图像的仿射变换程序,倾斜变正视。对一张拍摄（倾斜角度）到放在桌面的A4纸的图片做一个仿射变换，由倾斜的角度变换成正视的情况。-Image affine transformation process, tilt change address. On a shot (angle) to A4 paper on the desktop image to be a affine transformation, by the tilt angle transformation into a face si