采用迭代算法，实现了图象分割阈值的最优自动选择，并对处理后的二值图象进行数学形态学操作，是后续图象识别最关键的以一环-using the iterative method, the image segmentation optimal threshold value of the automatic choice, as well as treatment, the two binary images using mathematical morphology operation, is the follow-up image recognition to the most crucial one in Central