opencv——设置ROI区域

#include "stdafx.h"
#include<opencv2\opencv.hpp>
#include<opencv\cv.h>
#include <iostream>
#include<string>
 using namespace std;
 using namespace cv;


int _tmain(int argc, _TCHAR* argv[])
{
    IplImage *src=cvLoadImage("lena.jpg",-1);//读入图像  
    IplImage *dst;  
    CvRect ROI_rect_src;  
    CvRect ROI_rect_dst;  
    cvNamedWindow("src",CV_WINDOW_AUTOSIZE);  
    cvMoveWindow("src",200,200);  
    cvShowImage("src",src);//输出未定位ROI的图像  
    //cvWaitKey(0);  

    ROI_rect_src.x=src->width/2;  
    ROI_rect_src.y=src->height/2;  
    ROI_rect_src.width=200;  
    ROI_rect_src.height=200;  
    cvSetImageROI(src,ROI_rect_src);  
    cout<<"输出图像区域"<<endl;  
    cvSaveImage("ROI.bmp",src);
    
    cout<<(src->roi->xOffset)<<""<<(src->roi->yOffset)<<endl;  
    cout<<(src->roi->width)<<""<<(src->roi->height)<<endl;  
    cvShowImage("sr",src);//输出设定ROI以后的图像  
    //cvWaitKey(0);
    dst=cvCloneImage(src);//复制出ROI区域的图像  
    ROI_rect_dst=cvGetImageROI(src);//得到图像的ROI区域  
    cout<<"输出目标图像的ROI"<<endl;  
    cout<<ROI_rect_dst.x<<" "<<ROI_rect_dst.y<<endl;  
    cout<<ROI_rect_dst.width<<" "<<ROI_rect_dst.height<<endl;  
    cvNamedWindow("dst",CV_WINDOW_AUTOSIZE);  
    cvMoveWindow("dst",400,200);  
    cvShowImage("dst",dst);  
    cvWaitKey(0);  

    cvResetImageROI(dst);//释放目标图像的ROI  
    cvShowImage("dst",dst);  
    cvWaitKey(0);  
    cvReleaseImage(&src);  
    cvReleaseImage(&dst);  



    return 0;
}