# make output deformation smooth
**URL:** https://discourse.itk.org/t/make-output-deformation-smooth/921
**Category:** Uncategorized
**Created:** [May 11, 2018, 1:20pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921 "2018-05-11T13:20:13Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Borda](https://discourse.itk.org/u/Borda)
#### Post date: [May 11, 2018, 1:20pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/1 "2018-05-11T13:20:13Z")
Hello, I would like to ask if there is a way how to make output deformation smooth fro further image warping. I was using Demon registration which gives me quite a wild deformation… see [GitHub-SimpleITK](https://github.com/SimpleITK/SimpleITK/issues/465#issuecomment-388041447)
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### Author:  [@blowekamp](https://discourse.itk.org/u/blowekamp)
#### Post date: [May 11, 2018, 5:26pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/4 "2018-05-11T17:26:07Z")
Have you tries the diffeomorphic version of demons registration: [https://itk.org/SimpleITKDoxygen/html/classitk\_1\_1simple\_1\_1DiffeomorphicDemonsRegistrationFilter.html](https://itk.org/SimpleITKDoxygen/html/classitk_1_1simple_1_1DiffeomorphicDemonsRegistrationFilter.html)
That version is guaranteed to be invertible.
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### Author:  [@Borda](https://discourse.itk.org/u/Borda)
#### Post date: [May 11, 2018, 5:46pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/5 "2018-05-11T17:46:52Z")
well, it is significantly better but still there is discontinuity… how can I upload an image to show it?
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### Author:  [@blowekamp](https://discourse.itk.org/u/blowekamp)
#### Post date: [May 11, 2018, 6:09pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/6 "2018-05-11T18:09:18Z")
When you hit reply what does it say?
Have you tried pasting an image?
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### Author:  [@Borda](https://discourse.itk.org/u/Borda)
#### Post date: [May 11, 2018, 9:12pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/7 "2018-05-11T21:12:33Z")
the original deformations
inverse using `InverseDisplacementField`
inverse using `InvertDisplacementFieldImageFilter`
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### Author:  [@blowekamp](https://discourse.itk.org/u/blowekamp)
#### Post date: [May 11, 2018, 9:29pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/8 "2018-05-11T21:29:49Z")
Could you also visualize these by resampling a grid? There should be a grid image source filter to help.
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### Author:  [@blowekamp](https://discourse.itk.org/u/blowekamp)
#### Post date: [May 11, 2018, 9:41pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/9 "2018-05-11T21:41:20Z")
There is also the iterative inverse: [https://itk.org/SimpleITKDoxygen/html/classitk\_1\_1simple\_1\_1IterativeInverseDisplacementFieldImageFilter.html](https://itk.org/SimpleITKDoxygen/html/classitk_1_1simple_1_1IterativeInverseDisplacementFieldImageFilter.html)
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### Author:  [@lassoan](https://discourse.itk.org/u/lassoan)
#### Post date: [May 13, 2018, 12:47pm UTC](https://discourse.itk.org/t/make-output-deformation-smooth/921/10 "2018-05-13T12:47:18Z")
To assess displacement fields, you can drag-and-drop the image and ITK transform file to 3D Slicer, go to [Transforms module](https://www.slicer.org/wiki/Documentation/Nightly/Modules/Transforms#Transform_display_options), and enable 2D and/or 3D visibility in Display section.
