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王义兴, 黄凤岗, 韩金玉, 尚治国(哈尔滨工程大学计算机科学与技术学院, 哈尔滨 150001)

摘 要
License Plate Location Based on Color Matches and Texture Feature

WANG Yixing, HUANG Fenggang, HAN Jinyu, SHANG Zhiguo(College of Computer Science, Harbin Engineering University, Harbin 150001)

License plate location is the key technology of license plate recognition. At present license plate color and texture feature were considered in the most license plate location methods, however, these methods had weak adaptability in different environment. In order to solve the problem, firstly, since the fixed color matches of the vehicle license plate, a color matched template matrix was constructed, which was used to restrict the initial edge detected image, so a restricted binary edge image could be obtained. Then, some morphologic operators which have the ability of eliminating noise were applied to form initial localization candidate regions. Finally, according to the texture feature of the license plate, the real license plate area was chosen from candidate regions. BP neural network was adopted to attain the strongly adaptive method which was used to recognize different colors in HSI space. And for shortening the period of location, only the color space in the neighborhood of edge pixels were conversed. The experiment showed that the accurate location of the license plate could be achieved in the complicated environment and different illumination, making use of this method.