Abstract: In order to complete the real-time traffic light command task accurately， flexibly and efficiently， machine vision is introduced to design a set of intelligent traffic light control system based on machine vision to meet the needs of intelligent urban road traffic lights at this stage. The system uses OV2640 camera to take pictures of the road conditions， collect image information， and store the collected data. Then， based on the series of algorithms YOLO （You Only Look Once） in visual processing， it carries out real-time recognition of the road conditions in the data， and transmits the recognition results to the timing module. Finally， it obtains the most timely data and processes it on the traffic lights in time， and has achieved good results in the simulation， further promoting the application of intelligent transportation system.

Key words: machine vision, target detection, timing algorithm, intelligent traffic light