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Proceedings Paper

Median amplitude-compensated matched filter for optical pattern recognition
Author(s): Arturo Carnicer
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Paper Abstract

The aim of this communication is to study one possible way of avoiding the limitations associated with mathematical poles and low optical efficiency of the inverse filter. In order to increase the performance characteristics of the filter, phase- only and inverse amplitude information are combined in a similar way to amplitude-compensated matched filter. A threshold value determines the ratio of filter frequencies in phase state or in inverse state. The behaviour of signal-to-noise ratio, discrimination and optical efficiency as a function of this threshold have been analyzed by digital simulation. According to the study, the median of the power spectrum reference histogram is an adequate threshold for filter design. By taking this value, satisfactory results of signal-to-noise ratio and discrimination have been obtained. With reference to optical efficiency, a significant increase has been observed by comparing with inverse filter or amplitude- compensated matched filter.

Paper Details

Date Published: 26 July 1993
PDF: 2 pages
Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 198349 (26 July 1993); doi: 10.1117/12.2308572
Show Author Affiliations
Arturo Carnicer, Univ. de Barcelona (Spain)

Published in SPIE Proceedings Vol. 1983:
16th Congress of the International Commission for Optics: Optics as a Key to High Technology
Gyorgy Akos; Tivadar Lippenyi; Gabor Lupkovics; Andras Podmaniczky, Editor(s)

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