27 March 1997 Optical correlator architecture for the identification of many patterns with a multiplexed matched filter
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Abstract
We have investigated a novel coherent optical correlator architecture for both recognizing and distinguishing between a plurality of patterns using only a single fixed binary phase-only matched filter, referred to here as a multiplexed filter. In order to utilize the filer space effectively we have introduced a novel spread spectrum technique for coding the input patterns, so called overlay encoding, suing a random high frequency binary phase-only mask. We have shown how standard optimization techniques can be used to design a multiplexed filter, which is capable of producing a set of codes in the output plane when the corresponding elements of a set of input patterns are presented in the input plane. The theoretical analysis has been verified experimentally using commercially available ferroelectric liquid crystal spatial light modulators.
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N. Manivannan, N. Manivannan, Mark A. A. Neil, Mark A. A. Neil, Edward G. S. Paige, Edward G. S. Paige, } "Optical correlator architecture for the identification of many patterns with a multiplexed matched filter", Proc. SPIE 3073, Optical Pattern Recognition VIII, (27 March 1997); doi: 10.1117/12.270400; https://doi.org/10.1117/12.270400
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