displayImage.cpp

/*******************************************************************
 This is a simple MEX file. It just calls openCV functions for loading,
 smothing and diaplaying the results
********************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <cv.h>
#include <highgui.h>
#include <cxcore.h>

#include "mex.h"

int smoothImage(char* filename){

//load the image
IplImage* img = cvLoadImage(filename);
if(!img){
printf("Cannot load image file: %s\n",filename);
return -1;
}

//create another image
IplImage* img_smooth = cvCloneImage(img);

//smooth the image img and save the result to img_smooth
cvSmooth(img, img_smooth, CV_GAUSSIAN, 5, 5);

// create windows to show images
cvNamedWindow("Original Image", CV_WINDOW_AUTOSIZE);
cvMoveWindow("Original Image", 100, 100);
cvNamedWindow("Smoothed Image", CV_WINDOW_AUTOSIZE);
cvMoveWindow("Smoothed Image", 400, 400);

// show the images
cvShowImage("Original Image", img );
cvShowImage("Smoothed Image", img_smooth );


// wait for a key
cvWaitKey(0);

//destroy windows
cvDestroyWindow("Original Image");
cvDestroyWindow("Smoothed Image");

//release images
cvReleaseImage(& img);
cvReleaseImage(& img_smooth);

return 0;
};

void mexFunction(int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[]){

if (nrhs != 0)
{
mexErrMsgTxt("Do not give input arguments.");
}
if (nlhs != 0)
{
mexErrMsgTxt("Do not give output arguments.");
}

char *name = "cameraman.png";

smoothImage(name);

}