Maximum color separation in illuminant estimation

Xiaoyun Jiang; Noboru Ohta

doi:10.1117/12.527445

18 December 2003 Maximum color separation in illuminant estimation

Xiaoyun Jiang, Noboru Ohta

Proceedings Volume 5293, Color Imaging IX: Processing, Hardcopy, and Applications; (2003) https://doi.org/10.1117/12.527445
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

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.

Citation Download Citation

Xiaoyun Jiang and Noboru Ohta "Maximum color separation in illuminant estimation", Proc. SPIE 5293, Color Imaging IX: Processing, Hardcopy, and Applications, (18 December 2003); https://doi.org/10.1117/12.527445

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KEYWORDS

RGB color model

Error analysis

Visual system

Analytical research

Black bodies

Sensors

Color imaging

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