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Pattern detection using a modified composite filter with nonlinear joint transform correlator
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A simple method for optical implementation of a composite filter in a joint transform correlator is presented. A composite filter in object space is a real function, but by adding an appropriate constant value, only positive values are obtained. As a drawback, the bias introduced decreases the relative height of the correlation peaks in the recognition process. Non-linear effects in a joint transform correlator are used to increase discrimination by using positive composite filters. Digital simulation and optical implementation of the process has been carried out, achieving the non-linearities by means of saturation effects on the intensity detection process.
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VALLMITJANA I RICO, Santiago, et al. Pattern detection using a modified composite filter with nonlinear joint transform correlator. Proceedings of SPIE. 1991. Vol. 1564, num. 266-274. ISSN 0277-786X. [consulted: 11 of October of 2026]. Available at: https://hdl.handle.net/2445/170719