opencv下计算不变矩

#include "iostream"
using namespace std;

#include "cv.h"
#include "highgui.h"
const char* filename = "E:\\beichun_small.jpg"; 

int main(int argc, char* argv[])
{
  CvMoments moments;
  CvHuMoments hu_moments;

  IplImage* image = cvLoadImage(filename);
  if (!image)
  {   
    std::cout << "Failed cvLoadImage\n";
    return -1; 
  }   

  IplImage* gray = cvCreateImage(cvSize(image->width, image->height), image->depth, 1); 
  if (!gray)
  {   
    std::cout << "Failed cvCreateImage\n";
    return -1; 
  }   

  cvCvtColor(image, gray, CV_RGB2GRAY);

  cvMoments(gray, &moments, 0); 
  cvGetHuMoments(&moments, &hu_moments);
  cout << " " << hu_moments.hu1 <<
    "  " << hu_moments.hu2 <<
    "  " << hu_moments.hu3 <<
    "  " << hu_moments.hu4 <<
    "  " << hu_moments.hu5 <<
    " " << hu_moments.hu6 <<
    "  " << hu_moments.hu7 << ".\n";
  cvReleaseImage(&image);
  cvReleaseImage(&gray);
}

　　只是简单地针对一张图像计算不变矩，具体的原理还没看呢！呵呵！