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Multispectral color image capture using a liquid crystal tunable filter

[+] Author Affiliations
Jon Y. Hardeberg

Gjøvik University College, P.O. Box 191, N-2802?Gjøvik, Norway

SINTEF Electronics and Cybernetics, Trondheim, Norway E-mail: jon.hardeberg@hig.no, jon@hardeberg.com

Francis Schmitt, Hans Brettel

E´cole Nationale Supe´rieure des Te´le´communications, Signal and Image Processing Department, CNRS URA 820, 46 rue Barrault, F-75634?Paris Cedex 13, France

Opt. Eng. 41(10), 2532-2548 (Oct 01, 2002). doi:10.1117/1.1503346
History: Received June 11, 2001; Revised Mar. 21, 2002; Accepted Mar. 22, 2002; Online September 20, 2002
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We describe the experimental setup of a multispectral color image acquisition system consisting of a professional monochrome CCD camera and a tunable filter in which the spectral transmittance can be controlled electronically. We perform a spectral characterization of the acquisition system taking into account the acquisition noise. To convert the camera output signals to device-independent color data, two main approaches are proposed and evaluated. One consists in applying regression methods to convert from the K camera outputs to a device-independent color space such as CIEXYZ or CIELAB. Another method is based on a spectral model of the acquisition system. By inverting the model using a principal eigenvector approach, we estimate the spectral reflectance of each pixel of the imaged surface. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Jon Y. Hardeberg ; Francis Schmitt and Hans Brettel
"Multispectral color image capture using a liquid crystal tunable filter", Opt. Eng. 41(10), 2532-2548 (Oct 01, 2002). ; http://dx.doi.org/10.1117/1.1503346


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