Illumination invariance at a single pixel

Graham D. Finlayson, Steven D. Hordley, Michael H. Brill

Research output: Contribution to conferencePaper

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.
Original languageEnglish
Pages85-90
Number of pages6
Publication statusPublished - Nov 2000
EventEighth Color Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications - Scottsdale, Arizona
Duration: 1 Nov 2000 → …

Conference

ConferenceEighth Color Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications
CityScottsdale, Arizona
Period1/11/00 → …

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