[vtkusers] Set ImageData to zero

[Jothy]

Use GetScalarTypeAsString()

Jothy

On Wed, Sep 28, 2011 at 2:21 PM, speedy <markenjodsalz at gmx.net> wrote:

> Thanks a lot for your reply Dominique!
> It is much faster indeed to use GetScalarPointer() instead of iterating
> through the pixels. I still have a problem though: My class doesn't know
> the
> pixeltype of the image beforehand, but I have to cast the pointer to it.
> How
> can I achieve this? I know there's the method
>
> Image->GetScalarType(),
>
> but it returns an integer value and I don't know how to proceed with it..
>
>
> Dominique Töpfer wrote:
> >
> > Hi,
> >
> > a similar question was discussed here:
> >
> http://vtk.1045678.n5.nabble.com/Fast-element-access-of-vtkImageData-td4640137.html#none
> >
> > HTH
> > Dominique
> >
> > On 27.09.2011 15:47, speedy wrote:
> >> Sorry if this question actually has a simple answer, but what is the
> >> fastest
> >> way to set every pixel of a vtkImageData to zero (or any other value
> >> fitting
> >> in its pixeltype)?
> >> I've tried vtkImageThreshold, but it doesn't seem to do anything or
> maybe
> >> I
> >> am using it wrong:
> >>
> >>    threshold = vtkSmartPointer<vtkImageThreshold>::New();
> >>    threshold->SetInput(Image);
> >>    threshold->ReplaceOutOn();
> >>    threshold->SetOutValue(Value);
> >>    threshold->ThresholdByLower(maximum_image_value);
> >>    threshold->Update();
> >>
> >> --
> >> View this message in context:
> >>
> http://vtk.1045678.n5.nabble.com/Set-ImageData-to-zero-tp4845442p4845442.html
> >> Sent from the VTK - Users mailing list archive at Nabble.com.
> >> _______________________________________________
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> >>
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> >>
> >> Please keep messages on-topic and check the VTK FAQ at:
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> >
> >
> > --
> > Thus spake the master programmer:
> >      "After three days without programming, life becomes meaningless."
> >
> > -- The Tao of Programming by Geoffry James
> >
> > Dominique Töpfer, Dipl.-Inform.
> > Institute of Medical Physics
> > University of Erlangen
> >
> > _______________________________________________
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
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> >
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>
>
> --
> View this message in context:
> http://vtk.1045678.n5.nabble.com/Set-ImageData-to-zero-tp4845442p4849109.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
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-- 
Jothybasu K Selvaraj
PhD Student
University of Liverpool
Liverpool,UK
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