用opencv改变图片大小（像素、尺寸）

#include "cv.h"
#include "highgui.h"
#include "stdio.h"

int main(int argc,char *argv[])
{
IplImage *image=0,*imageresize=0;
image=cvLoadImage("lena.jpg",1);
if(!image) printf("can't load an image/n");
imageresize=cvCreateImage(cvSize(1000,750),IPL_DEPTH_8U,3);
cvResize(image,imageresize,CV_INTER_LINEAR);
cvNamedWindow("lena",1);
cvNamedWindow("size",1);
cvShowImage("size",imageresize);
cvShowImage("lena",image);
cvWaitKey(0);
cvReleaseImage(&image);
cvReleaseImage(&imageresize);
cvDestroyWindow("size");
cvDestroyWindow("lena");
return 0;
}