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Proceedings Paper

Nonlinear baseband filters for optical pattern recognition
Author(s): Bahram Javidi; Carol Ruiz; Jack Ruiz
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Paper Abstract

A nonlinear filter based image correlator is investigated. The linear filter is expressed as the real part of the conventional matched filter. This baseband function contains the amplitude and phase of the Fourier transform of the reference signal. The real baséband filter function is then applied to a nonlinear device to produce the nonlinear filter function. Analytical expressions for the nonlinear filter are provided. The effects of the nonlinear transfer characteristics on the correlation signals at the output plane are investigated. The correlation signals are determined in terms of the nonlinear characteristics used to transform the filter. We show that the nonlinear filter results is a sum of infinite harmonic terms. Each harmonic term is envelope modulated due to the nonlinear characteristics of the device, and phase modulated by m times the phase modulation of the linear filter function.

Paper Details

Date Published: 1 May 1990
PDF: 7 pages
Proc. SPIE 1211, Computer and Optically Formed Holographic Optics, (1 May 1990); doi: 10.1117/12.17950
Show Author Affiliations
Bahram Javidi, Univ. of Connecticut (United States)
Carol Ruiz, Univ. of Connecticut (United States)
Jack Ruiz, Univ. of Connecticut (United States)


Published in SPIE Proceedings Vol. 1211:
Computer and Optically Formed Holographic Optics
Ivan Cindrich; Sing H. Lee, Editor(s)

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