利用已有的摄像头内外参数，将侧视图通过透视变换转换为俯视图，并保存所得到的单应性矩阵H，内含运行实例-Use of existing internal and external camera parameters, the side view through the perspective transformation into top view, and save the resulting homography matrix H, containing a running instance

大头贴工具代码，在Opencv下开发的，比较简单，仅供参考，-da tou tie gong ju dai ma,zai Opencv xia kai fa de，bi jiao jian dan，jin gong can kao，xie xie

Otsu bi level threshold function, using Opencv implemented in C.