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Proceedings Paper

Photorefractive correlators for optical pattern recognition and object motion measurement: some improved techniques
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Paper Abstract

This paper reports the outcome of research studies carried out by us in the area of Optical Pattern Recognition. We describe experimental realization of two kinds of all-optical nonlinear photorefractive (PR) joint transform correlators. One method uses a controllable beam-fanning nonlinearity and the other uses an incoherent erasure beam in PR wave-mixing. An experimental technique has been demonstrated to achieve high pattern discrimination using a bank of wavelet filters. Correlation technique has further been extended to real-time object motion measurement.

Paper Details

Date Published: 28 April 1999
PDF: 8 pages
Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); doi: 10.1117/12.347983
Show Author Affiliations
Renu Tripathi, Indian Institute of Technology/Delhi (India)
Kehar Singh, Indian Institute of Technology/Delhi (India)


Published in SPIE Proceedings Vol. 3666:
International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98
Anurag Sharma; Banshi Dhar Gupta; Ajoy K. Ghatak, Editor(s)

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