关键词: 车牌定位, 车牌识别, 智能交通系统

Abstract: This paper presents a novel method of the vehicle license plate location based on characteristics of fractal dimension under complex background.Here the image clipping，the transformation of grayscale image，and the constructing procedure of grayscale transfer function with the image enhancement are researched.Then the calculation technique of fractal dimension of plate image is given meanwhile the license region is determined.Moreover，the fractal dimension of multi-vehicle license plate image is mainly from 2.65 to 2.80 which is larger than that of whole vehicle license plate image，but smaller than individual vehicle license plate image.Independent of color，shape and size of vehicle license plate，this algorithm not only is of convenience but also has good robustness.The performance of the proposed algorithm has been tested on a large number of experimental data from random and real images.Based on the experimental results，this algorithm shows both the missing rate and false detection rate are all zero.The possibility that the candidate region is more than one is 50%，at the same time the probability of correction for inspect is up to 100%.

Key words: vehicle license plate location, vehicle license plate recognition, intelligent traffic system