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Optical Engineering

Image restoration of dispersion-degraded images from a liquid-crystal beam steerer
Author(s): Ronald J. Broessel; Vincent G. Dominic; Russell C. Hardie
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Paper Abstract

Liquid-crystal arrays represents one of the first practical technologies capable of steering light by electronic control only. We use such a device to steer the field of view of a broadband imaging sensor. Unfortunately, dispersion degrades the image quality by smearing out details in the image and by introducing multiple diffraction orders (echoes) at the detector plane. We present a method to compensate for these unwanted effects and thus restore the broadband images obtained with the beam steerer. We use the beam-propagation method to find the wavelength-dependent impulse response, from which we determine the appropriate Wiener filter. When training data are available, we improve the filter with the adaptive least mean square algorithm. We present restored images that demonstrate the capabilities of this technique.

Paper Details

Date Published: 1 November 1995
PDF: 8 pages
Opt. Eng. 34(11) doi: 10.1117/12.213519
Published in: Optical Engineering Volume 34, Issue 11
Show Author Affiliations
Ronald J. Broessel, Univ. of Dayton (United States)
Vincent G. Dominic, Univ. of Dayton (United States)
Russell C. Hardie, Univ. of Dayton (United States)

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