NMI特征识别

该特征具有 放大、缩小、旋转抗灰度巨变 不变性。能够达到实时性要求
writen by wqj1212@yahoo.com.cn

double CRecognise::recogniseNMI(IplImage *src)
{ 
    IplImage *src1;
    int width;
     int height;
    width=src->width;
    height=src->height;
    int i,j;
double cx=0.0;double cy=0.0; J=0.0;double M=0.0;
src1=cvCreateImage(cvSize(src->width,src->height),src->depth,1);
if((src->nChannels)!=1)
{    cvCvtColor(src,src1,CV_BGR2GRAY);
}
else
//cvCopy(src,src1);
src1=(IplImage *)cvClone(src);
//cvAdaptiveThreshold(src1,src1,1,CV_ADAPTIVE_THRESH_GAUSSIAN_C,CV_THRESH_BINARY ,5);
for(j=1;j<=height;j++)
    
        for(i=1;i<=width;i++)
        {

            
            M+=(float)CV_IMAGE_ELEM(src1,uchar,j,i);
            cx+=i*CV_IMAGE_ELEM(src1,uchar,j,i);
            cy+=j*CV_IMAGE_ELEM(src1,uchar,j,i);
    
            
        }
        
     cx/=M;
     cy/=M;

     for(j=1;j<=height;j++)
         for( i=1;i<width;i++)
         {
             J+=((i-cx)*(i-cx)+(j-cy)*(j-cy))*((float)CV_IMAGE_ELEM(src1,uchar,j,i));
         }
    J=sqrt(J)/M;
    return J;
    
}