An Algorithm Based on Geometric Region to Correct Tilt License Plates

In the vehicle license plate recognition system(LPR), the license plate image would inevitably tilt to an extent. However, the tilt images will bring more difficult for further accurate segmentation and identification of characters, will eventually affect the recognition accuracy greatly. The traditional methods which based on Hough transform, in many situation, often can not accurately and promptly correct the plates, moreover, it needs a great amount of calculation, so the overall result is unsatisfactory. In this paper, Using a new algorithm based on geometric region, through rotating license plates, seeking for the minimum geometry region, then fast and accurate correction plates. The experimental results show that this method can detect the angle of tilt plates with simple calculation and high precision, which is better than the traditional algorithm based on Hough transform.