Register cropped image to non-cropped image

[annareithmeir]

Task (what are you trying to do/register?)

I have a special case where one of the images of each image pair is cropped and the other is not. I am using the standard hypermorph framework. Naturally, the predicted deformation tries to map parts of the image domain of the non-cropped image to the image domain of the cropped image, which is not desired.

What have you tried

I tried to use a mask with zeros at the border locations and ones within the cropped image domain in the similarity and grad loss functions. However, no change occurs. I tried swapping the direction of registration (cropped -> non-cropped and other way round) and using the mask only in the similarity loss function. Still no improvement.

Ultimatively I am not interested in the deformation outside of the cropped image domain. How can I restrict the domain where the deformation is calculated?