$\begin{array}{ccc}& c{m}_{dx,dy}^H(a,b)={\displaystyle \sum _{x=1}^{n-1}}{\displaystyle \sum _{y=x+1}^n}\{\begin{array}{cc}& I(x,y)=a\\ 1,& and\\ & I(x+dx,y+dy)=b\\ 0,& otherwise\end{array}\phantom{\}}\hfill & \hfill \text{(10)}\end{array}$