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31 March 2000 Efficient joint transform processor
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An efficient joint transform processor, called the phase- encoded fringe-adjusted joint transfer correlator (PFJTC) is proposed which employs phase encoding and nonlinear Fourier plane apodization for optimizing the correlation performance. For input scenes involving multiple identical targets, existing JTCs require multi-step on-line processing to eliminate the false alarms and other artifacts. The proposed PFJTC eliminates the possibility of false target detection by eradicating the false correlation peaks, and alleviates the effects of noise and other artifacts, in just one step thus ensuring higher processing speed. The phase encoding operation and the Fourier plane apodization does not have any detrimental effect on the processing speed. This technique ensures better utilization of space- bandwidth-product by using separate input and reference planes and by yielding only one peak per target instead of a pair of peaks produced by alternate JTCs. An all-optical implementation for the PFJTC technique is proposed and computer simulation results are presented.
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Mohammad S. Alam "Efficient joint transform processor", Proc. SPIE 4043, Optical Pattern Recognition XI, (31 March 2000);

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