License Plate Location Detection Technology Based On Image Processing

Recent years, growing burden to transportation system caused by rapidly ncreasing vehicles around the world have aroused attention on ITS (Intelligence Transportation System, that is auto-control and manage the road traffic) in many countries. However, our country fall behind in this field, whose management of road and vehicle still stays on the manual level. In this condition appears the VLPRS (Vehicle License Plate Recognition System),it has very important meaning as a acquisition module of traffic information , to digitized traffic rate of flow administration , traffic violation administration.The thesis designs that to realize a license distinguishing system for project target , priority composes in system , the digital picture handles the algorithm realization waiting for a part to have carried out large amount of the part studying priority among them depends on the license fixes position.The system the license is distinguished requires that anastomosing computer vision , the digital picture handle and principles of pattern recognition technology waits for much aspect knowledge. The license distinguishes system a important component in deploy to be future city intelligence traffic supervisory control system, in city road intersection mouth, by the fact that the license distinguishing but the situation checking and counting a vehicle, providing the real time traffic stream data for the signal lamp matches time; Can record the vehicle breaking rules and regulations at the same time , improve city road traffic capacity , cut down the economic losses that the road accident and traffic jam bring about. The head shoots the system license in thesis is distinguished first by simulating camera shooting according to triggering condition , gain to the photograph information containing vehicle license plate, again, search for , check , fix position and then by that video frequency collects card digitization, by the fact that image treatment module is in progress, carve up out and the rectangle area containing the license plate character , the value carrying out two on license plate character finally is spent and whose division is distinguished for single characters , the entire queens of gauge import character identification subsystem go alongIn the cross sections, the vehicle condition can be tested, current traffic flow can be computed, and the real-time statistic can be provided for the matching of signal lights by LPR. Meanwhile, it can record the traffic violation and improve the road capacity which leads to the deduction of economic loss due to the accidents and jams. Its operational principle is to search, test, locate and cut out the rectangle area including characters of license plate among photos by vision collecting card, and then binarize these characters and divide them into single one which later are organized and put in the subsystem for recognition.