[vtkusers] iterating through vtkImageStencilData

[Prathamesh Kulkarni]

I find it very complicated to port into my code. All I need to do is to
write the pixel values corresponding to the stencil into a text file (in any
order). I tried getting the extent of the stencil by:

vtkImplicitFunctionToImageData->GetExtent(); but this gives me the whole
extent of the InformationInput (vtkImageData). Isn't there a simple way to
do this? My idea is to iterate over vtkImageData using extent of the
stencil. Is this a good/viable idea?

Prathmesh

On Wed, Jul 21, 2010 at 9:40 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Prathamesh,
>
> Take a look at the code for the filters that use vtkImageStencilData,
> for example see vtkImageAccumulate.cxx at line 200.  The
> vtkImageStencilData does not store the raw pixel data.  It uses a form
> of run-length encoding instead.
>
>  David
>
>
> On Wed, Jul 21, 2010 at 8:31 AM, Prathamesh Kulkarni
> <prathameshmkulkarni at gmail.com> wrote:
> > Hi David,
> >
> > Thanks for the direction. The documentation does not make it very clear
> to
> > me. Could you please point/cook me a little example for accessing pixel
> > values of vtkImageStencilData using the method you suggested? If I am
> able
> > to do it, I'll post it out.
> >
> >
> > Prathamesh
> >
> > On Tue, Jul 20, 2010 at 6:34 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> >>
> >> Hi Prathamesh,
> >>
> >> You can use the following method of vtkImageStencilData to do the
> >> iteration:
> >>
> >>  int vtkImageStencilData::GetNextExtent(int &r1, int &r2, int xMin,
> >>            int xMax, int yIdx, int zIdx, int &iter);
> >>
> >> The documentation describes what each of the parameters is for.  I
> >> started work on a proper iterator for vtkImageStencilData many, many
> >> years ago but never found time to finish it.
> >>
> >>  David
> >>
> >>
> >> On Tue, Jul 20, 2010 at 5:00 PM, Prathamesh Kulkarni
> >> <prathameshmkulkarni at gmail.com> wrote:
> >> > Hello all,
> >> >
> >> > I want to be able to write vtkImageStencilData to text files in a CSV
> >> > format
> >> > in order to be analyzed in some other software.
> >> >
> >> > I could not find a way to iterate through vtkImageStencilData similar
> to
> >> > vtkImageData.
> >> >
> >> > One idea is to convert the vtkImageStencilData to vtkImageData and
> then
> >> > use
> >> > vtkImageIterator. However, I do not know how to perform this
> conversion.
> >> >
> >> > Has anyone tried this before? How?
> >> >
> >> > Thanks,
> >> > Prathamesh
> >> >
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