How to make a DicomImage fill a window

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#1

Here is my code ,

vtkSmartPointer imageViewer =vtkSmartPointer::New();
imageViewer->SetInputConnection(imageflip->GetOutputPort());
imageViewer->Render();
imageViewer->GetRenderWindow()->SetWindowName(“ROI”);
imageViewer->GetRenderer()->GetActiveCamera()->SetParallelProjection(1);
double size1 = size[1];//size is the size of image
double size0 = size[0];
imageViewer->GetRenderer()->GetRenderWindow()-> SetSize(size0 / 4, size1 /4);
imageViewer->Render();

When i run the programm ,the image can dispaly on the vtkwidgets(vtkimageviewer2) but always with the annoying blue borders.As the screenshot shows…

borders
borders310×721 21.7 KB

I try to set the

imageViewer->GetRenderer()->GetActiveCamera()->Zoom(offset);

It helps to reduce the borders but i dont know how big is offset is correct, I used 4 as offset because i have resized the window 1/4 than original size but that not big enough,for this image i need to set offset as 5.1

And i noticed if i load the different dicomseries then the offset will also be different ,it is so wired.
There is some function in vtk let the image automaic fill the window?

#2

Have you checked the following resources?

http://vtk.1045678.n5.nabble.com/fit-to-screen-in-vtkImageViewer2-QVTKWidget-td5744151.html
https://lorensen.github.io/VTKExamples/site/Cxx/Images/FillWindow/

1 Like
#3

Thanks for your reply! Yes i have both of them checked. My input data is a Dicomseries not a single dicom which show in Example , So I didn’t read it carefully. But you said it might work, so I went through it again. This part from link https://lorensen.github.io/VTKExamples/site/Cxx/Images/FillWindow/ help me out of the Problem! even though i dont know why it works butI’ll figure it out later. Thank you so much !!!

      int extent[6];
      castFilter->GetOutput()->GetExtent(extent);
      double origin[3];
      castFilter->GetOutput()->GetOrigin(origin);

      double spacing[3];
      castFilter->GetOutput()->GetSpacing(spacing);

      // Setup renderer
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      renderer->AddActor(imageSlice);
      renderer->ResetCamera();

      // Setup render window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

      vtkCamera* camera = renderer->GetActiveCamera();
      camera->ParallelProjectionOn();
      renderer->SetBackground(1,0,0);

      float xc = origin[0] + 0.5*(extent[0] + extent[1])*spacing[0];
      float yc = origin[1] + 0.5*(extent[2] + extent[3])*spacing[1];
    //  float xd = (extent[1] - extent[0] + 1)*spacing[0]; // not used
      float yd = (extent[3] - extent[2] + 1)*spacing[1];

      float d = camera->GetDistance();
      camera->SetParallelScale(0.5f*static_cast<float>(yd));
      camera->SetFocalPoint(xc,yc,0.0);
      camera->SetPosition(xc,yc,+d);