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frangi vesselness filter hangs #243

@kayarre

Description

@kayarre

running the command,
vmtkimagevesselenhancement -ifile DSA.nrrd -method frangi -sigmamin 1.0 -sigmamax 6.0 -sigmasteps 5 -stepmethod 'logarithmic' -scaled 1 -alpha 0.5 -beta 0.5 -gamma 0.5 -ofile DSA_frangi.nrrd

the code appears to hang forever, and is driving all the processors at a high load, I killed it after a couple of hours. using the vmtkslicerextension doesn't hang forever. I tried profiling, but it looks like its spending all the time in waitpid.
unsure how to proceed.

python3.6 (latest from anaconda distribution)
vmtk master (clean build as of yesterday)
ubuntu 16.04 on 24 core AMD machine

git log -n 4
commit 927a5739a5968b9827888bb6b6d183be8d53b6cf
Merge: 9b73002 002f77f
Author: Rick Izzo <[email protected]>
Date:   Tue Feb 20 00:16:41 2018 -0500

    Merge pull request #241 from rlizzo/fix-script-name
    
    fixed set script name error

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