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With the improvement of living standards,vehicle speed is the most serious traffic safety accidents.From the human point of view function,Narrow field of vision so that the driver for speeding,the feeling on both sides of the road obscure targets,reducing the distance to the target recognition,could easily lead to wrong judgment;Another speeding pedestrians will prepare the case without bringing panic,in a short time will make them depressed mental state,Appear even thought rigid, action is out of control.At present the recognition of the speed limit and positioning of the speed limit the stillness of the only picture positioning and recognition,Aimed at speeding harm,this paper adopts machine vision technology,has established a set of machine vision automatic identification system speed limit.The main research contents are as follows:1) Speed limit signs based on machine vision recognition algorithm.For road conditions,weather,vehicle interference jitter and other factors,cause the video size is too large or too small,color distortion,blur,the use of pretreatment,inhibited the degradation of the image to prevent signal interference and enhance image processing and will be observed Different images under the same constraints is very important correction;The composition for the speed limit is a circle,using Hough transform,with a focus to reduce storage and improve computing speed,effectively reducing the noise interference;For non-speed limit interference,Using Canny algorithm,by Canny operator,Roberts operator,Sobel operator,Prewitt operator contrast,Canny algorithm that speed and accuracy;Finally,the speed limit in the location and identification,Proposed a fast and accurate template matching method.2) Car speeding automatic monitoring hardware prototype system construction.Mainly introduces the GPS module and the working principle of GPRS module,and they receive and the data transfer processes.This system to the speed limit speed reference speed, then measured the speed with GPS module,judge whether compared vehicle-mounted value for speeding.3) The speed limit automatic identification system test.The system in Beibei District of Chongqing City,the highway leading to the main city of Chongqing,Beibei District roads and highways with the field test,Through 5km/h,to 20km/h,30km/h,40km/h,60km/h,80km/h,100km/h localization and identification of testing,Machine vision speed limit that the automatic identification system to the rapid and accurate for automatic monitoring of vehicle speeding.
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