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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 27 — Sep. 20, 2005
  • pp: 5688–5695

Designing a practical system for spectral imaging of skylight

Miguel A. López-Álvarez, Javier Hernández-Andrés, Javier Romero, and Raymond L. Lee, Jr.  »View Author Affiliations


Applied Optics, Vol. 44, Issue 27, pp. 5688-5695 (2005)
http://dx.doi.org/10.1364/AO.44.005688


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Abstract

In earlier work [ J. Opt. Soc. Am. A 21, 13– 23 ( 2004)], we showed that a combination of linear models and optimum Gaussian sensors obtained by an exhaustive search can recover daylight spectra reliably from broadband sensor data. Thus our algorithm and sensors could be used to design an accurate, relatively inexpensive system for spectral imaging of daylight. Here we improve our simulation of the multispectral system by (1) considering the different kinds of noise inherent in electronic devices such as change-coupled devices (CCDs) or complementary metal-oxide semiconductors (CMOS) and (2) extending our research to a different kind of natural illumination, skylight. Because exhaustive searches are expensive computationally, here we switch to a simulated annealing algorithm to define the optimum sensors for recovering skylight spectra. The annealing algorithm requires us to minimize a single cost function, and so we develop one that calculates both the spectral and colorimetric similarity of any pair of skylight spectra. We show that the simulated annealing algorithm yields results similar to the exhaustive search but with much less computational effort. Our technique lets us study the properties of optimum sensors in the presence of noise, one side effect of which is that adding more sensors may not improve the spectral recovery.

© 2005 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(040.0040) Detectors : Detectors
(150.0150) Machine vision : Machine vision
(150.2950) Machine vision : Illumination

History
Original Manuscript: December 21, 2004
Revised Manuscript: April 27, 2005
Manuscript Accepted: May 3, 2005
Published: September 20, 2005

Citation
Miguel A. López-Álvarez, Javier Hernández-Andrés, Javier Romero, and Raymond L. Lee, "Designing a practical system for spectral imaging of skylight," Appl. Opt. 44, 5688-5695 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-27-5688

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