计算二值图像的重心坐标并绘制重心

#include "cv.h"

#include "highgui.h"
using namespace std;
int main()
{   //定义二值图像
IplImage *img = cvLoadImage("spot.JPG",0);
cvNamedWindow("img"); cvShowImage("img", img);
// 计算重心
CvMoments *moments = (CvMoments*)malloc(sizeof(CvMoments));
cvMoments(img, moments, 1);   // The actual moment values 
double moment10 = cvGetSpatialMoment(moments, 1, 0);
double moment01 = cvGetSpatialMoment(moments, 0, 1);
double area = cvGetSpatialMoment(moments, 0, 0);
double posX = moment10 / area;
double posY = moment01 / area;
//显示并绘制重心
CvPoint center; center.x = int(posX); center.y = int(posY);
    cout << "x= " << center.x << "; y= " << center.y << endl;
cvCircle(img, center, 3, CV_RGB(120, 150, 100),1,8,0);
cvNamedWindow("result"); cvShowImage("result", img);
//cvSaveImage("2.JPG", img);
cvWaitKey(0);
cvDestroyAllWindows();
return 0;

}