22 May 1998 Periodic novelty detections and outline enhancements optically processed with a photorefractive detector
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pierre Mathey, Pierre Mathey, Pierre Jullien, Pierre Jullien, Daniel Rytz, Daniel Rytz, } "Periodic novelty detections and outline enhancements optically processed with a photorefractive detector", Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); doi: 10.1117/12.308929; https://doi.org/10.1117/12.308929
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