AUTOMATIC TRAFFIC SIGNS INVENTORY USING A MOBILE MAPPING SYSTEM For GIS applications


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    Views: (1057)   Date: (22-01-08)   Pages: ()
  • Author:  by S?rgio R. Madeira  Lu?sa C. Bastos  Ant?nio M. Sousa  Jo?o F. Sobral  Lu?s P. Santos  

  • Abstract:  A Mobile Mapping System (MMS) designed to support quick surveys of traffic signs, including automatic sign recognition and exact location, is being developed in a partnership between Geonav, a private enterprise, and the University of Minho. The system acquisition is based on a road survey in a vehicle carrying digital video cameras, and a navigation system based in the integration of DGPS with an Inertial Measurement Unit and other dead reckoning systems. The acquisition system allows the association of a rigorous position and attitude to each digital frame. Furthermore, the pixel locations of every traffic sign visible in the video can be identified automatically through dedicated software, and their absolute geographical coordinates can be extracted. During the acquisition and processing stages, the relevant data is archived in a data base compatible with most CAD/SIG applications. Results of the tests carried out with this system show its effectiveness, with a good percentage of the traffic signs being automatically recognized and geo-referenced.

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