Illumination invariance at a single pixel

Finlayson, Graham D., Hordley, Steven D. and Brill, Michael H. (2000) Illumination invariance at a single pixel. In: 8th Color Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications, 2000-11-01.

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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.

Item Type: Conference or Workshop Item (Paper)
Faculty \ School: Faculty of Science > School of Computing Sciences
UEA Research Groups: Faculty of Science > Research Groups > Interactive Graphics and Audio
Faculty of Science > Research Groups > Colour and Imaging Lab
Depositing User: Vishal Gautam
Date Deposited: 26 Aug 2011 13:48
Last Modified: 20 Jun 2023 14:35

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