Matrix Indexing please help?

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Main Question or Discussion Point

Hello there today I have mostly been looking at matrix indexing, thats for all the fast show fans out there, and I have come across something I cant quite get my head around. I have been looking at using normalised cross correlation to find the simularity within different images. I think I understand most of the mathematics but the equation reads:
y(u,v)=xsumn,ysumn,f(x,y).t(x-u,y-v)
I cant understand the matrix index method here. Its probably really simple and so obvious that I will have to go into hiding for 6 months. My initial thoughts where that it would mean that you would always strat at the origin of the template, but this doesnt work for anything greater than f. Can some please help me?
Cheers
Physical101
 

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