[vtkusers] displaying histogram using vtkImageAccumulate

[David Gobbi]

Hi Prathamesh,

The output of vtkImageAccumulate must be plotted in order to show the histogram:
http://www.vtk.org/Wiki/VTK/Examples/Images/HistogramXYPlot

  David



On Tue, Jul 20, 2010 at 8:44 AM, Prathamesh Kulkarni
<prathameshmkulkarni at gmail.com> wrote:
>
> Hello all,
>
> I want to be able to display histogram of a part of an image. Following is
> what I did so far:
>
> image_accumulate->SetInput(vtkImageData);
> image_accumulate->SetStencil(vtkImageStencilData);
> image_accumulate->Update();
>
> histogram_image = image_accumulate->GetOutput();
> histogram_image->Update();
>
>
> When I cast the histogram image to unsigned char and render it using
> vtkImageActor, I see a blank white image. Am I missing something here?
>
>
> Thanks,
> Prathamesh
>
>
>
>
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