//功能：使用pytDown()函数把图片的大小减半 pytDown:上采样 ； pryUp(下采样)
//上采样函数，使得图像像素的行列均减半
//下采样则加倍
#include "stdafx.h"
#include<opencv2/opencv.hpp>
#include<iostream>
using namespace cv;
using namespace std;
int main(int argc,char ** argv)
{
Mat img1, img2,img3;
namedWindow("原始图片窗口",WINDOW_AUTOSIZE);
namedWindow("减半图片窗口", WINDOW_AUTOSIZE);
namedWindow("翻倍图片窗口", WINDOW_AUTOSIZE);
img1 = imread("D:\\picture\\lena.png");
imshow("原始图片窗口",img1);
cout<<img1.size<<endl;
pyrDown(img1,img2);
cout << img2.size << endl;
imshow("减半图片窗口", img2);
pyrUp(img1, img3);
cout << img3.size << endl;
imshow("翻倍图片窗口", img3);
waitKey(0);
return 0;
}
