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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, JUVELLS PRADES, Ignacio, CARNICER GONZÁLEZ, Arturo, CAMPOS COLOMA, Juan. Pattern detection using a modified composite filter with nonlinear joint transform correlator. _Proceedings of SPIE_. 1991. Vol. 1564, núm. 266-274. [consulta: 1 de febrer de 2026]. ISSN: 0277-786X. [Disponible a: https://hdl.handle.net/2445/170719]

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