Research on License Plate Location Algorithm
License plate location is an important step in car license plate recognition technology applications. Many scholars have developed many license plate detection algorithms; this paper will introduce some current technologies of license plate location. In t
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Research on License Plate Location Algorithm Qing Yan Abstract License plate location is an important step in car license plate recognition technology applications. Many scholars have developed many license plate detection algorithms; this paper will introduce some current technologies of license plate location. In this paper, several common license plate location methods are introduced briefly and compared. Keywords License plate location • Texture analysis • Edge detection • Mathematics morphology • Wavelet analysis
48.1 Introduction License plate recognition technology is the important means of traffic management automation. After a series of calculation, the technique can identify the vehicle license plate number within the visual field [1]. By using the digital image processing, pattern recognition, artificial intelligence technology, the acquisition of vehicle image processing methods, the technique can accurately identify the license plate numbers, letters and Chinese characters and give the recognition result that computer can be directly run data form; this lets the vehicle computer monitoring and management becomes a reality. Analyses of complex background image with the vehicle, after the license plate character location, character segmentation; license plate recognition technology finally automatically identifies the vehicle license characters. In order to ensure that the automobile license plate recognition system can play its due role in the complex environment, recognition system must meet the following requirements: (1) Robustness: In any case, the system can reliably work properly and has higher recognition rate. Q. Yan (*) Shandong Institute of Commerce and Technology Automotive and Electronics, Institute of Technology Jinan, Jinan, Shandong 250103, China e-mail: [email protected]
Z. Zhong (ed.), Proceedings of the International Conference on Information Engineering and Applications (IEA) 2012, Lecture Notes in Electrical Engineering 217, DOI: 10.1007/978-1-4471-4850-0_48, © Springer-Verlag London 2013
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(2) Real time: Regardless of the motor vehicle is stationary or high-speed operation, the system must be in a certain period of time identification plates all characters, to achieve real-time recognition. License plate recognition technology comprises the following three parts: license plate location, character segmentation and character recognition. In which, license plate locating accuracy directly determines the character segmentation and recognition effect and affects the entire LPR system identification rate of primary factors. Therefore, license plate location technology is the most critical step of license plate recognition technique. Now license plate location methods are varied, which is typically include method of license plate location based on edge detection, method of license plate location based on color segmentation, method of license plate location based on wavelet transform, method of license plate location based on genetic algorithm, method of
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