摘要

License plate recognition system (LPRS) is one of the most important parts of the intelligent transportation system (ITS), and the license plate location is the most important step of the LPRS, it derectly affects the performance of the character segmentation and recognition afterward. In this paper, an effective algorithm of lisence plate location is proposed. In this method, Firstly we obtain high frequency coefficient through 1-D discrete wavelet transform. Then we process the image with median filtering, binarization and morphology operation. Finally, we label and record the connected regions. Then we can locate the candidate license plates according to the region information. Experiment proved that our method performs well in the long range and complex scenes, and performs well on located speed and robustness.

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