[vtkusers] Extract slices from a vtkMetaImageReader with vtkExtractVOI

[mathilde.merle]

Thank you for "SetSlice", it is really usefull.

When I pick a pixel on the vtkImageViewer2, I display the good location in the image and in space.

However It still remains 2 problems :

- The image does not change at the beginning if I change the slice_nb.

-  When I move the mouse on the image, I want to change the slice :

case vtkCommand::MouseMoveEvent:
                style->OnMouseMove();
              
                // Change slice
                int slice_nb = Viewer->GetSlice();
                Viewer->SetSlice(slice_nb++);

                cout<<"MOUSE MOVE EVENT :"<Render();
                style->OnMouseMove();
                break;     

And slice_nb does not change even if I enter several times in this code.

(excuse my english...)

Mathilde

> Message du 30/06/11 16:19
> De : "Jothy"
> A : "mathilde.merle"
> Copie à : "vtkusers vtk org"
> Objet : Re: [vtkusers] Extract slices from a vtkMetaImageReader with vtkExtractVOI
>
> If you use vtkImageViewer2, you shouls use setSlice and setorientationTo methods to set the desired orientation adn the slice no after setting the setInput/setinputConnection.
>
> have a look at this link
>
> http://devsample.org/index.php?option=com_content&task=view&id=47&Itemid=27
>
> Jothy
>
> On Thu, Jun 30, 2011 at 4:01 PM, mathilde.merle  wrote:
> 
> 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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> > > 

>
> 
> 

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