关于CvMoments的一些剖析

#include "cv.h" 
#include "highgui.h" 
#include "cvaux.h"
#include "cxcore.h"
#include <stdio.h>
#include <vector>
using namespace std;
using namespace cv;

void main()
{
	CvMemStorage* storage_r= cvCreateMemStorage(0);
	CvSeq* seq_r= cvCreateSeq(CV_32FC2, sizeof(CvSeq), sizeof(CvPoint2D32f), storage_r);

	cvSeqPush(seq_r, &cvPoint2D32f(0,50));
	cvSeqPush(seq_r, &cvPoint2D32f(-50,0));
	cvSeqPush(seq_r, &cvPoint2D32f(50,0));
	cvSeqPush(seq_r, &cvPoint2D32f(0,-50));

	double m00, m10, m01;
	CvMoments moment;
	cvMoments(seq_r, &moment, 0);
	
	m00 = cvGetSpatialMoment( &moment, 0, 0 );
	m10 = cvGetSpatialMoment( &moment, 1, 0 );
	m01 = cvGetSpatialMoment( &moment, 0, 1 );

	float x = (float) (m10/m00);
	float y = (float) (m01/m00);
	return;
}

 

证明了用cvGetCentralMoment获得的重心无需再加上坐标原点，它是与序列中的点保持一致的

m00=0表示f(x,y)是对称的，即关于中心对称