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Opt Express ; 19(3): 2530-6, 2011 Jan 31.
Artículo en Inglés | MEDLINE | ID: mdl-21369072

RESUMEN

Millimeter wave imaging is finding rapid adoption in security applications such as the detection of objects concealed under clothing. A passive imaging system can be realized as a stand-off type sensor that can operate in open spaces, both indoors and outdoors. In this paper, we address real-time outdoor concealed-object detection and segmentation with a radiometric imaging system operating in the W-band. The imaging system is equipped with a dielectric lens and a receiver array operating at around 94 GHz. Images are analyzed by multilevel segmentation to identify a concealed object. Each level of segmentation comprises vector quantization, expectation-maximization, and Bayesian decision making to cluster pixels on the basis of a Gaussian mixture model. In addition, we describe a faster process that adopts only vector quantization for the first level segmentation. Experiments confirm that the proposed methods provide fast and reliable detection and segmentation for a moving human subject carrying a concealed gun.


Asunto(s)
Monitoreo del Ambiente/instrumentación , Aumento de la Imagen/instrumentación , Interpretación de Imagen Asistida por Computador/instrumentación , Microondas , Sistemas de Computación , Diseño de Equipo , Análisis de Falla de Equipo
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