Car License Plate Recognition System Applied Research

In recent years, with the rapid development of the economy of our country, China automobile market increases continuously and fast; the owning amount of the automobile increases so sharply that the highway communication becomes the important way of traffic and transportation. The amount of motor vehicles increases day by day, which has brought a lot of troubles such as traffic jam, frequent traffic accident, environmental pollution etc. So it has already become the common trend of traffic administration of globalization city to utilize the high-tech to develop intellectual traffic system (Intelligence Traffic System, for short ITS) to realize the automatic control of the traffic and management, the recognition technology of license plate has been brought to bear at this situation. The automatic recognition technology (LPR) of license plate of the automobile is as an important component of the intellectual traffic system, playing an important role. Using this technology can realize the automatic registration of the vehicle, validation, monitor and alarm, the express way charge, management of parking area, the vehicle's pass in and out permission in the special place etc.This paper which is based on the basic theories of image recognition and the existing technological foundation utilizes the technology of image processing, the visual technology of the computer, the fuzzy recognition, etc. synthetically, to emphasize the license plate segmentation, character segmentation and feature extracting character recognition and put forward some new algorithms or carried on improvement to the existing algorithm. Then the extracted feature has been put into fuzzy classifier and presented detection results.Based on the principles mentioned above, this paper mainly finished the following contents according to the concrete characteristics of the license plate discerned.(1) Described several kinds of application technology of the license plate of carand development tendency of the present stage.(2) Introduced the design of software and hardware of the license plate recognition system of car briefly.(3) Various kinds of methods and characteristics of previous image processing have been discussed and have been found out the method, which is suitable to this system.(4) Introduced the technology of orientation and segmentation of car plate in detail.(5) Character segmentation has been realized more successfully and seven efficient feature adapted to this system has been extracted too.(6) Applied the knowledge of fuzzy theory and has realized fuzzy recognition of the character on license plate. At the end of this paper, the experiment result has been given out.The experimental data indicates that the License plate can be oriented, cuts apart and discerns more accurately in this system. It proved at the same time that using many kinds of image processing and recognition technology can improve systematic recognition capability, Utilizing fuzzy knowledge on the basis of valid, practical principle not only can raise the rate of recognition of Chinese character, English letter and the figures on the number plate of automobile, but also can suit the current situation of the traffic automobile industry of our country and has very important research and development value.