[vtkusers] streaming images

[Dean Inglis]

Hi Mike,

not sure if this would work, but what about inserting vtkImageClip between
your reader
and the windowlevel filter in your pipeline with ClipDataOn?

- Dean


On Tue, Dec 13, 2016 at 12:20 PM, Mike Withascarf via vtkusers <
vtkusers at vtk.org> wrote:

> I have a pipeline that takes 3D image data (slices of 2D images) and
> displays it with a vtkImageViewer2 (with a slider to move through the
> slices). My datasets can get huge, so I am looking for a way to only load
> part of the image into memory at a time as needed. I tried using
> vtkImageDataStreamer without success, though I have a feeling that's not
> for image viewing, but rather processing. How can I accomplish what I'm
> trying to do? Any help is appreciated! Here is my basic code for loading
> and displaying the data:
>
> // load image data
> vtkSmartPointer<vtkMetaImageReader> reader = vtkSmartPointer<
> vtkMetaImageReader>::New();
> reader->SetReleaseDataFlag(1);
> reader->SetFileName("test.mhd");
>
> // colormap
> vtkSmartPointer<vtkLookupTable> lut = vtkSmartPointer<
> vtkLookupTable>::New();
> lut->SetNumberOfColors(256);
> lut->SetRange(0, 400);
> lut->Build();
> for (size_t i = 0; i < 256; i++)
> lut->SetTableValue(i, (double)i/256, (double)i/256, (double)i/256);
>
> vtkSmartPointer<vtkImageMapToColors> maptoc =
> vtkSmartPointer<vtkImageMapToColors>::New();
> maptoc->SetLookupTable(lut);
> maptoc->SetInputConnection(reader->GetOutputPort());
> maptoc->Update();
>
> // rendering
> viewer = vtkSmartPointer<vtkImageViewer2>::New();
> viewer->SetInputConnection(maptoc->GetOutputPort());
> viewer->SetRenderWindow(window->GetRenderWindow());
> viewer->GetRenderer()->ResetCamera();
> viewer->Render();
>
> // note that window is of type QVTKWidget
> // when the user changes slices, I call viewer->SetSlice
>
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