车牌图像的倾斜校正
Tilt correction of vehicle license plate image
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摘要: 针对目前车牌图像检测精度不高、检测到的倾斜角误差较大的问题,提出了基于Radon变换的车牌图像倾斜校正的方法.该方法对车牌图像进行牌照区域定位,分割出牌照区域图像;对牌照区域图像进行边缘检测,再对其进行Radon变换,对Radon参数进行分析得出水平倾斜角和垂直倾斜角,通过双线性插值方法校正车牌图像.实验结果表明所提出的方法可以实现多种倾斜方式的校正,对水平倾斜的校正效果最佳.Abstract: Aiming at the problem that current license plate image detection inaccuracy and inclination angle error is big,tilt correction of vehicle license plate approach was proposed based on Radon transformation.License plate was located in vehicle license image;then license plate image was used for edge detection and Radon transformation;according to Radon parameters,horizontal and vertical tilt angle were detected;vehicle license image was corrected using bilinear interpolation.Experiment results showed that this method could verify the correctness of the approach,which could realize the correction of all kinds of tilts.
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Key words:
- vehicle license plate image /
- tilt correction /
- Radon transformation
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