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

一个surfopen库，用GPU加速,值得看一下-surfopen

使用opencv，首先提取两幅图像的surf特征点，然后匹配，求单应矩阵，然后分解得到旋转角度。保证可用，走过路过不要错过。-Using opencv, first extracting feature points of the two images of the surf, and then matching, seeking homography, then decomposition rotation. Guarantee is available, do not miss passin