11 January 2005 Optoelectronic hybrid joint transform correlator based on power spectrum subtracting and exponential filtering
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Abstract
A new kind of optoelectronic hybrid joint transform correlator is proposed in this paper, it fulfills edge enhancement preprocessing for the input images in the spatial field and subtraction modifying and exponential filtering for the joint power spectrum in frequency field with electronic method. The influence of different edge enhancement operators (Log, Roberts, Sobel and Prewitt) and exponential parameters value on correlation result is studied. When the values of two exponential parameters are matched, the correlator can produce excellent correlation output. Computer simulation results show that the proposed correlator can eliminate the strong zero-order component in the output plane, enhance and sharpen the auto-correlation peak and restrain cross-correlations between each input targets. So the correlation recognition ability of this hybrid system is quite better than the classical joint transform correlator, it can be used for multi-object recognition.
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Hongxia Wang, Junfa He, Zhaoxuan Sheng, "Optoelectronic hybrid joint transform correlator based on power spectrum subtracting and exponential filtering", Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); doi: 10.1117/12.574410; https://doi.org/10.1117/12.574410
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