[vtkusers] Extract slices from a vtkMetaImageReader with vtkExtractVOI

[Jothy]

Which image viewer are you using here?

Jothy

On Thu, Jun 30, 2011 at 3:41 PM, mathilde.merle
<mathilde.merle at laposte.net>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<vtkExtractVOI> extractVOI =
> vtkSmartPointer<vtkExtractVOI>::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<vtkRenderWindowInteractor> renderWindowInteractor =
> vtkSmartPointer<vtkRenderWindowInteractor>::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<vtkCornerAnnotation> cornerAnnotation =
> vtkSmartPointer<vtkCornerAnnotation>::New();
>     cornerAnnotation->SetLinearFontScaleFactor( 2 );
>     cornerAnnotation->SetNonlinearFontScaleFactor( 1 );
>     cornerAnnotation->SetMaximumFontSize( 20 );
>     cornerAnnotation->SetText( 0, "Off Image" );
>     cornerAnnotation->SetText( 3, "<window>\n<level>" );
>     cornerAnnotation->GetTextProperty()->SetColor( 1,0,0);
>
>     imageViewer->GetRenderer()->AddViewProp( cornerAnnotation );
>
>     // Callback listens to MouseMoveEvents invoked by the interactor's
> style
>     vtkSmartPointer<vtkImageInteractionCallback> callback =
> vtkSmartPointer<vtkImageInteractionCallback>::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
>
> <https://compte.laposte.net/inscription/index.do?jeux=2011FOOTER_generique>
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