# Slicer level tracing, itk::LevelTracingImageFilter

**URL:** <https://discourse.slicer.org/t/slicer-level-tracing-itk-leveltracingimagefilter/24269>\
**Category:** Support\
**Created:** [July 11, 2022, 10:28am UTC](https://discourse.slicer.org/t/slicer-level-tracing-itk-leveltracingimagefilter/24269 "2022-07-11T10:28:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Eleonora\_Tiribilli](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/eleonora_tiribilli/32/12875_2.png) [@Eleonora\_Tiribilli](https://discourse.slicer.org/u/Eleonora_Tiribilli)\
**Post date:** [July 11, 2022, 10:28am UTC](https://discourse.slicer.org/t/slicer-level-tracing-itk-leveltracingimagefilter/24269/1 "2022-07-11T10:28:36Z")

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Someone knows how the _ **itk::LevelTracingImageFilter** _ works?

I found only the header file, with no explanation [Slicer/itkLevelTracingImageFilter.h at main · Slicer/Slicer · GitHub](https://github.com/Slicer/Slicer/blob/main/Libs/vtkITK/itkLevelTracingImageFilter.h)

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**Author:** ![Andinet\_Enquobahrie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/andinet_enquobahrie/32/75_2.png) [@Andinet\_Enquobahrie](https://discourse.slicer.org/u/Andinet_Enquobahrie)\
**Post date:** [July 11, 2022, 11:12am UTC](https://discourse.slicer.org/t/slicer-level-tracing-itk-leveltracingimagefilter/24269/2 "2022-07-11T11:12:45Z")

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The header file comment provides an explanation

> <https://github.com/Slicer/Slicer/blob/main/Libs/vtkITK/itkLevelTracingImageFilter.h#L12-L27>

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**Author:** ![Andinet\_Enquobahrie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/andinet_enquobahrie/32/75_2.png) [@Andinet\_Enquobahrie](https://discourse.slicer.org/u/Andinet_Enquobahrie)\
**Post date:** [July 11, 2022, 11:18am UTC](https://discourse.slicer.org/t/slicer-level-tracing-itk-leveltracingimagefilter/24269/3 "2022-07-11T11:18:01Z")

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It is one of the editor effects in the Segment Editor

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/0/e0311ed517fbcfa9ad8eb6c6283b0caa9b6de6ea.jpeg)