opencv - compare 2 histograms with Chi-Square -


i want compare 2 histograms, have 2 dimensions. want use chi-square-metric. comparator looks function:

double histogram::comparehistogram(histogram *hist){     double result=0;     double a=0;     double b=0;     (int y=0 ; y < bins_1 ; y++) {          (int x=0 ; x < bins_2 ; x++) {              a=gethistogramvalue(x,y)-hist->gethistogramvalue(x,y);              b=gethistogramvalue(x,y)+hist->gethistogramvalue(x,y);              if(fabs(b)>0.0){                result+=a*a/b;              }          }     }     return result; }

i've compared result result of opencv's cv::comparehist() function , different. don't know why.

before compared histograms, norm histograms minmax-norm. compared normed histogram normed histogram of opencv , equal. think, problem in comparehist function. where?

best regards,

the relevant section of source code opencv follows:

if( method == cv_comp_chisqr ) {     for( j = 0; j < len; j++ )     {         double = h1[j] - h2[j];         double b = h1[j];         if( fabs(b) > dbl_epsilon )             result += a*a/b;     } }

so can see difference in code line

b=gethistogramvalue(x,y)+hist->gethistogramvalue(x,y);

which should be

b=gethistogramvalue(x,y);

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