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FIX: Remove "densification" of B-Spline transforms in apply() #280

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merged 1 commit into from
Aug 15, 2025
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FIX: Remove "densification" of B-Spline transforms in apply() #280

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22 changes: 7 additions & 15 deletions nitransforms/resampling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -259,22 +259,14 @@ def apply(
targets = None
ref_ndcoords = _ref.ndcoords

if hasattr(transform, "to_field") and callable(transform.to_field):
targets = ImageGrid(spatialimage).index(
_as_homogeneous(
transform.to_field(reference=reference).map(ref_ndcoords),
dim=_ref.ndim,
)
)
else:
# Targets' shape is (Nt, 3, Nv) with Nv = Num. voxels, Nt = Num. timepoints.
targets = (
ImageGrid(spatialimage).index(
_as_homogeneous(transform.map(ref_ndcoords), dim=_ref.ndim)
)
if targets is None
else targets
# Targets' shape is (Nt, 3, Nv) with Nv = Num. voxels, Nt = Num. timepoints.
targets = (
ImageGrid(spatialimage).index(
_as_homogeneous(transform.map(ref_ndcoords), dim=_ref.ndim)
)
if targets is None
else targets
)

if targets.ndim == 2:
targets = targets.T[np.newaxis, ...]
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