[vtk-developers] problem using vtkcurvatures (akashlad)

[Andrew Maclean]

You might like to try an  indexed lookup table along with a banded contour
filter as in this example:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/CurvatureBandsWithGlyphs
This example also shows you how to generate a frequency table of the
curvatures which would be useful in this case.
Regards
    Andrew

From: akashlad <akash.milan22 at gmail.com>
> To: vtk-developers at vtk.org
> Cc:
> Date: Fri, 20 May 2016 06:52:57 -0700 (MST)
> Subject: [vtk-developers] problem using vtkcurvatures
> Hi everybody!
> i'm new to VTK and i'm trying to segment the brain sulci and gyri. i am
> using vtk on 3D slicer.
> the code that i wrote so far is :
>
> node=slicer.util.getNode('grey')
> vol=node.GetPolydata()
> curve=vtk.vtkCurvatures()
> curve.SetCurvatureTypeToMean()
> curve.SetInputData(vol)
> curve.Update()
> curved_vol=curve.GetOutput()
>
> th=vtk.vtkThreshold()
> th.SetInputData(curved_vol)
> th.thresholdByupper(0)
> th.Update()
>
> surf=vtk.vtkDataSetSurfaceFilter()
> surf.SetInputData(th.GetOutput())
> surf.Update()
> output_volume=surf.GetOutput()
>
> after applying the curvature my idea was to use a threshold filter to cut
> out the sulci from the model and obtain only the gyri.
> the problem is that the curvatures filter does not work very well with my
> model and i don't know why. the result that i get is this
> <
> http://vtk.1045678.n5.nabble.com/file/n5738159/13275218_10208217634112196_787516635_o.png
> >
>
> the problem is that the filter seems to not recognize well the gyri in
> respect to the sulci
> here you can find my model:
> https://www.dropbox.com/s/z99x7s7tj5is01a/grey.ply?dl=0
> So, basically, now the idea is to make the filter work on a major number of
> triangles of the model mesh, so that it won't recognise the small dips on
> the gyri. How could I do that?
> Thanks for any help!
>
> best regards
>
> Akash Lad
>
>  --
>
___________________________________________
Andrew J. P. Maclean

___________________________________________
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtk-developers/attachments/20160521/f43db19d/attachment.html>