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21 September 2004 Use of COTS technology in tripwire detection
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This paper describes a polarised Short Wavelength Infra-Red (SWIR) system using Commercial Off-The-Shelf (COTS) technology, which was assessed against a variety of tripwires and backgrounds during night and day trials as part of a DSTL (UK) programme. The system comprises a polarised SWIR illuminator and cameras fitted with SWIR filters and polarisers. Various image-processing techniques were developed and evaluated including Stoke's S1 parameter, the Radon Transform and a novel and robust feature detector. Within the limits of the optical system, a tripwire recognition capability in vegetation was achieved that approached that of a human.
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David J. Daniels, Stefan Jennings, Rajan Amin, Michael J. Gaskell, and Nicola A. Playle "Use of COTS technology in tripwire detection", Proc. SPIE 5415, Detection and Remediation Technologies for Mines and Minelike Targets IX, (21 September 2004);

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