[Insight-developers] itk::ImageBase::TransformIndexToPhysicalPoint/TransformPointToContinuousIndex ignores spacing?

[kent williams]

Sorry to keep posting up my moment to moment travails with the
WarpImageFilter, I'll shut up after this post.

Yes, it appears that the spacing is in fact being honored in the conversion
from/to physical points.

My problem came not from spacing being ignored, but apparently, rounding
issues, or 'center of voxel' issues, or something. To wit

Output Image: size = { 16, 16, 16 }, spacing = { 1, 1, 1 }
Deformation Field: size = { 8, 8, 8 }, spacing = { 2, 2, 2 }

result of Output->TransformIndexToPhysicalPoint = { 15, 0, 0 }
result of DefField->TranformPhysicalPointToContinuousIndex = { 7.5, 0, 0 }
result of DefField->IsInsideBuffer({7.5, 0, 0 }) = FALSE.

That is because the maximum continuous index in the DefField is { 7, 0, 0 }




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