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Proceedings Paper

The effect of exposure on MaxRGB color constancy
Author(s): Brian Funt; Lilong Shi
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Paper Abstract

The performance of the MaxRGB illumination-estimation method for color constancy and automatic white balancing has been reported in the literature as being mediocre at best; however, MaxRGB has usually been tested on images of only 8-bits per channel. The question arises as to whether the method itself is inadequate, or rather whether it has simply been tested on data of inadequate dynamic range. To address this question, a database of sets of exposure-bracketed images was created. The image sets include exposures ranging from very underexposed to slightly overexposed. The color of the scene illumination was determined by taking an extra image of the scene containing 4 Gretag Macbeth mini Colorcheckers placed at an angle to one another. MaxRGB was then run on the images of increasing exposure. The results clearly show that its performance drops dramatically when the 14-bit exposure range of the Nikon D700 camera is exceeded, thereby resulting in clipping of high values. For those images exposed such that no clipping occurs, the median error in MaxRGB's estimate of the color of the scene illumination is found to be relatively small.

Paper Details

Date Published: 17 February 2010
PDF: 7 pages
Proc. SPIE 7527, Human Vision and Electronic Imaging XV, 75270Y (17 February 2010); doi: 10.1117/12.845394
Show Author Affiliations
Brian Funt, Simon Fraser Univ. (Canada)
Lilong Shi, Simon Fraser Univ. (Canada)

Published in SPIE Proceedings Vol. 7527:
Human Vision and Electronic Imaging XV
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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