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Proceedings Paper

Periodic novelty detections and outline enhancements optically processed with a photorefractive detector
Author(s): Pierre Mathey; Pierre Jullien; Daniel Rytz
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Paper Abstract

A compact optical novelty filter based on two-wave mixing in a non-linear photorefractive crystal is implemented. The performances of the crystal, a cobalt doped barium titanate (BaTiO3:Co), in terms of depletion efficiency and response time are investigated. It is shown that the spatial light modulator involved in the system causes a drop of the wave-mixing. The system capability to detect cyclic new events, to track motions and to enhance the edges is demonstrated. In the case of a cyclic novelty detection, the cut-off frequency of the system is measured for several incident intensities. The outline characteristics of a moving object are studied versus its velocity and for a set of incident intensities and show, for the first time to our knowledge, to be in good agreement with the theoretical predictions.

Paper Details

Date Published: 22 May 1998
PDF: 4 pages
Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); doi: 10.1117/12.308929
Show Author Affiliations
Pierre Mathey, Univ. de Bourgogne (France)
Pierre Jullien, Univ. de Bourgogne (France)
Daniel Rytz, Forschungsinstitut fuer Mineralische und Metallische Werkstoffe/Edelmetalle GmbH (Germany)

Published in SPIE Proceedings Vol. 3490:
Optics in Computing '98
Pierre H. Chavel; David A. B. Miller; Hugo Thienpont, Editor(s)

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