OpenCV 4下的图像任意角度的旋转 //待旋转的图像Img_old //返回的旋转后图像类型 IplImage* Img_tmp. //旋转的角度,单位度. //三种不同的方法.其中方法二没有完全测试,方法一可以满足大部分需要-OpenCV four images of arbitrary rotation angle / / Image Rotation question Img_old / / to return to the rotation after the image type IplImage * Img_tmp. / / Rotation angle, unit degrees. / / Three different ways. Two methods which do not fully test one way to meet the needs of the majority