Pattern detection using a modified composite filter with nonlinear joint transform correlator

Santiago Vallmitjana; Ignacio Prades Juvells; Arturo Carnicer; Juan Carlos Campos

doi:10.1117/12.49717

1 November 1991 Pattern detection using a modified composite filter with nonlinear joint transform correlator

Santiago Vallmitjana, Ignacio Prades Juvells, Arturo Carnicer, Juan Carlos Campos

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Proceedings Volume 1564, Optical Information Processing Systems and Architectures III; (1991) https://doi.org/10.1117/12.49717
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

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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Santiago Vallmitjana, Ignacio Prades Juvells, Arturo Carnicer, and Juan Carlos Campos "Pattern detection using a modified composite filter with nonlinear joint transform correlator", Proc. SPIE 1564, Optical Information Processing Systems and Architectures III, (1 November 1991); https://doi.org/10.1117/12.49717

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