2026-04-17T06:12:20Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1707192025-11-19T11:00:01Zcom_2072_1057col_2072_478821col_2072_478917

00925njm 22002777a 4500 dc Vallmitjana i Rico, Santiago author Juvells Prades, Ignacio author Carnicer González, Arturo author Campos Coloma, Juan author 2020-09-22T11:30:56Z 2020-09-22T11:30:56Z 1991 2020-09-22T11:30:56Z 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. Reconeixement òptic de formes Òptica de Fourier Optical pattern recognition Fourier optics Pattern detection using a modified composite filter with nonlinear joint transform correlator