汽车车牌识别，主要包括绘制灰度直方图，直方图均衡化，图像均衡化等预处理，车牌粗定位，车牌倾斜校正，定位车牌后的预处理，上下边框去除。-Car license plate recognition, including drawing gray histogram, histogram equalization, image preprocessing equalization, license plate coarse positioning plate tilt correction, posi