Journal Published Online: 01 May 2002
Volume 47, Issue 3

A 3-D Transformation to Improve the Legibility of License Plate Numbers



In this paper, a novel three-dimensional transformation method for vehicle license plate number recognition is proposed. This method provides an efficient solution to normalize skew distorted vehicle license plate images. The Hough transform is used to estimate the license plate position and the normalization angle. After the three-dimensional transformation and normalization processes, the vehicle license plate numbers are recognized easily. Real vehicle license plate images are used to show the capability of the proposed method. The provided method is also useful for other skewed writings, such as the text printed on a suspect's shirt.

Author Information

Wen, C-Y
Central Police University, Taoyuan, Taiwan
Yu, C-C
Central Police University, Taoyuan, Taiwan
Hun, Z-D
Central Police University, Taoyuan, Taiwan
Pages: 8
Price: $25.00
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Stock #: JFS15298J
ISSN: 0022-1198
DOI: 10.1520/JFS15298J