opencv cvPyrDown

#include "stdafx.h"
#include "highgui.h"
#include"cv.h"

IplImage * doPyrDown(
      IplImage * in
     // int filter = IPL_GAUSSIAN_5X5
      ){
      assert(in->width%2 == 0 && in->height%2 == 0);
       IplImage * out = cvCreateImage(
        cvSize( in->width/2, in->height/2 ),
        in->depth,
        in->nChannels
        );
       cvPyrDown( in, out,CV_GAUSSIAN_5x5);
       cvNamedWindow(  "haha1" ,1);
       cvShowImage( "haha1", out);
       cvWaitKey(0);
       cvSaveImage("d:/lena1.jpg", out);
       cvReleaseImage(&out);
       cvDestroyWindow("haha1");
       return( out );
};

 


int main(int argc,char ** argv)
{
 IplImage * img = cvLoadImage("lena.jpg");