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Optical Engineering

Multispectral color image capture using a liquid crystal tunable filter
Author(s): Jon Yngve Hardeberg; Francis J. M. Schmitt; Hans Brettel
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Paper Abstract

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.

Paper Details

Date Published: 1 October 2002
PDF: 17 pages
Opt. Eng. 41(10) doi: 10.1117/1.1503346
Published in: Optical Engineering Volume 41, Issue 10
Show Author Affiliations
Jon Yngve Hardeberg, Gjovik Univ. College (Norway)
Francis J. M. Schmitt, Ecole Nationale Superieure des Telecommunications (France)
Hans Brettel, Ecole Nationale Superieure des Telecommunications (France)

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