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Spectral band selection and classifier design for a multispectral imaging laser radar

[+] Author Affiliations
Russell C. Hardie

University of Dayton, Department of Electrical and Computer Engineering, 300 College Park Avenue, Dayton, Ohio?45469-0226

Mohan Vaidyanathan, Paul F. McManamon

U.S. Air Force Wright Laboratory, Electro-Optics Sensor Technology Branch (WL/AAJT), Building 622, 3109 P Street, Wright-Patterson Air Force Base, Ohio?45433-7700

Opt. Eng. 37(3), 752-762 (Mar 01, 1998). doi:10.1117/1.601907
History: Received May 29, 1997; Revised Aug. 19, 1997; Accepted Aug. 21, 1997
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Abstract

A statistical spectral band selection procedure and classifiers for an active multispectral laser radar (LADAR) sensor are described. The sensor will operate in the 1 to 5 μm wavelength region. The algorithms proposed are tested using library reflectance spectra for some representative background materials. The material classes considered include both natural (vegetation and soil) and man-made (camouflage cloth and tar-asphalt). The analysis includes noise statistics due to Gaussian receiver noise and target induced speckle variations in the LADAR return signal intensity. The results of this analysis are then directly applied to an artificially generated spatial template of a scene consisting of these four material classes. The performance of four different classifier algorithms, which include a minimum distance classifier, a log-domain minimum distance classifier, a Bayes speckle-only classifier, and a Bayes speckle-Gaussian classifier, are evaluated. We show that the Bayesian classifier designed for speckle and Gaussian noise statistics outperforms the other classifiers. Our results also indicate that even when exact knowledge of the observation model is available, the classifier performance for speckled images can be poor unless the number of integrated speckle cells is large. © 1998 Society of Photo-Optical Instrumentation Engineers.

© 1998 Society of Photo-Optical Instrumentation Engineers

Citation

Russell C. Hardie ; Mohan Vaidyanathan and Paul F. McManamon
"Spectral band selection and classifier design for a multispectral imaging laser radar", Opt. Eng. 37(3), 752-762 (Mar 01, 1998). ; http://dx.doi.org/10.1117/1.601907


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