[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;
}