OpenCV2 多摄像头读取视频实现

转自http://blog.csdn.net/wangzhebupt/article/details/21390449

 //编程环境：VS2012，Opencv2.4.6

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

 using namespace cv;
 using namespace std;

 int main(int argc, char* argv[])
 {

         VideoCapture cap1;
         VideoCapture cap2;
         cap1.open(0);
         cap2.open(1);
         if(!cap1.isOpened())
         {

             return -1;
         }
         if(!cap2.isOpened())
         {

             return -2;
         }



         double w = 320, h = 240;
         cap1.set(CV_CAP_PROP_FRAME_WIDTH,w);
         cap1.set(CV_CAP_PROP_FRAME_HEIGHT,h);
         cap2.set(CV_CAP_PROP_FRAME_WIDTH,w);
         cap2.set(CV_CAP_PROP_FRAME_HEIGHT,h);



         Mat frame1,frame2;
         bool stop = false;
         namedWindow("Video1");
         namedWindow("Video2");
         while(!stop)
         {
             cap1>>frame1;
             /*if (frame1.empty())
             {

                 return -1;
             }*/
             imshow("Video1",frame1);



             cap2>>frame2;
             /*if (frame2.empty())
             {

                 return -2;
             }*/
             imshow("Video2",frame2);

             if(waitKey(30) >=0)
             stop = true;
         }
         return 0;


 }

C 风格代码  OpenCV1 实现，较为鲁棒，环境同上

 #include <opencv2/opencv.hpp>
 using namespace cv;


 int main(int argc, char* argv[])
 {

     CvCapture* capture1 = cvCreateCameraCapture( 0 );
     CvCapture* capture2 = cvCreateCameraCapture( 1 );




     double w = 320, h = 240;



     cvSetCaptureProperty ( capture1, CV_CAP_PROP_FRAME_WIDTH,  w );
     cvSetCaptureProperty ( capture1, CV_CAP_PROP_FRAME_HEIGHT, h );
     cvSetCaptureProperty ( capture2, CV_CAP_PROP_FRAME_WIDTH,  w );
     cvSetCaptureProperty ( capture2, CV_CAP_PROP_FRAME_HEIGHT, h );


     cvNamedWindow( "Camera_1", CV_WINDOW_AUTOSIZE );
     cvNamedWindow( "Camera_2", CV_WINDOW_AUTOSIZE );


     IplImage* frame1;
     IplImage* frame2;


     while(1)
     {
         frame1 = cvQueryFrame( capture1 );
         //if( !frame1 ) break;
         cvShowImage( "Camera_1", frame1 );


         frame2 = cvQueryFrame( capture2 );
         //if( !frame2 ) break;
         cvShowImage( "Camera_2", frame2 );



         int key = cvWaitKey(30);
         if( key == 27 ) break;
     }

     cvReleaseCapture( &capture1 );
     cvReleaseCapture( &capture2 );

     cvDestroyWindow( "Camera_1" );
     cvDestroyWindow( "Camera_2" );


     return 0;
 }