//縮放圖像文件
#include <opencv2/opencv.hpp>
using namespace std;
//隱藏控制臺窗口
#pragma comment(linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"")
int main()
{
 const char *pstrImageName = "airplane.jpg";
 const char *pstrSaveImageName = "airplane縮放圖.jpg";
 const char *pstrWindowsSrcTitle = "原圖";
 const char *pstrWindowsDstTitle = "縮放圖";

 double fScale = 2;//縮放倍數(shù)
 CvSize czSize; //目標(biāo)圖像尺寸

 //從文件中讀取圖像 
 IplImage *pSrcImage = cvLoadImage(pstrImageName, CV_LOAD_IMAGE_UNCHANGED);
 IplImage *pDstImage = NULL; 

 //計算目標(biāo)圖像大小
 czSize.width = pSrcImage->width * fScale;
 czSize.height = pSrcImage->height * fScale;

 //創(chuàng)建圖像并縮放
 pDstImage = cvCreateImage(czSize, pSrcImage->depth, pSrcImage->nChannels);
 cvResize(pSrcImage, pDstImage, CV_INTER_AREA);
 

 //創(chuàng)建窗口
 cvNamedWindow(pstrWindowsSrcTitle, CV_WINDOW_AUTOSIZE);
 cvNamedWindow(pstrWindowsDstTitle, CV_WINDOW_AUTOSIZE);

 //在指定窗口中顯示圖像
 cvShowImage(pstrWindowsSrcTitle, pSrcImage);
 cvShowImage(pstrWindowsDstTitle, pDstImage);

 //等待按鍵事件
 cvWaitKey();

 //保存圖片
 cvSaveImage(pstrSaveImageName, pDstImage);

 cvDestroyWindow(pstrWindowsSrcTitle);
 cvDestroyWindow(pstrWindowsDstTitle);
 cvReleaseImage(&pSrcImage);
 cvReleaseImage(&pDstImage);
 return 0;
}