[vtkusers] Extract slices from a vtkMetaImageReader with vtkExtractVOI

[mathilde.merle]

I use vtkImageViewer2 :

    // VIEWER TOOL : Pick a Pixel
    // Picker to pick pixels
    vtkSmartPointer propPicker = vtkSmartPointer::New();
    propPicker->PickFromListOn();
   
    // Give the picker a prop to pick
    vtkSmartPointer imageViewer = vtkSmartPointer::New();
    vtkImageActor* imageActor = imageViewer->GetImageActor();
    propPicker->AddPickList(imageActor);
   
    // disable interpolation, so we can see each pixel
    imageActor->InterpolateOff();

> Message du 30/06/11 15:54
> De : "Jothy"
> A : "mathilde.merle"
> Copie à : "vtkusers vtk org"
> Objet : Re: [vtkusers] Extract slices from a vtkMetaImageReader with vtkExtractVOI
>
> Which image viewer are you using here?
>
> Jothy
>
> On Thu, Jun 30, 2011 at 3:41 PM, mathilde.merle  wrote:
> 
> 

> Hello,
>
> I'm trying to extract slices from a vtkImagedata sequence and then display it.
>
> I tryed with vtkImageReslice and then vtkextractVOI, but it don't work. The image displayed is always the same even if I change 'slice_nb'.
>
> How can I do ?
>
> My code :
> 
> int* dims = reader->GetOutput()->GetDimensions();
>
> // extract slice
>
> int slice_nb = 0;
>
> vtkSmartPointer extractVOI = vtkSmartPointer::New();
>     extractVOI->SetInputConnection(reader->GetOutputPort());
>     extractVOI->SetVOI(0,dims[0],0,dims[1], slice_nb, slice_nb); //extract first image
>     extractVOI->Update();
>    
>     vtkImageData* extracted = extractVOI->GetOutput();
>
>     int* dims2 = extracted->GetDimensions();
>     cout << "DimensionsExtracted = ";
>     for (int i=0; i<(int)(sizeof(dims2)/sizeof(int)+1); i++) {
>         cout << dims2[i]<<", ";
>     }
>     cout << endl; // Get a good image dimension
>    
> // Visualize
>     vtkSmartPointer renderWindowInteractor = vtkSmartPointer::New();
>     imageViewer->SetInputConnection(extractVOI->GetOutputPort() );
>     imageViewer->SetupInteractor( renderWindowInteractor );
>     imageViewer->SetSize( 600, 600 );
>    
>     vtkRenderer* renderer = imageViewer->GetRenderer();
>     renderer->ResetCamera();
>     renderer->GradientBackgroundOn();
>     renderer->SetBackground(0,0,0);
>     renderer->SetBackground2(1,1,1);
>    
>     // Annotate the image with window/level and mouse over pixel information
>     vtkSmartPointer cornerAnnotation = vtkSmartPointer::New();
>     cornerAnnotation->SetLinearFontScaleFactor( 2 );
>     cornerAnnotation->SetNonlinearFontScaleFactor( 1 );
>     cornerAnnotation->SetMaximumFontSize( 20 );
>     cornerAnnotation->SetText( 0, "Off Image" );
>     cornerAnnotation->SetText( 3, "\n" );
>     cornerAnnotation->GetTextProperty()->SetColor( 1,0,0);
>    
>     imageViewer->GetRenderer()->AddViewProp( cornerAnnotation );
>    
>     // Callback listens to MouseMoveEvents invoked by the interactor's style
>     vtkSmartPointer callback = vtkSmartPointer::New();
>     callback->SetViewer( imageViewer );
>     callback->SetAnnotation( cornerAnnotation );
>     callback->SetPicker( propPicker );
>     callback->SetOrigin( orgn[0], orgn[1], orgn[2]); // add the origin of the sequence into the class
>
>  // Events recognized
>     vtkInteractorStyleImage* imageStyle = imageViewer->GetInteractorStyle();
>     imageStyle->AddObserver( vtkCommand::MouseMoveEvent, callback );
>     imageStyle->AddObserver( vtkCommand::LeftButtonReleaseEvent, callback );
>
>     renderWindowInteractor->Initialize();
>     renderWindowInteractor->Start();   
>
>
> Thanks
> 
> Mathilde
>
> 
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