精准的车牌定位，预处理过后，先消弱背景干扰，用自定义模版中值滤波，然后利用水平投影法检测水平位置，用垂直投影法检测垂直位置，最后截取车牌图像-Precise license plate locating, after pretreatment, weaken the background interference, first with a custom template median filter, and then use the level of the horizontal projec