[ITK-users] [ITK] Generating a warping field with ThinPlateSplineKernelTransform

[Andras Lasso]

You can also load non-linear transforms into 3D Slicer for interactive visualization, application to your images, comparing fixed/moving/registered images, etc. You can also invert, compose, decompose transforms, apply it to marked points, segmented surfaces, etc.

See some examples here:
http://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/Modules/Transforms

Paraview is very good but not for analyzing transforms: it can only load exported displacement fields (but for that you would need to be sure that your region of interest is correct and you lose information when you sample the field), it only supports axis-aligned images, and dense vector field visualization has been broken in recent versions (I haven't checked the latest version).

Andras

-----Original Message-----
From: Community [mailto:community-bounces at itk.org] On Behalf Of Siavash Khallaghi
Sent: Tuesday, August 4, 2015 5:13 PM
To: insight-users at itk.org
Subject: Re: [ITK] [ITK-users] Generating a warping field with ThinPlateSplineKernelTransform

Having your exact code (on the small chance that it differs from the example), your data, and the argument list would help in debugging your problem. But in the mean time, you can try the following to see where the problem lies:

1. If you write out the defomation field and view it in the context of your volume in a 3rd party software (e.g., Paraview), what would you see? Would it make sense in terms of smoothness and direction?

2. Is the deformed volume (output of itk::ResmapleImageFilter) different compared to the input volume? In other words, is the resampler doing anything?

3. If you invert the deformation field, would your deformed volume be the output that you expect? You can do this by swapping source and target landmarks.

Siavash



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