透视变换,由于摄像头存在透视效果 所以很多时候需要进行世界坐标系和图像坐标系下的转换-perspective transformation, As the camera lens effect so there is often the need for the world coordinate system and the image coordinate system conversion

把倾斜的ppt等平面文件通过透视变换只懂转为正面。(Tilt the PPT flat file into perspective only by perspective transformation.)