[vtkusers] Error messages and no image with vtkImageViewer2
Jan
vtk at schreiber2.de
Thu Jun 19 18:20:34 EDT 2008
Hi John,
thanks a lot for your quick reply.
I have now changed it to
typedef itk::Image< unsigned char, 2 > ImageType;
typedef itk::ImageFileReader< ImageType > ReaderType;
Unfortunately, nothing has changed. The second error message
("vtkOpenGLImageActor (0x1173a00): This filter requires unsigned char
scalars as input") already appears at startup before I initiate loading
the image...
Do you have any other ideas that could solve the issue?
Thanks,
Jan
John Eke wrote:
>
>
> Hi Jan,
>
> Have you tried the ITK+VTK connection reading just one image file for
> now? see if you can make that work before you try reading several
> slices. If you read in the image as <unsigned char, 2> the you shouldn't
> get the second error message anymore.
>
> - John
>
>
> -----Original Message-----
> From: vtkusers-bounces at vtk.org on behalf of Jan
> Sent: Wed 6/18/2008 6:22 PM
> To: vtkusers at vtk.org
> Subject: [vtkusers] Error messages and no image with vtkImageViewer2
>
> Hi,
>
> I am writing a little QT application using ITK and VTK, trying to use
> vtkIMageViewer2.
>
> During startup, I get the following error messages:
>
> ERROR: In VTK-504/Filtering/vtkDemandDrivenPipeline.cxx, line 710
> vtkStreamingDemandDrivenPipeline (0x11b8570): Input port 0 of algorithm
> vtkImageMapToWindowLevelColors(0x118dc50) has 0 connections but is not
> optional.
>
> ERROR: In VTK-504/Rendering/vtkImageActor.cxx, line 182
> vtkOpenGLImageActor (0x11bfaf0): This filter requires unsigned char
> scalars as input
>
> And the view keeps blank
>
>
> =============================================================
> Code:
> =============================================================
> ViewingWidget.h:
> ...
> QVTKWidget _view;
> ...
>
> ViewingWidget.cpp:
> ...
> ViewingWidget::ViewingWidget( const char* name) :
> QWidget()
> {
> _imageViewer = vtkImageViewer2::New();
> _view.setParent( this );
> _view.SetRenderWindow( _imageViewer->GetRenderWindow() );
> _imageViewer->SetupInteractor(
> _view.GetRenderWindow()->GetInteractor() );
> _imageViewer->SetColorLevel( 100 );
> _imageViewer->SetColorWindow( 256 );
> }
> ...
>
> loading the image comes later when pressing a button.
>
> typedef itk::Image< unsigned char, 3 > ImageType;
> typedef itk::ImageSeriesReader< ImageType > ReaderType;
> typedef itk::ImageToVTKImageFilter< ImageType > FilterType;
>
> ImageType::Pointer image;
> ReaderType::Pointer reader = ReaderType::New();
> FilterType::Pointer itk2vtk;
> ...
> reader->SetFileNames( names );
> reader->Update();
> image = reader->GetOutput();
>
> itk2vtk->SetInput( image );
> _imageViewer->SetInput( itk2vtk->GetOutput() );
> =============================================================
>
> when I use
>
> vtkPNGReader* reader = vtkPNGReader::New();
> reader->SetFileName( "image.png" );
> _imageViewer->SetInputConnection( reader->GetOutputPort() );
>
> it shows me a grayscale pattern that does not really look like the input
> image.
>
> =============================================================
>
> It would be great if you could give me a hint how to properly use
> vtkImageViewer2.
>
> Thanks,
> Jan
>
>
> VTK: 5.0.4
> ITK: 3.4.0
> QT: 4.3
> gcc: 4.2.1 (SUSE Linux)
> OpenSuSE 10.3 64bit
>
>
>
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