标定投影仪与摄像机之间的透视变换矩阵，将摄像机图像转换成投影仪视角下的图像-calibration and transformation between camera and projector

对一副图片内的四边形进行透视变换，可以得到四边形的四个点坐标以及对应的转换矩阵H。-A four-point coordinate of the quadrilateral and the corresponding transformation matrix H can be obtained by perspective transformation of the quadrilaterals in a picture.

IPM逆透视变换cmake，linux下运行，可以运行，自己需要提供相机参数(IPM reverse perspective transform cmake, Linux running, you can run, you need to provide camera parameters)