Qt–OpenCV : Hello image display in the screen

After successfully configuring your Qt-Creator with OpenCV library, its now time to get your hands dirty with the openCV programming. Here I have created a simple sample program which loads the picture from your drive named hello.jpg. It’s really simple .

Here is the code for main.cpp

#include <opencv/cv.h>
#include <opencv/highgui.h>
#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[]){   
  	QApplication a(argc, argv);    
	MainWindow w;    
	w.show();  
	IplImage* img = cvLoadImage( "C:\hello.jpg" ); 

 	//load the image     
	cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );  
	cvShowImage( "Example1", img ); 
	cvWaitKey(0);  
	cvReleaseImage( &img );  
	cvDestroyWindow( "Example1" ); 
	return a.exec();
}

You will get output like this…

You can download the above project for OpenCV2.2 here.