1 November 1991 Pattern detection using a modified composite filter with nonlinear joint transform correlator
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Santiago Vallmitjana, Ignacio Prades Juvells, Arturo Carnicer, 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); doi: 10.1117/12.49717; https://doi.org/10.1117/12.49717
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