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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 3 — Jan. 31, 2011
  • pp: 2530–2536

Real-time outdoor concealed-object detection with passive millimeter wave imaging

Seokwon Yeom, Dong-Su Lee, Jung-Young Son, Min-Kyoo Jung, YuShin Jang, Sang-Won Jung, and Seok-Jae Lee  »View Author Affiliations

Optics Express, Vol. 19, Issue 3, pp. 2530-2536 (2011)

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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.

© 2011 OSA

OCIS Codes
(000.5490) General : Probability theory, stochastic processes, and statistics
(100.2000) Image processing : Digital image processing
(100.5010) Image processing : Pattern recognition
(110.2970) Imaging systems : Image detection systems
(100.3008) Image processing : Image recognition, algorithms and filters
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Image Processing

Original Manuscript: November 29, 2010
Revised Manuscript: January 13, 2011
Manuscript Accepted: January 15, 2011
Published: January 26, 2011

Virtual Issues
Vol. 6, Iss. 2 Virtual Journal for Biomedical Optics

Seokwon Yeom, Dong-Su Lee, Jung-Young Son, Min-Kyoo Jung, YuShin Jang, Sang-Won Jung, and Seok-Jae Lee, "Real-time outdoor concealed-object detection with passive millimeter wave imaging," Opt. Express 19, 2530-2536 (2011)

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