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Chinese license plate character segmentation using multiscale template matching

[+] Author Affiliations
Jiangmin Tian, Guoyou Wang, Jianguo Liu, Yuanchun Xia

Huazhong University of Science and Technology, School of Automation, State Key Laboratory for Multispectral Information Processing Technology, 1037 Luoyu Road, Wuhan 430074, China

J. Electron. Imaging. 25(5), 053005 (Sep 08, 2016). doi:10.1117/1.JEI.25.5.053005
History: Received May 4, 2016; Accepted August 15, 2016
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Abstract.  Character segmentation (CS) plays an important role in automatic license plate recognition and has been studied for decades. A method using multiscale template matching is proposed to settle the problem of CS for Chinese license plates. It is carried out on a binary image integrated from maximally stable extremal region detection and Otsu thresholding. Afterward, a uniform harrow-shaped template with variable length is designed, by virtue of which a three-dimensional matching space is constructed for searching of candidate segmentations. These segmentations are detected at matches with local minimum responses. Finally, the vertical boundaries of each single character are located for subsequent recognition. Experiments on a data set including 2349 license plate images of different quality levels show that the proposed method can achieve a higher accuracy at comparable time cost and is robust to images in poor conditions.

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Citation

Jiangmin Tian ; Guoyou Wang ; Jianguo Liu and Yuanchun Xia
"Chinese license plate character segmentation using multiscale template matching", J. Electron. Imaging. 25(5), 053005 (Sep 08, 2016). ; http://dx.doi.org/10.1117/1.JEI.25.5.053005


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