[1]HUANG Teng,SHI Peng-fei.Locating vehicle license plates in a non-uniformly illuminated environment[J].CAAI Transactions on Intelligent Systems,2009,4(5):421-426.[doi:10.3969/j.issn.1673-4785.2009.05.006]
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Locating vehicle license plates in a non-uniformly illuminated environment

CAAI Transactions on Intelligent Systems[ISSN 1673-4785/CN 23-1538/TP] Volume: 4 Number of periods: 2009 5 Page number: 421-426 Column: 学术论文—机器感知与模式识别 Public date: 2009-10-25
Title:
Locating vehicle license plates in a non-uniformly illuminated environment
Author(s):
HUANG Teng;  SHI Peng-fei
Institute of Image Processing and Pattern Recognition, Shanghai Jiao Tong University, Shanghai 200240, China
Keywords:
nonuniform illumination;  Bernsen algorithm;  connected area;  license plate location
CLC:
TP391.4
DOI:
10.3969/j.issn.1673-4785.2009.05.006
Abstract:
An effective method was developed for determining the location of a vehicle’s license plates in an environment with nonuniform illumination. With an improved Bernsen algorithm, binarization of the image was able to significantly reduce the effects of nonuniform illumination. Then, by locating the numerical string within the image, we could locate a plate precisely by aligning the location of the characters according to the standard specifications for plates. Experimental results showed that the method is precise and effective. The rate of correct location was 98.3%.
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