OpenCV从摄像头读取视频

#include <opencv2/core/core.hpp>#include <opencv2/highgui/highgui.hpp>#include <iostream>using namespace cv;using namespace std;int main(int argc, char* argv[]){VideoCapture cap(0);if(!cap.isOpened()){printf("Open camera/video failed.\n");return -1;}namedWindow("image", 1);Mat frame;while(cap.grab() && cap.retrieve(frame)){// do something here.imshow("image", frame);if(waitKey(30) >= 0)break;}return 0;}