It is presented a remote sensing approach for automatic traffic monitoring based on an airborne wide angle digital camera system, namely the '3K-Camera', which was recently developed at the German Aerospace Center (DLR). This wide angle frame sensor system consists mainly of three non-metric off-the-shelf Canon EOS IDs Mark II digital cameras (one nadir, and two side looking) being able to take 16.7 megapixel color images with a frame rate of up to 3 fps. With an oblique angle of 35 for the side looking cameras the coverage of the camera system is up to 8 km /1.5 km across track/in flight direction (at a flight height of 3000 m with a ground sampling distance of 45 cm). With the digital images of this sensor being time synchronized to a GPS/IMU unit, direct georeferencing of the obtained aerial images is performed. In order to perform near real-time processing of images to derive traffic information five Industrial PCs are onboard the aircraft as well as a downlink antenna for sending traffic data extracted from aerial images directly to the ground. The processing chain for traffic data extraction is mainly divided in roadside detection, roadside identification, vehicle detection and vehicle tracking. Road detection is performed in order to constrain the search area for vehicles to the road network. The vehicle detector is based on feature extraction by a Canny edge detector as well as geometric evaluation of edges in order to identify edges belonging to vehicles. Vehicle tracking is performed on template matching based on normalized cross correlation of vehicles detected in the first image of an image sequence.
An airborne wide angle camera system for automatic near real-time road traffic monitoring
Ein Flugzeug-Weitwinkel-Kamerasystem zur automatischen Echtzeit-Nah-Straßenverkehrsüberwachung
2009
12 Seiten, 6 Bilder, 1 Tabelle, 14 Quellen
Conference paper
English
Towards automatic near real-time traffic monitoring with an airborne wide angle camera system
Springer Verlag | 2009
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