一种快速的车牌定位与提取算法

A Fast License Plate Location and Extraction Algorithm

针对现有的车牌定位的各种局限性,本文提出了一种基于图像二维区域能量的车牌定位算法,给出了该算法实用公式,并给出了基于图像能量的车牌提取算法以及车牌区域的验证方法。该方法充分利用了车牌的纹理复杂、对比度鲜明、外型规则等特征构造能量图像,并对原有的能量算法进行了改进。其明显的优点是可以避免直接对图像进行二值化时阈值难以确定的问题以及光照情况对颜色的影响。大量的实验表明,该算法不仅简单、快速、准确率高,而且对车牌区域的噪声有很好的抑制作用。

For the limitation of the current license plate location algorithms,the paper presents an algorithm of license plate location based on the image 2-D area energy and its practical formulas,and Introduces the algorithm of extraction and methods to verify the region of the license plate.It takes full advantage of the characteristics of the license plate,such as complicated textures,sharp-cut contrast,and so on.It also has the advantages to avoid the difficulty to choose a threshold and the influence of color changes due to light.Many experiments demonstrate that the algorithm is of higher accuracy and of fast speed.