[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;
}