void ChanMean (WinSize, r0,c0, Ch0,Ch1,Ch2, m0,m1,m2)
int   WinSize, r0,c0;
BYTE  ** Ch0;
BYTE  ** Ch1;
BYTE  ** Ch2;
float *m0,*m1,*m2;
{
   int  r,c,N;

   N = WinSize*WinSize;
   *m0 = *m1 = *m2 = (float)0;
   for (r=r0; r<r0+WinSize; r++) {
      for (c=c0; c<c0+WinSize; c++) {
         *m0 += (float)Ch0 [r][c];
         *m1 += (float)Ch1 [r][c];
         *m2 += (float)Ch2 [r][c];
   }  }
   *m0 /= N;
   *m1 /= N;
   *m2 /= N;
}
