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

透视变换，根据已得到的单应性矩阵H，将摄像头所拍摄的侧视图转换为俯视图，内含运行实例-Perspective transformation, according to what has already been homography H, the camera is filming side view into vertical view, containing a running instance