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Proceedings Paper

Optimal classification of standoff bioaerosol measurements using evolutionary algorithms
Author(s): Ragnhild Nyhavn; Hans J. F. Moen; Øystein Farsund; Gunnar Rustad
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Paper Abstract

Early warning systems based on standoff detection of biological aerosols require real-time signal processing of a large quantity of high-dimensional data, challenging the systems efficiency in terms of both computational complexity and classification accuracy. Hence, optimal feature selection is essential in forming a stable and efficient classification system. This involves finding optimal signal processing parameters, characteristic spectral frequencies and other data transformations in large magnitude variable space, stating the need for an efficient and smart search algorithm. Evolutionary algorithms are population-based optimization methods inspired by Darwinian evolutionary theory. These methods focus on application of selection, mutation and recombination on a population of competing solutions and optimize this set by evolving the population of solutions for each generation. We have employed genetic algorithms in the search for optimal feature selection and signal processing parameters for classification of biological agents. The experimental data were achieved with a spectrally resolved lidar based on ultraviolet laser induced fluorescence, and included several releases of 5 common simulants. The genetic algorithm outperform benchmark methods involving analytic, sequential and random methods like support vector machines, Fisher's linear discriminant and principal component analysis, with significantly improved classification accuracy compared to the best classical method.

Paper Details

Date Published: 3 June 2011
PDF: 13 pages
Proc. SPIE 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, 801806 (3 June 2011); doi: 10.1117/12.883919
Show Author Affiliations
Ragnhild Nyhavn, Norwegian Defence Research Establishment (Norway)
Hans J. F. Moen, Norwegian Defence Research Establishment (Norway)
Øystein Farsund, Norwegian Defence Research Establishment (Norway)
Gunnar Rustad, Norwegian Defence Research Establishment (Norway)

Published in SPIE Proceedings Vol. 8018:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII
Augustus W. Fountain III; Patrick J. Gardner, Editor(s)

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