说明：  本文利用MATLAB从预处理、边缘检测、车牌定位、车牌切割，字符分割、字符识别等几个方面，具体介绍了数字图像处理中车牌自动识别的原理。
(In this paper , Principle of automatic license plate recognition in digital image processing is specially introduced using MATLAB from some perspectives , which conclude processing , edge detection , license plate location , license plate cutting , character segmentation ,character recognition. )