OpenCV2 多摄像头读取视频实现

https://blog.csdn.net/wangzhebupt/article/details/21390449

//编程环境：VS2012，Opencv2.4.6

#include
#include

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
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;
}