二维相关

$$C\left(k,l\right)={\displaystyle \underset{米=0}{\overset{米-1}{\sum }}{\displaystyle \underset{n=0}{\overset{N-1}{\sum }}我1\left(米,n\right)\overline{我2}}\left(米+k,n+l\right)。}$$

$$\begin{array}{l}{C}_N\left(k,l\right)=\frac{{\displaystyle \underset{米=0}{\overset{米-1}{\sum }}{\displaystyle \underset{n=0}{\overset{N-1}{\sum }}我1\left(米,n\right)\overline{我2}}\left(米+k,n+l\right)}}{\sqrt{{\displaystyle \underset{米=0}{\overset{米-1}{\sum }}{\displaystyle \underset{n=0}{\overset{N-1}{\sum }}我1{\left(米,n\right)}^2}}}\sqrt{{\displaystyle \underset{米=0}{\overset{米-1}{\sum }}{\displaystyle \underset{n=0}{\overset{N-1}{\sum }}\overline{我2}{\left(米+k,n+l\right)}^2}}}},\\ \text{在那里,}\\ 0\le k<米+P-1\\ 0\le l<N+问-1\end{array}$$

$$\frac{\mathrm{585年}}{\sqrt{{\displaystyle \sum 我1_p^2}}\sqrt{{\displaystyle \sum 我2^2}}}=\mathrm{0.8070。}$$