使用opencv中匹配点对的坐标提取方式

在opencv中，特征检测、描述、匹配都有集成的函数。vector<DMatch> bestMatches;用来存储得到的匹配点对。那么如何提取出其中的坐标呢？

 int index1, index2;
 for (int i = 0; i < bestMatches.size(); i++)//将匹配的特征点坐标赋给point
 {
 index1 = bestMatches.at(i).queryIdx;
 index2 = bestMatches.at(i).trainIdx;
 
 cout << keyImg1.at(index1).pt.x << " "
    << keyImg1.at(index1).pt.y << " "
    << keyImg2.at(index2).pt.x << " "
    << keyImg2.at(index2).pt.y << endl;
 }

补充知识：OpenCV 如何获取一个连通域中的所有坐标点

#include "stdafx.h"
#include "cv.h"
#include "highgui.h"
#include "cxcore.h"
 
int main(int argc, char* argv[])
{
    IplImage* img;
    img = cvLoadImage("D:\\OOTT\\WEEK5\\2.png");
    IplImage* gray = cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);
    cvCvtColor(img,gray,CV_BGR2GRAY);
    cvThreshold(gray,gray,128,255,CV_THRESH_BINARY);
    CvMemStorage* storage = cvCreateMemStorage();
    CvSeq * first_contour = NULL;
    int Ncontour = cvFindContours(gray,storage,&first_contour,sizeof(CvContour),CV_RETR_LIST); 
    //Ncontour为cvFindContours函数返回的轮廓个数
    for(CvSeq* c = first_contour;c!= NULL;c=c->h_next)
    { 
    //    cvDrawContours(img,c,cvScalar(255,255,0),cvScalar(255,0,255),0,2,8);
        cvNamedWindow("contours",CV_WINDOW_AUTOSIZE);
    //    cvShowImage("contours",img);
        for(int k = 0;k <c->total;++k)
        {
            CvPoint* p = CV_GET_SEQ_ELEM(CvPoint,c,k);
            printf("(%d,%d)\n",p->x,p->y);
 
        }    
        CvRect rect;
        rect = cvBoundingRect(c,0);
        cvFloodFill(img,cvPoint(img->width/2,img->height/2),cvScalar(255,255,255),cvScalar(20),cvScalar(20),NULL,4,NULL);
       cvShowImage("contours",img); 
        
        int Num[500][500];
        for (int i=0;i<(img->height-5);i++)
            for (int j=0;j<(img->width-5);j++)
            {
                CvScalar S0;
                S0=cvGet2D(img,i,j);
                if(S0.val[0] == 255)
                    Num[i][j]=1;
                else
                    Num[i][j]=0;
         printf("(%d,%d)\n",i,j);
            }
 
    }
    cvWaitKey(0);
    cvReleaseImage(&img);
    cvReleaseImage(&gray);
    cvDestroyWindow("contours");
    return 0;
}

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