opencv深入学习（5）—ROI区域

#include "stdafx.h"
#include "highgui.h"
#include "cv.h"
#include <iostream>
using namespace std;
using namespace cv;

void main()
{
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;
cout<<(src->roi->xOffset)<<""<<(src->roi->yOffset)<<endl;
cout<<(src->roi->width)<<""<<(src->roi->height)<<endl;
cvShowImage("src",src);//输出设定ROI以后的图像

dst=cvCloneImage(src);//复制出ROI区域的图像
ROI_rect_dst=cvGetImageROI(dst);//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);
}