OpenCV官方文档学习记录（10）

 1 #include <opencv2\opencv.hpp>
 2 #include <iostream>
 3 #include <string>
 4 
 5 #pragma comment( linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" )
 6 
 7 int MAX_KERNEL_LENGTH = 31;
 8 
 9 using namespace std;
10 using namespace cv;
11 
12 void Show(const std::string &name, const Mat &img)
13 {
14     namedWindow(name, CV_WINDOW_AUTOSIZE);
15     imshow(name, img);
16 }
17 
18 int main(void)
19 {
20     Mat img = imread("lena.jpg");
21     if (img.empty())
22         return -1;
23     Show("Source", img);
24     Mat tmp=img.clone();
25     Mat dst = tmp;
26 
27     pyrUp(tmp, dst, Size(tmp.rows * 2, tmp.cols * 2));
28     Show("Bigger", dst);
29 
30     pyrDown(tmp, dst, Size(tmp.rows / 2, tmp.cols / 2));
31     Show("Smaller", dst);
32     waitKey();
33     return 0;
34 }