Horizontal tilt correction for license plate image

Lirong Li; Hongshi Sang; Yufang Chang

doi:10.1117/12.901914

8 December 2011 Horizontal tilt correction for license plate image

Lirong Li, Hongshi Sang, Yufang Chang

Proceedings Volume 8002, MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis; 80021B (2011) https://doi.org/10.1117/12.901914
Event: Seventh International Symposium on Multispectral Image Processing and Pattern Recognition (MIPPR2011), 2011, Guilin, China

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.

Citation Download Citation

Lirong Li, Hongshi Sang, and Yufang Chang "Horizontal tilt correction for license plate image", Proc. SPIE 8002, MIPPR 2011: Multispectral Image Acquisition, Processing, and Analysis, 80021B (8 December 2011); https://doi.org/10.1117/12.901914

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