OpenCV 调用双摄像头

 #include <opencv2/opencv.hpp>
 #include<iostream>

 using namespace cv;
 using namespace std;

 int main()
 {
     //initialize and allocate memory to load the video stream from camera
     VideoCapture camera0();
     camera0.set(CV_CAP_PROP_FRAME_WIDTH, );
     camera0.set(CV_CAP_PROP_FRAME_HEIGHT, );
     VideoCapture camera1();
     camera1.set(CV_CAP_PROP_FRAME_WIDTH, );
     camera1.set(CV_CAP_PROP_FRAME_HEIGHT, );

     if (!camera0.isOpened()) return ;
     if (!camera1.isOpened()) return ;

     while (true)
 {
         //grab and retrieve each frames of the video sequentially
         Mat3b frame0;
         camera0 >> frame0;
         Mat3b frame1;
         camera1 >> frame1;

         imshow("Video0", frame0);
         imshow("Video1", frame1);
         //      std::cout << frame1.rows() << std::endl;
         //wait for 40 milliseconds
         int c = waitKey();

         //exit the loop if user press "Esc" key  (ASCII value of "Esc" is 27)
         if ( == char(c)) break;
     }

     return ;
 }