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Proceedings Paper

Compact portable optical correlator with binary ferroelectric SLMs and optimum filters for disjoint noise applied to varying illumination conditions
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Paper Abstract

A compact optical correlator based on binary liquid crystal spatial light modulators has been built. The correlator has a 21 X 28 cm2 footprint and can process 256 X 256 pixel images at a maximum frame rate of 220 Hz. The system is insensitive to transportation and can be used both in VLC and JTC configuration. It can process live images from an external camera as well as images from computer memory. Variations of illumination conditions can change the graylevels and perceptible details of a target considerably. When this is the case, classical filters like phase only and optimal trade-off fail to detect the target. An improvement of the results can be achieved by using the optimum generalized filter. In most cases, the contour of the target remains more or less the same even if the graylevels are fluctuating. We show that by edge-enhancing and binarizing the input images used together with the optimum generalized filter we can achieve comparable results as compared to using grayscale images.

Paper Details

Date Published: 27 March 1997
PDF: 9 pages
Proc. SPIE 3073, Optical Pattern Recognition VIII, (27 March 1997); doi: 10.1117/12.270363
Show Author Affiliations
Henrik Sjoeberg, Royal Institute of Technology (Sweden)
Lech Wosinski, Royal Institute of Technology (Sweden)
Bertrand Noharet, Royal Institute of Technology (Sweden)


Published in SPIE Proceedings Vol. 3073:
Optical Pattern Recognition VIII
David P. Casasent; Tien-Hsin Chao, Editor(s)

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