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, positioning license plate after the pretreatment, remove the upper and lower borders.