摘要: 　Aim　To study a real-time traffic flowmeasurement system providing necessary statistics of traffic flow parameters for trafficdepartments through measuring vehicle number, velocity and other traffic parameters.MethodsThe real-time traffic flow measurement was processed through image difference method.Because of its capability for data processing at high speed, the RISC (reduced instructionset computer) was used to carry out real-time and practical research on the whole system. ResultsExperiment devices of real-time traffic flow measurement was developed and the practicalalgorithm of image processing was designed and debugged. Conclusion Inpractical traffic flow measurement, the precision of measuring vehicle number is over 95%.The system work robustly under various conditions, it can automatically cope with thegradual and sudden changes of the environment light.