웹캠 두대 연결 및 ROI 이용하여 한개의 창에 출력하기

#include <iostream>
#include <cv.h>
#include <opencv.hpp>

using namespace std;
using namespace cv;
//row:height
//col:width

#define CAM_WIDTH 640
#define CAM_HEIGHT 360

int main()
{
	Mat img1;
	VideoCapture capture( 0 );

 	Mat img2;
 	VideoCapture capture2( 1 );
 
	Mat roi_img( CAM_HEIGHT, CAM_WIDTH * 2, CV_8UC3 );

	if (!capture.isOpened())
	{
		std::cout << "1카메라가 연결 되어있지 않습니다." << std::endl;
		return -1;
	}
	if (!capture2.isOpened())
	{
		std::cout << "2카메라가 연결 되어있지 않습니다." << std::endl;
		return -1;
	}
// 	namedWindow("image",1);
// 	namedWindow("image2",1);
	namedWindow("roi",1);

	int j = 1;
	while ( 1 )
	{
		capture.set( CV_CAP_PROP_FRAME_WIDTH, CAM_WIDTH );
		capture.set( CV_CAP_PROP_FRAME_HEIGHT, CAM_HEIGHT );
		capture >> img1;

		capture2.set(CV_CAP_PROP_FRAME_WIDTH,640);
		capture2.set(CV_CAP_PROP_FRAME_HEIGHT,360);
		capture2 >> img2;

// 		imshow("1",img1);
// 		imshow("2",img2);


 		Rect roi = Rect( 0, 0, CAM_WIDTH, CAM_HEIGHT );
		img2.copyTo( roi_img(roi) );

   		roi = Rect( CAM_WIDTH, 0, CAM_WIDTH, CAM_HEIGHT );
   		img1.copyTo( roi_img(roi) );

		imshow("roi",roi_img);

		if ( waitKey( 1 ) % 256 == 27 ) break;
	}
}