# How can I approximate the Noise Reduction Non-Local Means in Amira?

**URL:** <https://discourse.slicer.org/t/how-can-i-approximate-the-noise-reduction-non-local-means-in-amira/32559>\
**Category:** Support\
**Created:** [November 2, 2023, 2:22pm UTC](https://discourse.slicer.org/t/how-can-i-approximate-the-noise-reduction-non-local-means-in-amira/32559 "2023-11-02T14:22:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tan/32/68126_2.png) [@Tan](https://discourse.slicer.org/u/Tan)\
**Post date:** [November 2, 2023, 2:22pm UTC](https://discourse.slicer.org/t/how-can-i-approximate-the-noise-reduction-non-local-means-in-amira/32559/1 "2023-11-02T14:22:45Z")

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I’ve tried in-build four denoising tools for my micro-ct data, but the results were not ideal. Sometimes the results are even mixed with noise outside the organization. This is my default setting in Amira. How should I approximate the same function? Thanks.  
 ![default](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/b/cb668841c4531536ae7f65faf920593b1055248e.png)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [November 2, 2023, 2:39pm UTC](https://discourse.slicer.org/t/how-can-i-approximate-the-noise-reduction-non-local-means-in-amira/32559/2 "2023-11-02T14:39:48Z")

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`Simple Filters` module provides many noise reduction filters. For example, there is a non-local means filter called `PatchBasedDenoisingImageFilter`. You can find its documentation [here](https://itk.org/Doxygen/html/classitk_1_1PatchBasedDenoisingImageFilter.html). There are a lot of things to scroll through, but you should be able to find description of the method and exaplanation of all its parameters. If something is not clear about the algorithm or you would need advice on other image noise reduction filters then you can ask on the [ITK forum](https://discourse.itk.org/).

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**Author:** ![Tan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tan/32/68126_2.png) [@Tan](https://discourse.slicer.org/u/Tan)\
**Post date:** [November 3, 2023, 3:08am UTC](https://discourse.slicer.org/t/how-can-i-approximate-the-noise-reduction-non-local-means-in-amira/32559/3 "2023-11-03T03:08:40Z")

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Thank you for your help! I’ll try it.