I want to perform an image resize using bicubic interpolation. However, my output image, new_img looks exactly the same as my original loaded image, img. Also, when I found the width and height of new_img, it has the same dimensions as my original image. I thought that the destination image was supposed to have been resized? This is my code. Would someone see if I have done anything inaccurately please? Thank you in advance.
#include "cv.h"
#include "highgui.h"
#include "iostream"
using namespace std;
int main( int argc, char* argv ) {
IplImage* img = NULL;
const int maxScale = 1;
img = cvLoadImage("C:\\walk mii.jpg");
if (!img){return -1;}
for(int s = 1; s <= maxScale; s++)
{
IplImage* new_img = img;
if( s > 1 ) {
new_img = cvCreateImage(cvSize(img->width*s,img->height*s), img->depth, img->nChannels );
cvResize( img, new_img, CV_INTER_CUBIC );}
cvNamedWindow( "original", CV_WINDOW_AUTOSIZE );
cvShowImage( "original", img);
cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );
cvShowImage( "result", new_img);
CvSize dim = cvGetSize(new_img);
cout <<" dimensions:: height:" << dim.height<<" width:"<< dim.width<< endl;
cvWaitKey(0);
cvReleaseImage( &img );
cvReleaseImage( &new_img );
cvDestroyWindow( "result" );
return 0;
}
}
Altered code:
#include "cv.h"
#include "highgui.h"
#include "iostream"
using namespace std;
int main( int argc, char* argv ) {
IplImage* img = NULL;
IplImage* new_img = NULL;
img = cvLoadImage("C:\\walk mii.jpg");
if (!img){
return -1;}
new_img = cvCreateImage(cvSize(img->width,img->height), img->depth, img->nChannels );
cvResize( img, new_img, CV_INTER_CUBIC );
cvNamedWindow( "original", CV_WINDOW_AUTOSIZE );
cvShowImage( "original", img);
cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );
cvShowImage( "result", new_img);
CvSize dim = cvGetSize(new_img);
cout <<" dimensions:: height:" << dim.height<<" width:"<< dim.width<< endl;
cvWaitKey(0);
cvReleaseImage( &img );
cvReleaseImage( &new_img );
cvDestroyWindow( "result" );
return 0;
}
IplImage* new_img = img;
does a shallow copy so new_img and img point to the same data