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6 March 2002 New type of compact optical correlator with noise resistance
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The new type of compact optical correlator, a real-time pattern recognition system, has been developed in our laboratory, which is designed by means of the shortened optical architecture and the spatial folded architecture. When Vander Lugt. Correlator is needed, we may make full use of the whole system; on the other hand, we can take advantage of the upper layer in the folded configuration system if the compact optical correlator is only used as joint transform correlator. The architecture of the optical correlator is carefully designed and fabricated, mainly including the design of two FT lenses, the making of illumination source and the choice of SLM. So the hybrid system possesses such good performances as high-speed information processing, vibration strength and small bulk. In this paper, we emphasize the application of the correlator as joint transform correlator. Input joint image is preprocessed using Roberts operator. In the Fourier plane, the differential operation is applied to the joint power spectrum (JPS). Compared with the classical joint transform correlator, the new joint transform correlator (NJTC) removes the dc component of JPS, yields sharp correlation peaks and offers high detection efficiency and discrimination ability. Meanwhile, noise-resistance is greatly enhanced in NJTC. Preliminary results are shown by computer simulations.
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Yongjie Hao, Wenyao Liu, Shuo Lu, Jintao Wang, and Yu Zhang "New type of compact optical correlator with noise resistance", Proc. SPIE 4734, Optical Pattern Recognition XIII, (6 March 2002);

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