大津法，将灰度图像转化为二值图像，选取的阀值是生成图像的方差最大-Otsu method, the grayscale image into a binary image, the selected threshold is the maximum variance of the image generated

全局阈值处理方法对单色图像进行分割，我们从适合检测不连续亮度的方法开始，比如点、线、边缘为大家介绍使用Otsu's方法的最佳全局阈值处理。(Global threshold processing method for monochrome image segmentation, we start with suitable for detecting method of discontinuous brightness, such as dot, line, edge to introduce