We are going to create a basic user interface with OpenCV. The OpenCV user interface allows us to create windows, add images to it, move it, resize it, and destroy it.
The user interface is in the OpenCV's module called highui:
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
// OpenCV includes
#include "opencv2/core.hpp"
#include "opencv2/highgui.hpp"
using namespace cv;
const int CV_GUI_NORMAL= 0x10;
int main( int argc, const char** argv )
{
// Read images
Mat lena= imread("../lena.jpg");
Mat photo= imread("../photo.jpg");
// Create windows
namedWindow("Lena", CV_GUI_NORMAL);
namedWindow("Photo", WINDOW_AUTOSIZE);
// Move window
moveWindow("Lena", 10, 10);
moveWindow("Photo", 520, 10);
// show images
imshow("Lena", lena);
imshow("Photo", photo);
// Resize window, only non autosize
resizeWindow("Lena", 512, 512);
// wait for any key press
waitKey(0);
...