OSTU算法目的就是计算出一连通区域的阈值，然后对该区域二值化-OSTU algorithm purpose is to calculate the threshold of a connected region, then the binary in the region

本例使用了opencv中图像数据结构IplImage ：首先进行第一次扫描，标记连通区域；然后对等价标记进行合并，最后进行第二次扫描，对等价标记进行重新标记。-This example uses a data structure of the opencv: IplImage. First, scan for the first time, marking connected region then mark the merger of the equivalence, and final