Firstly, we carry out vertical edge detection on the three components of Y, U and V because the vertical edges in the license plate area are very abundant.
该方法利用车牌区域竖直边缘异常丰富的特点，采用一种针对性很强的边缘提取算子，对Y，U和V三个颜色分量分别进行竖直边缘提取；
One is the edge detection level the other is to detect vertical flat edge.
一个是检测水平边沿的；另一个是检测垂直平边沿的。
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