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Proceedings Paper

Maximum color separation in illuminant estimation
Author(s): Xiaoyun Jiang; Noboru Ohta
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Paper Abstract

The phenomenon has long been noticed that colors are more vivid under white illuminants. A new illuminant estimation method, maximum color separation, is based on the assumption that image gamut reaches its maximum when under white illuminants. It was also found out that when the image gamut reaches its maximum through the diagonal transformation in (r, g) space, the centroid of the gamut locates at (1/3, 1/3), which makes the method to have strong connection with the most widely used gray world method. In this paper, the above consequence is proven to be true when the representation of gamut is extended from triangle to polygon. In addition, the basic assumption is modified for application use. One modification is to do maximum color separation at each lightness level, and another modification is the adjustment of the reference illuminant. The method is proved to be an effect illuminant estimation method through testing on real images.

Paper Details

Date Published: 18 December 2003
PDF: 9 pages
Proc. SPIE 5293, Color Imaging IX: Processing, Hardcopy, and Applications, (18 December 2003); doi: 10.1117/12.527445
Show Author Affiliations
Xiaoyun Jiang, Qualcomm, Inc. (United States)
Noboru Ohta, Rochester Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5293:
Color Imaging IX: Processing, Hardcopy, and Applications
Reiner Eschbach; Gabriel G. Marcu, Editor(s)

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