Research On Licence Plate Recognition System Based On J2ME

Along with the development of transport, the number of vehicles is increasing, so the intelligent management of our vehicles is in urgent demand. while digital image processing technology that has come in today, so people have already tried to use digital image processing tools to solve the problem that number of vehicles is increasing large. As such a large amount of vehicles, an effective traffic management system must be designed to achieve intelligent management of the data on vehicles, the parameters of the vehicles contain model of cars, license plate, vehicle color, etc. in which the license plate is the most important one. So through identification of vehicle license, we can achieve effective management of vehicles. In this paper, first we apply the classic algorithm of digital image processing to analyze the sample images, the height and width of characters on the plate, the width of character spacing, border size and other parameters are measured in the image of the vehicle, and the size of the image is 1600×1200pixs. This provide us the basis for image processing, then we use the MATLAB Image Processing Toolbox in the design of license plate recognition algorithm, after algorithm simulation, we tried to use the camera on cell phone to capture the vehicle image that must contain the plate license, J2ME platform is supported by major mobile phone manufacturers now, so we make use of the platform to achieve the identification and recording of vehicle license. So we achieve mobility of car plate recognition and code portability, while a real-time transmission function can be extended. All of this lay a good foundation for the intelligent management of vehicle licenses.This paper describes the process of vehicle license plate recognition on the J2ME platform, two principal tasks: first, vehicle license plate recognition algorithm will be designed and simulated using basic theory of digital image processing. The sample image will be analyzed through the function in digital image processing toolbox in MATLAB. Different effect of plate recognition will be shown in various factors of image, so we should design algorithm in variable parameters. The contrast of effect in different factors of image and parameters of algorithm must be observed. Finally an algorithm of license plate recognition is determined. It contains location of plate, character segmentation, character recognition, which is ultimate algorithm we determined. In programming, we also refer to the main idea of the algorithm to complete the preparation of various functional code. Second, this paper describes architecture of J2ME platform which is supported by the current popular mobile phone. Also the function of the three parts (configuration, summary table, the optional package) in architecture, and which optional packages we have mainly used in designing the application, but also describes the steps in development of mobile applications on the basic: development platform structures, access to local resources, the button incident response, the preparation of digital image processing library, MIDlet class preparation, and computer simulation. If the simulation on PC products no error, no exception, we can create a package and download to the phone and run.Finally, we introduced the application running on mobile phones, also the problem we encountered. That is invalid jar file when we create package on the Eclipse platform and run on the mobile phone, it can be resolved by rewriting the entrance way of the jad file. Now it runs smoothly on the phone.