车牌提取：利用车牌的颜色、面积、长宽以及宽高比等特征对车牌区域进行提取，其中主要用到了二值图像的开闭运算技术。实验用的车牌均为白字蓝底，因此可以先找到图像中的蓝色区域，生成一张蓝色区域识别二值图，若判定为蓝色，值为1，若判定为非蓝色，值为0。利用开闭运算，对图像做预处理，然后再利用车牌的其他物理特征对车牌区域作进一步的识别。-Plate Extraction: Using color plates, area, length and width and aspect ratio and other features on the license plate area extraction, which mainly uses the binary image of the opening and closing operation technology. The experimental plates were blue and white, it can be found in the blue region of the image, generating a binary image of the blue area identification, it is determined if the blue, a value of 1, if it is determined as non-blue, the value of 0. Use opening and closing operation, the image preprocessing, and then use other physical characteristics license plate area for further identification.