transform_from_displacement_field does not return anything

I’m using ANTsPy 0.2.0 downloaded as a .whl from the releases page.

It seems currently that there is no way to load a deformable transform (saved as the result of a registration) into a transform object. The function transform_from_displacement_field appears it should convert such a deformation field loaded as an image into one of these transforms - but currently it just returns None.

Is there a way to load a displacement field (So I can do things like transform.apply_to_point with my deformation field)?

[ntustison]

Hey @stnava , just ran into this in trying to port my ported ANTsR version of your data augmentation code (currently in ANTsPyNet). Linear works and the simulated displacement field stuff is there but the displacement field-to-transform part is lacking. After the busy part of this week is over, I’ll probably revisit this and might bug you for some more information.

[stnava]

One of the notebook examples illustrates how to use that and the version for transforming points

On Wed, Oct 2, 2019 at 6:10 PM brian avants [e-mail] wrote:

See ants.apply_transforms

On Wed, Oct 2, 2019 at 5:55 PM reynoldscem [e-mail] wrote:

Sorry I think our wires are crossed here. The transforms are on disk, stored as Warp.nii.gz files. The problem is that I cannot load & convert them into the format which the apply_* functions want.

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brian