Semiconductor Physics, Quantum Electronics & Optoelectronics. 2005. V. 8, N 2. P. 075-080.
https://doi.org/10.15407/spqeo8.02.075

Method for replacing objects in 4F-correlator: testing
P.V. Yezhova, A.V. Kuzmenkob, T.N. Smirnovaa A.A. Ivanovskyyc

aInstitute of Physics, NAS of Ukraine, 46, prospect Nauky, 03028 Kyiv, Ukraine Phone: (38 044) 525 5072, e-mail: yezhov@iop.kiev.ua
bInternational Center “Institute of Applied Optics”, NAS of Ukraine, 10G, Kudryavskaya str., 04053 Kyiv, Ukraine
c“Specialized Enterprize “Holography”, 34/1, Grushevskogo str., office 29, 01021 Kyiv, Ukraine

Abstract. The method of pattern recognition based on replacement of object images incoming to the correlator by object-dependent synthesized phase objects calculated using the iterative Fourier-transform algorithm was developed by us earlier. In this work, we performed experimental testing the above method by using an optical-digital 4Fcorrelator. Synthesized phase objects were inputed into the correlator through the spatial light modulator LC2002. Holographic matched filters were recorded using selfdeveloping photopolymers PPC-488. For two test objects, we obtained unified (δ-like) correlation signals with the signal-to-noise ratio reaching 24 dB, while the diffraction efficiency of these filters was up to 30%.

Keywords: pattern recognition, hybrid optical-digital 4F-correlator, synthesized phase object, iterative Fourier-transform algorithm.

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