第一部分是基于颜色的记忆性图像检索，另外一部分为基于粗糙集理论的形态学算子。
The first part is a kind of store image retrieval base on color. Another is about morphology operators based on rough set theory.
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；
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.
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