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

Renu Tripathi; Kehar Singh

doi:10.1117/12.347983

28 April 1999 Photorefractive correlators for optical pattern recognition and object motion measurement: some improved techniques

Renu Tripathi, Kehar Singh

Author Affiliations +

Proceedings Volume 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98; (1999) https://doi.org/10.1117/12.347983
Event: International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, 1998, New Delhi, India

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.

Citation Download Citation

Renu Tripathi and Kehar Singh "Photorefractive correlators for optical pattern recognition and object motion measurement: some improved techniques", Proc. SPIE 3666, International Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '98, (28 April 1999); https://doi.org/10.1117/12.347983

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