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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 29, Iss. 2 — Feb. 1, 2012
  • pp: A240–A246

Contrast edge colors under different natural illuminations

Juan Luis Nieves, Sérgio M. C. Nascimento, and Javier Romero  »View Author Affiliations

JOSA A, Vol. 29, Issue 2, pp. A240-A246 (2012)

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Essential to sensory processing in the human visual system is natural illumination, which can vary considerably not only across space but also along the day depending on the atmospheric conditions and the sun’s position in the sky. In this work, edges derived from the three postreceptoral Luminance, Red–Green, and Blue–Yellow signals were computed from hyperspectral images of natural scenes rendered with daylights of Correlated Color Temperatures (CCTs) from 2735 to 25,889 K; for low CCT, the same analysis was performed using Planckian illuminants up to 800 K. It was found that average luminance and chromatic edge contrasts were maximal for low correlated color temperatures and almost constants above 10,000 K. The magnitude of these contrast changes was, however, only about 2% across the tested daylights. Results suggest that the postreceptoral opponent and nonopponent color vision mechanisms produce almost constant responses for color edge detection under natural illumination.

© 2012 Optical Society of America

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

ToC Category:
Color in natural or complex scenes

Original Manuscript: September 1, 2011
Revised Manuscript: December 8, 2011
Manuscript Accepted: December 8, 2011
Published: January 27, 2012

Virtual Issues
Vol. 7, Iss. 4 Virtual Journal for Biomedical Optics

Juan Luis Nieves, Sérgio M. C. Nascimento, and Javier Romero, "Contrast edge colors under different natural illuminations," J. Opt. Soc. Am. A 29, A240-A246 (2012)

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