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Proceedings Paper

WhitebalPR: automatic white balance by polarized reflections
Author(s): Gregor Fischer; Karin Kolbe; Matthias Sajjaa
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Paper Abstract

This new color constancy method is based on the polarization degree of that light which is reflected at the surface of an object. The subtraction of at least two images taken under different polarization directions detects the polarization degree of the neutrally reflected portions and eliminates the remitted non-polarized colored portions. Two experiments have been designed to clarify the performance of the procedure, one to multicolored objects and another to objects of different surface characteristics. The results show that the mechanism of eliminating the remitted, non-polarized colored portions of light works very fine. Independent from its color, different color pigments seem to be suitable for measuring the color of the illumination. The intensity and also the polarization degree of the reflected light depend on the surface properties significantly. The results exhibit a high accuracy of measuring the color of the illumination for glossy and matt surfaces. Only strongly scattering surfaces account for a weak signal level of the difference image and a reduced accuracy. An embodiment is proposed to integrate the new method into digital cameras.

Paper Details

Date Published: 20 March 2008
PDF: 11 pages
Proc. SPIE 6817, Digital Photography IV, 68170E (20 March 2008); doi: 10.1117/12.766719
Show Author Affiliations
Gregor Fischer, Cologne Univ. for Applied Sciences (Germany)
Karin Kolbe, Cologne Univ. for Applied Sciences (Germany)
Matthias Sajjaa, Cologne Univ. for Applied Sciences (Germany)

Published in SPIE Proceedings Vol. 6817:
Digital Photography IV
Jeffrey M. DiCarlo; Brian G. Rodricks, Editor(s)

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