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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 12 — Dec. 1, 2008

Evaluation and unification of some methods for estimating reflectance spectra from RGB images

Ville Heikkinen, Reiner Lenz, Tuija Jetsu, Jussi Parkkinen, Markku Hauta-Kasari, and Timo Jääskeläinen  »View Author Affiliations


JOSA A, Vol. 25, Issue 10, pp. 2444-2458 (2008)
http://dx.doi.org/10.1364/JOSAA.25.002444


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Abstract

The problem of estimating spectral reflectances from the responses of a digital camera has received considerable attention recently. This problem can be cast as a regularized regression problem or as a statistical inversion problem. We discuss some previously suggested estimation methods based on critically undersampled RGB measurements and describe some relations between them. We concentrate mainly on those models that are using a priori information in the form of high-resolution measurements. We use the “kernel machine” framework in our evaluations and concentrate on the use of multiple illuminations and on the investigation of the performance of global and locally adapted estimation methods. We also introduce a nonlinear transformation of reflectance values to ensure that the estimated reflection spectra fulfill physically motivated boundary conditions. The reported experimental results are derived from measured and simulated camera responses from the Munsell Matte, NCS, and Pantone data sets.

© 2008 Optical Society of America

OCIS Codes
(100.3010) Image processing : Image reconstruction techniques
(100.3190) Image processing : Inverse problems
(150.0150) Machine vision : Machine vision
(330.1710) Vision, color, and visual optics : Color, measurement

ToC Category:
Image Processing

History
Original Manuscript: February 12, 2008
Revised Manuscript: May 29, 2008
Manuscript Accepted: July 18, 2008
Published: September 11, 2008

Virtual Issues
Vol. 3, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Ville Heikkinen, Reiner Lenz, Tuija Jetsu, Jussi Parkkinen, Markku Hauta-Kasari, and Timo Jääskeläinen, "Evaluation and unification of some methods for estimating reflectance spectra from RGB images," J. Opt. Soc. Am. A 25, 2444-2458 (2008)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-25-10-2444

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