[学习OpenCV攻略][007][缩小图片]

cvPryDown(输入图片,输出图片)

根据输出图片的大小，把输入图片进行压缩

cvPryUp(输入图片,输出图片)

根据输出图片的大小，把输入图片进行放大

#include "cv.h"
#include "highgui.h"
 
IplImage *doPyrUp(IplImage *in){
    //assert(in->width%2 == 0 && in->height%2 == 0);
     
    //IplImage *out = cvCreateImage(cvSize(in->width/2, in->height/2), in->depth, in->nChannels);
    IplImage *out = cvCreateImage(cvSize(in->width*2, in->height*2), in->depth, in->nChannels);
     
    //cvPyrDown(in, out);
    cvPyrUp(in, out);
     
    return out;
}
 
int main(int argc, char **argv){
    IplImage *img = cvLoadImage(argv[1]);
    //IplImage *img2 = cvCreateImage(cvSize(img->width/2, img->height/2), img->depth, img->nChannels);
    IplImage *img2 = cvCreateImage(cvSize(img->width*2, img->height*2), img->depth, img->nChannels);
     
    cvNamedWindow("hello1", CV_WINDOW_AUTOSIZE);
    cvNamedWindow("hello2", CV_WINDOW_AUTOSIZE);
    cvShowImage("hello1", img);
     
    //img2 = doPyrDown(img);
    img2 = doPyrUp(img);
     
    cvShowImage("hello2", img2);
     
    cvWaitKey(0);
     
    cvReleaseImage(&img);
    cvReleaseImage(&img2);
    cvDestroyWindow("hello1");
    cvDestroyWindow("hello2");
     
    return 0;
}