Optical implementation of a photorefractive joint transform correlator with wavelet filters

We have investigated a real-time photorefractive joint transform correlator (JTC) with a bank of wavelet filters. In the experimental set-up, a photor efractive crystal BSO has been used as the dynamic holographic medium and a bank of discrete wavelet functions, derived from a mother Mexican-hat wave let have been selected to achieve band-pass operations in the JTC Fourier d omain. With the proper dilation factors, shaper correlation peaks, higher d iscrimination ability and higher noise robustness have been obtained. Exper imental results and analysis are presented. (C) 2000 Elsevier Science B.V. All rights reserved.