Precalcular operaciones

## Info acá
https://docs.google.com/document/d/1-xMrVyuVWfOmHkUYfE_bg0ssuO6-4AJZEdLB5xTFyuw/edit#heading=h.je8p2aotvchd

Operaciones a precalcular

### normxcorr2
```
correlation = normxcorr2(template, img);
``` 

### normcdf
```
point = phiW .* (prod(alpha * normcdf(tmp), 1) / alpha);
``` 