[Insight-users] finding inverse deformation field

[Sara Rolfe]

Hello,

I'm using landmark warping following the example LandmarkWarping2.cxx  
to deform an image.  I'd now like to find vector field mapping the  
original image to the  warped image which is the inverse of the field  
produced.  I've tried using the itkInverseDeformationFieldImageFilter,  
but the results are very poor.  I am guessing this is because the  
resolution is too low, but with a subsampling factor of less than  
about 10, the computational time is very long.

Is there a better way to solve this problem?  Also, in practice,  
should results from itkInverseDeformationFieldImageFilter resemble the  
correct output, even with lower resolution?  I'm wondering if I could  
have something else wrong.

Thanks,
Sara