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Proceedings Paper

Horizontal tilt correction for license plate image
Author(s): Lirong Li; Hongshi Sang; Yufang Chang
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Paper Abstract

License plate location is the basis of LPR, and it is the most important part of it. Tilt vehicle license plate has an adverse effect on its character segmentation and recognition. In this paper, tilt models of a plate are analyzed and a novel approach for number plate tilt correction is presented. Horizontal incline angle is obtained by combining horizontal or vertical edge of a plate with its rotation projection. Bilinear interpolation rotation correction is performed to the plate which is tilt to the horizontal line. Experimental results show that the method can be implemented easily and offers robustness when dealing with dirty number plates and license plates in variant lighting conditions.

Paper Details

Date Published: 8 December 2011
PDF: 6 pages
Proc. SPIE 8002, MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis, 80021B (8 December 2011); doi: 10.1117/12.901914
Show Author Affiliations
Lirong Li, Huazhong Univ. of Science and Technology (China)
Hubei Univ. of Technology (China)
Hongshi Sang, Huazhong Univ. of Science and Technology (China)
Yufang Chang, Hubei Univ. of Technology (China)

Published in SPIE Proceedings Vol. 8002:
MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis
Faxiong Zhang; Faxiong Zhang, Editor(s)

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