opencv 车牌定位 得到二值图像，然后再用形态学扩张与形态学侵蚀，使得目标轮廓不会出现影响判断的断点与连接，最后根据寻找米粒的方法把车牌定位-opencv license plate location to get binary image, then use morphological dilation and morphological erosion, making the target profile will not affect the judge' s break wit