High accuracy traffic monitoring using road-side line-scan cameras

This paper presents a new technique for simultaneous traffic monitoring and law enforcement using a roadside rig head based on two line-scan cameras. As the vehicle travels across the vertical scanning lines, two images are formed and can be correlated with each other to determine the vehicle speed. Our first tests showed that the resulting videos are easily interpreted by computers in real-time and that the measures are both accurate (less than 1% error) and stable. In addition to speed, the system is able to extract a broad range of traffic information, among others the vehicle size, acceleration and inter-vehicle distances