Volume 6 Number 2
May 2009
Article Contents
Mei-Sen Pan, Qi Xiong and Jun-Biao Yan. A New Method for Correcting Vehicle License Plate Tilt. International Journal of Automation and Computing, vol. 6, no. 2, pp. 210-216, 2009. doi: 10.1007/s11633-009-0210-8
Cite as: Mei-Sen Pan, Qi Xiong and Jun-Biao Yan. A New Method for Correcting Vehicle License Plate Tilt. International Journal of Automation and Computing, vol. 6, no. 2, pp. 210-216, 2009. doi: 10.1007/s11633-009-0210-8

A New Method for Correcting Vehicle License Plate Tilt

  • Received: 2008-05-20
Fund Project:

supported by Scientific Research Fund of Hunan Province, PRC (No.07JJ6141);Scientific Research Fund of Hunan Provincial Education Department, PRC (No.06C582)

通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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A New Method for Correcting Vehicle License Plate Tilt

Fund Project:

supported by Scientific Research Fund of Hunan Province, PRC (No.07JJ6141);Scientific Research Fund of Hunan Provincial Education Department, PRC (No.06C582)

Abstract: In the course of vehicle license plate (VLP) automatic recognition, tilt correction is a very crucial process. According to Karhunen-Loeve (K-L) transformation, the coordinates of characters in the image are arranged into a two-dimensional covariance matrix, on the basis of which the centered process is carried out. Then, the eigenvector and the rotation angle are computed in turn. The whole image is rotated by -. Thus, image horizontal tilt correction is performed. In the vertical tilt correction process, three correction methods, which are K-L transformation method, the line fitting method based on K -means clustering (LFMBKC), and the line fitting based on least squares (LFMBLS), are put forward to compute the vertical tilt angle . After shear transformation (ST) is imposed on the rotated image, the final correction image is obtained. The experimental results verify that this proposed method can be easily implemented, and can quickly and accurately get the tilt angle. It provides a new effective way for the VLP image tilt correction as well.

Mei-Sen Pan, Qi Xiong and Jun-Biao Yan. A New Method for Correcting Vehicle License Plate Tilt. International Journal of Automation and Computing, vol. 6, no. 2, pp. 210-216, 2009. doi: 10.1007/s11633-009-0210-8
Citation: Mei-Sen Pan, Qi Xiong and Jun-Biao Yan. A New Method for Correcting Vehicle License Plate Tilt. International Journal of Automation and Computing, vol. 6, no. 2, pp. 210-216, 2009. doi: 10.1007/s11633-009-0210-8
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