Hi Felix,
your code looks good, but in the end some information is missing. You set the
LUT to the LookupTableProperty and do you set the LookupTableProperty to the
respective Data Node?
I did something similar (with LUT) for surfaces, maybe you want to try setting
the properties in your DataNode.
mitk::LookupTable::Pointer mitkLut = mitk::LookupTable::New();
mitkLut->SetVtkLookupTable(vtkLut);
mitk::LookupTableProperty::Pointer mitkLutProp =
mitk::LookupTableProperty::New(mitkLut);
mitk::DataNode::Pointer resultSurfaceNode = mitk::DataNode::New();
resultSurfaceNode->SetProperty( "LookupTable", mitkLutProp);
resultSurfaceNode->SetBoolProperty("use color",false);
resultSurfaceNode->SetBoolProperty("scalar visibility", true);
resultSurfaceNode->SetFloatProperty("ScalarsRangeMaximum", max);
resultSurfaceNode->SetFloatProperty("ScalarsRangeMinimum", min);
resultSurfaceNode->SetData(resultSurface);
resultSurfaceNode->SetName("ResultSurface");
resultSurfaceNode->Update();
this->GetDataStorage()->Add(resultSurfaceNode);
Let me know if this helps you, if not I need to investigate this issue in
detail.
Best regards
Sven
Von: Félix C. Morency [mailto:[email protected]]
Gesendet: Freitag, 15. Februar 2013 17:51
An: [email protected]
Betreff: [mitk-users] LUT and LevelWindow to highlight voxel range
Hi list,
I am trying to highlight a specific voxel range using LevelWindow and custom
LUT function but without any luck. I would like the values between the [a, b]
range to display in red and the values [imgMin, a[ and ]b, imgMax] to be
transparent. The image voxels are scalars.
First, I set my level to (a+b/2.0) and my window to (b-a). I build a custom LUT
that looks like the following
vtkColorTransferFunction* vtkColorFct = vtkColorTransferFunction::New();
vtkColorFct->AddRGBSegment(m_LowerBound, 0., 0., 0.,
lower, 0., 0., 0.);
vtkColorFct->AddRGBSegment(lower, 1., 0., 0.,
upper, 1., 0., 0.);
vtkColorFct->AddRGBSegment(upper, 1., 0., 0.,
m_UpperBound, 1., 0., 0.);
vtkPiecewiseFunction* vtkOpacity = vtkPiecewiseFunction::New();
vtkOpacity->AddPoint(m_LowerBound, 0.);
vtkOpacity->AddPoint(lower-0.001, 0.);
vtkOpacity->AddPoint(lower, 1.);
vtkOpacity->AddPoint(upper, 1.);
vtkOpacity->AddPoint(upper+0.001, 0.);
vtkOpacity->AddPoint(m_UpperBound, 0.);
mitk::LookupTable::Pointer lt = mitk::LookupTable::New();
lt->CreateColorTransferFunction(vtkColorFct);
lt->CreateOpacityTransferFunction(vtkOpacity);
lt->CreateGradientTransferFunction(vtkOpacity);
and set the LookupTable property accordingly. However, it doesn't display as
expected (mostly garbage). I also built another custom LUT using
vtkSmartPointer<vtkLookupTable> vtkLUT =
vtkSmartPointer<vtkLookupTable>::New();
vtkLUT->SetTableRange(lower, upper);
vtkLUT->SetNumberOfTableValues(2);
vtkLUT->SetTableValue( 0, 0.0, 0.0, 0.0, 0.0 );
vtkLUT->SetTableValue( 1, 1.0, 0.0, 0.0, 1.0 );
vtkLUT->Build();
but it also doesn't work because the values higher than upper are clamped to
the maximum display value.
Any hints? Is this the right approach to achieve this?
Regards,
--
Félix C. Morency, M.Sc.
Plateforme d’analyse et de visualisation d’images
Centre Hospitalier Universitaire de Sherbrooke
Centre de recherche clinique Étienne-Le Bel
Local Z5-3031 | 819.346.1110 ext 16634<tel:819.346.1110%20ext%2016634>
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