我调用opencv中的函数计算出的hu矩没有旋转、缩放不变性，请大家帮我看下程序哪出问题了。

#include
#include
#include

using namespace std;
using namespace cv;

int main(int argc, char *argv[])
{//读入图片预处理
Mat image=imread("F:\vs2010 project2\1.jpg");
//image.create(480, 640, CV_8UC1);
namedWindow("show", CV_WINDOW_AUTOSIZE);
imshow("show",image);
cvtColor(image,image,CV_BGR2GRAY);
Mat img2;
threshold(image,img2,100,255,CV_THRESH_BINARY);
//vector> contours;
// find
//findContours(img2,contours,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_NONE);
// draw
// Mat result(image.size(),CV_8U,Scalar(0));
//drawContours(result,contours,-1,Scalar(255),2);
//namedWindow("show2", CV_WINDOW_AUTOSIZE);
//imshow("show2",result);

//旋转缩放
cv::Point2f center = cv::Point2f(image.cols / 2, image.rows / 2); // 旋转中心

double angle = 0; // 旋转角度

double scale = 1.0; // 缩放尺度

cv::Mat rotateMat;   
rotateMat = cv::getRotationMatrix2D(center, angle, scale);  



cv::Mat rotateImg;  
cv::warpAffine(img2, rotateImg, rotateMat, image.size());  
cv::namedWindow("show2", CV_WINDOW_AUTOSIZE);
cv::imshow("show2",rotateImg);

//求HU矩

IplImage img3 = rotateImg;
cvShowImage("src",&img3);  
CvMoments moments;
CvHuMoments hu;
cvMoments(&img3,&moments,2); 
cvGetHuMoments(&moments, &hu);
//cout<<hu.hu1<<"/"<<hu.hu2<<"/"<<hu.hu3<<"/"<<hu.hu4<<"/"<<hu.hu5<<"/"<<hu.hu6<<"/"<<hu.hu7<<"/"<<"/"<<endl;
ofstream outfile;  
outfile.open("F:\\vs2010 project2\\tiquHU2\\hu.txt",ios::app); //存放数据的文件名  
if(outfile.is_open())  
{  
    outfile<<hu.hu1<<"/"<<hu.hu2<<"/"<<hu.hu3<<"/"<<hu.hu4<<"/"<<hu.hu5<<"/"<<hu.hu6<<"/"<<hu.hu7<<"/"<<"/"<<endl;  //写入数据  
     outfile.close();   
}  
else  
{  
   cout<<"不能打开文件!"<<endl;  
}  
cvWaitKey();

}

IplImage img3 = rotateImg;
cvShowImage("src",&img3);  
CvMoments moments;
CvHuMoments hu;
cvMoments(&img3,&moments,2); 
cvGetHuMoments(&moments, &hu);
//cout<<hu.hu1<<"/"<<hu.hu2<<"/"<<hu.hu3<<"/"<<hu.hu4<<"/"<<hu.hu5<<"/"<<hu.hu6<<"/"<<hu.hu7<<"/"<<"/"<<endl;
ofstream outfile;  
outfile.open("F:\\vs2010 project2\\tiquHU2\\hu.txt",ios::app); //存放数据的文件名  
if(outfile.is_open())  
{  
    outfile<<hu.hu1<<"/"<<hu.hu2<<"/"<<hu.hu3<<"/"<<hu.hu4<<"/"<<hu.hu5<<"/"<<hu.hu6<<"/"<<hu.hu7<<"/"<<"/"<<endl;  //写入数据  
     outfile.close();   
}  
else  
{  
   cout<<"不能打开文件!"<<endl;  
}  

cvWaitKey();

有问题