OTSU方法计算图像二值化的自适应阈值,算法对输入的灰度图像的直方图进行分析，将直方图分成两个部分，使得两部分之间的距离最大。划分点就是求得的阈值。 -OTSU method of adaptive image binarization threshold, the algorithm of the input histogram analysis of gray image, the histogram is divided into two parts, making the maxim