关键词: 运动车辆监控, 道路空隙, 光流场, 有限状态机

Abstract: Aimed at the situation when the traffic flow is very big，and the distance between vehicles is so small that the vehicles extracted by background subtraction cannot segment in real-time at a crossing in intelligent transportation system，a novel method of moving vehicles monitoring based on road interspace is proposed.The background is estimated by the method of optical flow computation，using the district calculated realize the simplification of the road information，the behavior what vehicle transgress the line to overtake another car is judged out according to the state of the interspace transfer based on the finite state machine model.Experiment shows that this method is able to monitor the behavior of the vehicles in real-time when the situation is complicated at the crossing，at the same time it can be a very good solution of the monitoring the behavior of the vehicles with illumination variation and noise interference.

Key words: moving vehicles monitoring, road interspace, optical flow, finite state machine