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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

  • Vol. 21, Iss. 10 — Oct. 1, 2004
  • pp: 1825–1833

Estimating visible through near-infrared spectral reflectance from a sensor radiance spectrum

Kartik Chandra and Glenn Healey  »View Author Affiliations


JOSA A, Vol. 21, Issue 10, pp. 1825-1833 (2004)
http://dx.doi.org/10.1364/JOSAA.21.001825


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Abstract

We show that surface spectral reflectance can be separated from illumination effects in visible through near-infrared (350 nm–1740 nm) hyperspectral data by using only the information in a single radiance spectrum. The separation method exploits the fact that reflectance and illumination spectra typically lie in distinct subspaces. We present a comparison of a linear and a nonlinear algorithm for the separation. These algorithms compute an estimate of the spectral reflectance up to a scaling factor. In addition, we present an iterative method that is used to determine the starting point for the nonlinear algorithm. We also develop a method for selecting the dimension of the reflectance and illumination subspaces that is appropriate for material identification applications. The accuracy of the separation methods is quantified by application to noisy visible through near-infrared spectral data with a database of 107 materials and 3000 illumination spectra. The utility of the separation method for material identification is demonstrated with the same database. The results show that accurate reflectance recovery and material identification is possible by use of visible through near-infrared spectral data over the outdoor environmental conditions represented in this data set.

© 2004 Optical Society of America

OCIS Codes
(150.0150) Machine vision : Machine vision
(150.2950) Machine vision : Illumination

History
Original Manuscript: February 26, 2004
Revised Manuscript: April 23, 2004
Manuscript Accepted: April 23, 2004
Published: October 1, 2004

Citation
Kartik Chandra and Glenn Healey, "Estimating visible through near-infrared spectral reflectance from a sensor radiance spectrum," J. Opt. Soc. Am. A 21, 1825-1833 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-10-1825

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