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Proceedings Paper

Pattern detection using a modified composite filter with nonlinear joint transform correlator
Author(s): Santiago Vallmitjana; Ignacio Prades Juvells; Arturo Carnicer; Juan Carlos Campos
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Paper 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.

Paper Details

Date Published: 1 November 1991
PDF: 9 pages
Proc. SPIE 1564, Optical Information Processing Systems and Architectures III, (1 November 1991); doi: 10.1117/12.49717
Show Author Affiliations
Santiago Vallmitjana, Univ. de Barcelona (Spain)
Ignacio Prades Juvells, Univ. de Barcelona (Spain)
Arturo Carnicer, Univ. de Barcelona (Spain)
Juan Carlos Campos, Univ. de Barcelona (Spain)

Published in SPIE Proceedings Vol. 1564:
Optical Information Processing Systems and Architectures III
Bahram Javidi, Editor(s)

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