旋转视频与旋转图像类似。唯一的区别是我们不是将静态图片加载到图像矩阵中，而是加载了视频或从相机获取视频流。
这里，我们不是加载视频，而是使用相机拍摄视频。如果要使用视频文件，只需正确输入视频文件的地址即可。
以下程序演示了如何使用C++在OpenCV中旋转视频。
示例 H2>
#include#include#includeusing namespace std;using namespace cv;int main(int argc, char* argv[]) { VideoCapture loadvideo(0);//capture video from default camera// namedWindow("OriginalVideo");//declaring window to show original video stream// namedWindow("RotatedVideo");//declaring window to show rotated video stream// int rotating_angle = 180;//initial rotation angle// createTrackbar("Rotation", "RotatedVideo", &rotating_angle, 360);//creating trackbar for rotation// while (true) { Mat before_Rotating;//declaring matrix for image before rotation// bool temp = loadvideo.read(before_Rotating);//load frames from video source to matrix// imshow("OriginalVideo", before_Rotating);//show image frames before rotation// Mat for_Rotation = getRotationMatrix2D(Point(before_Rotating.cols / 2, before_Rotating.rows / 2), (rotating_angle - 180), 1);//affine transformation matrix for the 2D rotation// Mat after_Rotating;//declaring matrix for image after rotation// warpAffine(before_Rotating, after_Rotating, for_Rotation, before_Rotating.size());//applying affine transformation// imshow("RotatedVideo", after_Rotating);//show image after rotating// if (waitKey(30) == 27){ //wait till Esc key is pressed from keyboard// break; } } return 0;}
输出
#include#include#includeusing namespace std;using namespace cv;int main(int argc, char* argv[]) { VideoCapture loadvideo(0);//capture video from default camera// namedWindow("OriginalVideo");//declaring window to show original video stream// namedWindow("RotatedVideo");//declaring window to show rotated video stream// int rotating_angle = 180;//initial rotation angle// createTrackbar("Rotation", "RotatedVideo", &rotating_angle, 360);//creating trackbar for rotation// while (true) { Mat before_Rotating;//declaring matrix for image before rotation// bool temp = loadvideo.read(before_Rotating);//load frames from video source to matrix// imshow("OriginalVideo", before_Rotating);//show image frames before rotation// Mat for_Rotation = getRotationMatrix2D(Point(before_Rotating.cols / 2, before_Rotating.rows / 2), (rotating_angle - 180), 1);//affine transformation matrix for the 2D rotation// Mat after_Rotating;//declaring matrix for image after rotation// warpAffine(before_Rotating, after_Rotating, for_Rotation, before_Rotating.size());//applying affine transformation// imshow("RotatedVideo", after_Rotating);//show image after rotating// if (waitKey(30) == 27){ //wait till Esc key is pressed from keyboard// break; } } return 0;}
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