利用OpenCv函数实现了对一幅图像的旋转操作，和matlab自带的函数不同，有具体实现过程-Use OpenCv function implements the rotation operation on an image, and a built-in function matlab different, there are specific implementation process

图像旋转，功能与matlab函数imrotate一样-Image rotation, the same function with matlab function imrotate