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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 10 — Oct. 1, 2010
  • pp: 2198–2207

Optimum sensors for color constancy in scenes illuminated by daylight

Sivalogeswaran Ratnasingam, Steve Collins, and Javier Hernández-Andrés  »View Author Affiliations


JOSA A, Vol. 27, Issue 10, pp. 2198-2207 (2010)
http://dx.doi.org/10.1364/JOSAA.27.002198


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Abstract

The apparent color of an object within a scene depends on the spectrum of the light illuminating the object. However, recording an object’s color independent of the illuminant spectrum is important in many machine vision applications. In this paper the performance of a blackbody-model-based color constancy algorithm that requires four sensors with different spectral responses is investigated under daylight illumination. In this investigation sensor noise was modeled as Gaussian noise, and the responses were quantized using different numbers of bits. A projection-based algorithm whose output is invariant to illuminant is investigated to improve the results that are obtained. The performance of both of these algorithms is then improved by optimizing the spectral sensitivities of the four sensors using freely available CIE standard daylight spectra and a set of lightness-normalized Munsell reflectance data. With the optimized sensors the performance of both algorithms is shown to be comparable to the human visual system. However, results obtained with measured daylight spectra show that the standard daylights may not be sufficiently representative of measured daylight for optimization with the standard daylight to lead to a reliable set of optimum sensor characteristics.

© 2010 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision
(330.1730) Vision, color, and visual optics : Colorimetry

ToC Category:
Machine Vision

History
Original Manuscript: February 10, 2010
Revised Manuscript: August 11, 2010
Manuscript Accepted: August 17, 2010
Published: September 20, 2010

Virtual Issues
Vol. 5, Iss. 14 Virtual Journal for Biomedical Optics

Citation
Sivalogeswaran Ratnasingam, Steve Collins, and Javier Hernández-Andrés, "Optimum sensors for color constancy in scenes illuminated by daylight," J. Opt. Soc. Am. A 27, 2198-2207 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-10-2198

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