# flipping transform in ITK

**URL:** <https://discourse.itk.org/t/flipping-transform-in-itk/437>\
**Category:** Algorithms\
**Created:** [November 20, 2017, 8:03pm UTC](https://discourse.itk.org/t/flipping-transform-in-itk/437 "2017-11-20T20:03:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![asertyuio](https://discourse.itk.org/letter_avatar_proxy/v4/letter/a/e68b1a/32.png) [@asertyuio](https://discourse.itk.org/u/asertyuio)\
**Post date:** [November 20, 2017, 8:03pm UTC](https://discourse.itk.org/t/flipping-transform-in-itk/437/1 "2017-11-20T20:03:41Z")

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Hi everyone,

Is there by any change a way of having a flipping, or mirroring transform ? A transform, not a filter. I have looking for it, but no match for now. As I’m working with 2D images, I’ve tried to use a 3D Euler Transform, with no success yet. Is there anything close in ITK, and if not, could it be not so difficult to implement ?

Thanks in advance !  
Yann

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**Author:** ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Post date:** [November 20, 2017, 9:34pm UTC](https://discourse.itk.org/t/flipping-transform-in-itk/437/2 "2017-11-20T21:34:41Z")

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You can use [resample](https://itk.org/Doxygen/html/classitk_1_1ResampleImageFilter.html) image filter, with an appropriate transform (which does the inversion). [Affine](https://itk.org/Doxygen/html/classitk_1_1AffineTransform.html) transform should be easy to construct, and there is a lot of documentation for it outside of ITK.

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<div class="post-metadata">

**Author:** ![asertyuio](https://discourse.itk.org/letter_avatar_proxy/v4/letter/a/e68b1a/32.png) [@asertyuio](https://discourse.itk.org/u/asertyuio)\
**Post date:** [November 21, 2017, 10:55am UTC](https://discourse.itk.org/t/flipping-transform-in-itk/437/3 "2017-11-21T10:55:58Z")

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Oh, thanks, I hadn’t thought about the affine transform for that.  
Thanks a lot @dzenanz !