Periodic novelty detections and outline enhancements optically processed with a photorefractive detector

Pierre Mathey; Pierre Jullien; Daniel Rytz

doi:10.1117/12.308929

22 May 1998 Periodic novelty detections and outline enhancements optically processed with a photorefractive detector

Pierre Mathey, Pierre Jullien, Daniel Rytz

Proceedings Volume 3490, Optics in Computing '98; (1998) https://doi.org/10.1117/12.308929
Event: Optics in Computing '98, 1998, Bruges, Belgium

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.

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Pierre Mathey, Pierre Jullien, and Daniel Rytz "Periodic novelty detections and outline enhancements optically processed with a photorefractive detector", Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); https://doi.org/10.1117/12.308929

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KEYWORDS

Crystals

Spatial light modulators

Ferroelectric materials

Cobalt

Optical filters

Adaptive optics

Laser crystals

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