Accuracy of the output peak localization in two-dimensional matched filtering

Katarzyna Chalasinska-Macukow

doi:10.1117/12.57187

1 August 1991 Accuracy of the output peak localization in two-dimensional matched filtering

Katarzyna Chalasinska-Macukow

Proceedings Volume 1391, Laser Technology III; (1991) https://doi.org/10.1117/12.57187
Event: Laser Technology III, 1990, Szczecin, Poland

Abstract

The niatched filter has been developed historically as an one—dimensional detection filter for various communication systems1'2'3. It is the optimal filter for maximizing the signal-to-'noise ratio (SNR) . The concept of filtering in two dimensions has been introduced into two—dimensional linear systems as a simple extension of one-dimensional linear filter theory. Optical implementation of a matched filtering was a resuit of the development of the coherent light techniques and holography . In the past few years several correlation filters have been proposed. However, in many applications not only SNR, but also output peak sharpness, peak location, light efficiency, discriminability, and distortion invariance are very important filter parameters. A lot of problems related with optical pattern recognition may be reduced to detection and localization of search target. Various modifications of classical matched filtering are suggested in order to improve detection quality. All of them provide output peak sharpness minimalization. The sharper the correlation peak, the better location accuracy. Recently there are three basic realizations of the two dimensional correlation function in optics: - matched filtering including classical matched filtering (CMF), gradient filters (GF) , phase—only matched filtering (POF) , nonlinear matched filtering (NMF) , inverse filtering (IF) etc., - matched filtering with preprocessing, — joint transform correlator and its nonlinear version. In the present paper various modifications related to improvement of detection quality of the optical correlation methods mentioned above are presented and the output peak sharpness measured according to the peak-to--correlation energy (PCE) criterion is discussed.

Citation Download Citation

Katarzyna Chalasinska-Macukow "Accuracy of the output peak localization in two-dimensional matched filtering", Proc. SPIE 1391, Laser Technology III, (1 August 1991); https://doi.org/10.1117/12.57187

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KEYWORDS

Nonlinear filtering

Optical filters

Electronic filtering

Phase only filters

Linear filtering

Fourier transforms

Optical correlators

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