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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 27, Iss. 2 — Feb. 1, 2010
  • pp: 286–294

Study of the photodetector characteristics of a camera for color constancy in natural scenes

Sivalogeswaran Ratnasingam and Steve Collins  »View Author Affiliations

JOSA A, Vol. 27, Issue 2, pp. 286-294 (2010)

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An algorithm is described to extract two features that represent the chromaticity of a surface and that are independent of both the intensity and correlated color temperature of the daylight illuminating a scene. For mathematical convenience this algorithm is derived using the assumptions that each photodetector responds to a single wavelength and that the spectrum of the illumination source can be represented by a blackbody spectrum. Neither of these assumptions will be valid in a real application. A new method is proposed to determine the effect of violating these assumptions. The conclusion reached is that two features can be obtained that are effectively independent of the daylight illuminant if photodetectors with a spectral response whose full width at half maximum is 80 nm or less are used.

© 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
(150.1135) Machine vision : Algorithms
(150.6044) Machine vision : Smart cameras

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: August 5, 2009
Revised Manuscript: December 16, 2009
Manuscript Accepted: December 21, 2009
Published: January 25, 2010

Virtual Issues
Vol. 5, Iss. 4 Virtual Journal for Biomedical Optics

Sivalogeswaran Ratnasingam and Steve Collins, "Study of the photodetector characteristics of a camera for color constancy in natural scenes," J. Opt. Soc. Am. A 27, 286-294 (2010)

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