一种基于top-hat变换的多车牌定位改进方法

In this paper, a new algorithm which can improve the accuracy of vehicle license plate location using top-hat transform is presented. Based on texture feature of license plates and the characteristic of top-hat transform, the top-hat coefficients are retained. Then the license plate can be located through smoothing, vertical direction information four connected region detection, density calculation and so on. The proposed algorithm was suitable for the single-license and multi-license plate detection in the various illumination conditions with high accuracy. The performance of the proposed algorithm has been tested on monitoring images obtained from the practical application. Experimental results show that our algorithm has better performance than others’ on location precision, misdetection rate, and misjudgment rate.