Pattern recognition with an adaptive phase-input joint transform correlator

Victor H. Diaz-Ramirez; Vitaly Kober; Josue Alvarez-Borrego

doi:10.1117/12.678546

30 August 2006 Pattern recognition with an adaptive phase-input joint transform correlator

Victor H. Diaz-Ramirez, Vitaly Kober, Josue Alvarez-Borrego

Proceedings Volume 6311, Optical Information Systems IV; 631113 (2006) https://doi.org/10.1117/12.678546
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

An adaptive phase-input joint transform correlator for real-time pattern recognition is presented. A reference image for the correlator is generated with a new iterative algorithm based on synthetic discriminant functions. The obtained reference image contains the information needed to discriminate reliably a target against known false objects and a cluttered background. Calibration look-up tables of all used opto-electronic elements are included in the design of the adaptive phase-input joint transform correlator. The resulting joint input image for the correlator is a real-valued bipolar image, which cannot be directly displayed with a conventional amplitudeonly spatial light modulator. Commonly two optical correlations and post-processing are used. We utilize a phase-only spatial light modulator in the input plane. A new phase-only joint input image is obtained by a monotonic mapping the intensity to phase information. The phase-only image is easily introduced into an optical setup. In this case we need just one correlation and no post-processing. Experimental results are provided and compared with those obtained with computer simulations.

Citation Download Citation

Victor H. Diaz-Ramirez, Vitaly Kober, and Josue Alvarez-Borrego "Pattern recognition with an adaptive phase-input joint transform correlator", Proc. SPIE 6311, Optical Information Systems IV, 631113 (30 August 2006); https://doi.org/10.1117/12.678546

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KEYWORDS

Optical correlators

Joint transforms

Image filtering

Spatial light modulators

Computer simulations

Modulation

Phase shift keying

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