惯例先放结果:
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsICM0EDMzATMyETOxYDM3EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
代码如下:
#include<opencv2/opencv.hpp>
using namespace cv;
int main() {
Mat frame = imread("1.jpg");
imshow("原图", frame);
int width = frame.cols;
int length = frame.rows;
Mat rotation=getRotationMatrix2D(Point2f(length/2, width/2), 45, 1.0);
warpAffine(frame, frame,rotation, Size(length, width));
imshow("旋转45度", frame);
waitKey(-1);
}
两个关键函数:
1.getRotationMatrix2D获取旋转矩阵,三个参数分别为:旋转中心点坐标,旋转角度,图片缩放比例
2.warpAffine应用仿射变换,参数分别为:输入Mat,输出Mat,旋转Mat,图片大小