#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/nonfree/features2d.hpp> //
#include <opencv2/imgproc/imgproc.hpp> // resize()
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, const char *argv[]){
Mat big = imread("imgs/linux.jpg",-1);//CV_LOAD_IMAGE_ANYDEPTH);// the big pic
Mat dst = imread("imgs/200X200.jpg", -1);
cout << "Mat info:" << endl;
cout << "Original pic," << big.rows << " : "<< big.cols << endl;
cout << "dst pic, " << dst.rows << " : "<< dst.cols << endl;
Size s = big.size();
cout << "Pic Size info:" << endl;
cout << "Original pic," << s.width << " : "<< s.height << endl;
s = dst.size();
cout << "dst pic," << s.width << " : "<< s.height << endl;
// resize big to dst
cv::resize(big, dst, dst.size());
// show it on an image
imshow("big", big);
imshow("test", dst);
waitKey(0);
return 0;
}原文地址:http://blog.csdn.net/vonzhoufz/article/details/45671249