opencv打开USB摄像头

代码说明：

#include #include #include #include using namespace cv; int main() {  VideoCapture capture(1);  //namedWindow("a", CV_WINDOW_NORMAL);  //setWindowProperty("a", CV_WND_PROP_FULLSCREEN);  //capture.set(CV_CAP_PROP_FRAME_WIDTH, 1920.0);  //capture.set(CV_CAP_PROP_FRAME_HEIGHT, 1920.0);    while (1)  {   Mat frame;   capture >> frame;     imshow("a", frame);   waitKey(30);  }    return 0; }