I try to formulate the Zero-Mean Normalized Cross-Correlation in Einstein Notation. Thus without the Sigma's and with indices. I came up with the following but im not sure if the is correct and readable for others. What do you think?

$$ C_{nm} = \frac{(I_{ij}-\hat I)(T_{i+n,j+m}-\hat T)}{\sqrt{(I_{ij}-\hat I)^2}(T_{i+n,j+m}-\hat T)^2}$$

with Image $I_{ij}$, Template $T_{ij}$, Image mean $\hat I$ and template mean $\hat T$

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