准确对车牌进行定位,首先要把车牌图像灰度化，接着对图像进行中值滤波进行初步降噪，下一步进行Sobel纵向边缘检测，即增强车牌纵向边缘，边缘检测后进行二值化处理，此时车牌区域特征得到进一步加强，但同时又加强了背景中的部分噪声，所以再对其腐蚀，然后定位及截取车牌，最后对车牌进行二值化。-Accurate positioning of the plate,First, take the license plate image gray, then the image median filtering initial noise, the next step vertical Sobel edge detection, namely enhanced longitudinal edge plate, edge detection binarization processing, this time to get the license plate area features further strengthened, but at the same time strengthen the part of the background noise, so then its corrosion, and then locate and intercept the license plate, the plate final binarization.