Method for determining position and speed of vehicles

摘要

An overview camera continually films a road section, in which a processing unit determines the positions of a vehicle at two different points in time by calculating the positions of the vehicle in the recorded video pictures. The elapsed time between these two points in time is determined by adding the number of recorded video pictures between the video pictures recorded at these points in time and multiplying the result by the time interval in which the video pictures are recorded. The speed of the vehicle can be calculated accurately from the distance between both determined positions and the elapsed time. The video picture is first calibrated using markings 4 on the road in order to calculate the positions of a vehicle from a video picture. The position of a vehicle is determined by automatically moving an imaginary measurement line 5 from one of these markings in the video picture to the vehicle to be measured. If it is determined that the speed of the vehicle is higher than the maximum permitted speed, the vehicle can be registered by making a detailed photograph of the vehicle with a registration camera.