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Title: Pattern detection using a modified composite filter with nonlinear joint transform correlator
Author: Vallmitjana i Rico, Santiago
Juvells Prades, Ignacio
Carnicer González, Arturo
Campos Coloma, Juan
Keywords: Reconeixement òptic de formes
Òptica de Fourier
Optical pattern recognition
Fourier optics
Issue Date: 1991
Publisher: Society of Photo-Optical Instrumentation Engineers (SPIE)
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.
Note: Reproducció del document publicat a:
It is part of: Proceedings of SPIE, 1991, vol. 1564, p. 266-274
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ISSN: 0277-786X
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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