Masked cost functions

[nfaggian]

We need to add masking to the registration process, minimizing:

e = | M(W(I;p)) - M(T) |

where M is a masking function defined in the template space...

[riaanvddool]

Sounds good.

[riaanvddool]

I like this idea because we can generate a mask based on the features. So cost function only measures cost around points of interest instead of the whole image.

[riaanvddool]

Should work well with proposed SSIM metric as well, with SSIM being calculated for masked areas only.