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25 October 1993 Chirp-encoded optical processor for pattern recognition
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We describe a joint transform correlator in which the reference signal and the input scene are placed in different input planes along the optical axis. We show that this system will focus the off-axis cross-correlation functions and the on-axis autocorrelation functions in different output planes. In a conventional joint transform correlator, these terms are produced in the same output plane. The effect of placing the input scene and the reference signal in different input planes is mathematically analyzed. Computer simulations, and experimental results are presented to illustrate the performance of this correlator. We show that for the nonlinear joint transform correlator, the higher order correlation terms are produced in different output planes.
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Qing Tang and Bahram Javidi "Chirp-encoded optical processor for pattern recognition", Proc. SPIE 1959, Optical Pattern Recognition IV, (25 October 1993);

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