8.1.art00017  Published OnlineJanuary 2000
Abstract

This paper addresses the question of what can be said about the colors in images that is independent of illumination. We make two main assumptions: Firstly, the illumination can be characterized as Planckian (a realistic assumption for most real scenes). Secondly, the camera behaves as if it were equipped with narrow band sensors (true for a large number of cameras). An alternative set of assumptions (with broad-band sensors) leading to the same invariant expression is also presented to show the robustness of the invariant. The resulting physics-based method results in a transformation of the original color image to a grey-scale one which does not vary with illumination. Experiments demonstrate that the distribution of grey-scale invariants in an image is a reliable cue for illumination independent object recognition.

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Graham D. Finlayson, Steven D. Hordley, Michael H. Brill, "Illuminant invariance at a single pixelin Proc. IS&T 8th Color and Imaging Conf.,  2000,  pp 85 - 90,  https://doi.org/10.2352/CIC.2000.8.1.art00017

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