[ITK] Questions about ITK-Snap gaussian smoothing

[Beyer, Benedikt Alexander]

Dear ITK community,

I am currently writing an academic thesis at the RWTH Aachen University and I work with STL-data that is exported with ITK-Snap. A segmented structure is exported as an STL-file and then analyzed with VG Studio MAX. The data is used to determine measurement uncertainties created by gaussian filtering. To determine this uncertainty, I compare smoothed data to unsmoothed data.  I have a few questions regarding the gaussian image smoothing setting.


  1.  What gaussian filter algorithm does this option use? Eg. Recursive, discrete, robust, etc.
  2.  Is this filter a linear or surface filter?
  3.  How big is the gaussian kernel? Eg. 3x3, 5x5, etc.
  4.  What does the "approximation error max" option do? It has no visual effect on the segmentation.
  5.  There seems to be a threshold of the standard deviation at around 0.67. It seems that below this number no smoothing is applied. Is this specific to the program, or is this depended on the voxel size?
  6.  Are there any known influences on measurement uncertainty by gaussian smoothing?


Thank you in advance and with kind regards
Benedikt Beyer

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