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Proceedings Paper

Noise-tolerant filtering schemes with joint transform correlators
Author(s): Hanni Inbar; Emanuel Marom
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Paper Abstract

Conventional joint transform correlator (JTC) configurations are optimal with respect to noise tolerance only for input scenes embedded in white noise. Different processing should be devised in the presence of colored noise, taking into account the spectral characteristics of the noise. We hereby propose general, simple and powerful means, extending the capabilities of conventional JTC systems to enable Wiener filtering (WF) as well as parametric Wiener filtering (PWF) for patterns corrupted by colored noise. Noise is explicitly accommodated for by performing mathematical operations in between the two cycles of the JTC operation. The suggested JTC-based hybrid optoelectronic implementations do not necessarily rely on a-priori knowledge of the noise power spectral density, but rather determine an estimate of this distribution in an adaptive manner, based on measurable power spectra information. Such implementations provide great flexibility and real-time adaptivity to colored noise, resulting in improved correlation performance. Mathematical analysis and computer simulations are presented, whereby noise processes with different spectral characteristics and intensities are considered.

Paper Details

Date Published: 6 June 1995
PDF: 5 pages
Proc. SPIE 2426, 9th Meeting on Optical Engineering in Israel, (6 June 1995); doi: 10.1117/12.211197
Show Author Affiliations
Hanni Inbar, Tel Aviv Univ. (Israel)
Emanuel Marom, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 2426:
9th Meeting on Optical Engineering in Israel
Itzhak Shladov; Yitzhak Wiessman; Natan Kopeika, Editor(s)

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