[Insight-users] Problem showing Dicom Image : where is the error?

[charfeddine amir]

hi All
I'm developping an application that reads the first serie of
Dicom images from a directory, show each image and save it
in bmp format.
the problem is that image series is well readed, and image
  are well saved in bmp format, but image are not well showed
in the vtkrenderwindow used ( i get a black window with two
white line on it and not the image readed).
this code in the main file :

this function is for reading first series from a given   
directory and showing it's first dicom image(invoked by 
pushing the Read Directory button in the GUI)
void
migAppBase
::ReadImage()
{
  // Can only read an image once
  if(m_InputImage.IsNotNull())  
   return;
  
  char* chooserName = fl_dir_chooser("select a dicom directory", 0, 0);

  // Store the filename
  strcpy( m_InputImageDirectoryname, chooserName );
  reader = ReaderType::New();  
  dicomIO = ImageIOType::New();
  nameGenerator = NamesGeneratorType::New();
  reader->SetImageIO( dicomIO );
  nameGenerator->SetUseSeriesDetails( true );
  nameGenerator->SetDirectory( m_InputImageDirectoryname );  
  seriesUID = nameGenerator->GetSeriesUIDs();
    
  seriesIdentifier = seriesUID.begin()->c_str();
     
  fileNames = nameGenerator->GetFileNames( seriesIdentifier );

  FileNamesItr = fileNames.begin  ();
  FileNamesEnd = fileNames.end();
    
    
  rescaler = RescaleFilterType::New();
  rescaler->SetOutputMinimum(   0 );
  rescaler->SetOutputMaximum( 255 );
  reader->SetFileName( FileNamesItr->c_str() );  

  try
      {
    rescaler->SetInput( reader->GetOutput() );
    reader->Update();
    m_InputImage = reader->GetOutput();
    m_InputImage->SetRequestedRegionToLargestPossibleRegion();  
    
    // Create the input image VTK pipeline
    this->CreateInputImageWindow();

  }
    catch (itk::ExceptionObject &ex)
      {
      }

  FileNamesItr++;
}

this function is for reading the next image in the serie  
(invoked by pushing the Read Next button in the GUI)

 void
migAppBase
::ReadNext()
{


if ( FileNamesItr != FileNamesEnd )
{

reader->SetFileName( FileNamesItr->c_str() );

    try
      {
    rescaler->SetInput( reader->GetOutput() );
    m_InputImage = reader->GetOutput();
    m_InputImage->SetRequestedRegionToLargestPossibleRegion();
    reader->Update();
    // Create the input image VTK pipeline  
    this->CreateInputImageWindow();

      }
    catch (itk::ExceptionObject &ex)
      {
      }
FileNamesItr++;
}
}

this function is for saving the actual image (that should
  be showed in the vtk window) in bmp format (invoked by 
pushing the save Image in the GUI)

 void
migAppBase
::SaveImage()
{

Writer2Type::Pointer writer2 = Writer2Type::New();

std::string OutputFilename1 = FileNamesItr->c_str() + std::string(".bmp");  
writer2->SetFileName( OutputFilename1.c_str() );
writer2->SetInput( rescaler->GetOutput() );

  try
    {
    writer2->Update();
    }
  catch (itk::ExceptionObject & e)
    {
      }

}

this is the fuction for showing the actual image

void
migAppBase
::CreateInputImageWindow()
{
  // If this is the first time we've hit Image Suivante there's other stuff
  // that needs to happen  
  if(m_IsFirstUpdate)
  {
    // Display the output image
    CreateWindowWithRWI(m_InputInteractor, m_InputWindow, "Input Image");

  // these two steps are VERY IMPORTANT, you have to show() the fltk window  
  // containing the vtkFlRenderWindowInteractor, and then the
  // vtkFlRenderWindowInteractor itself
  m_InputWindow->show();
  m_InputInteractor->show();
   
  // now we get to setup our VTK rendering pipeline  
  CreateInputImageVTKPipeline(m_InputInteractor);

    // No longer the first update
    m_IsFirstUpdate = false;
  }
  else
  {
    // Refresh the output window if not the first update
    // NB: doing this on the first update on Windows causes a new  
    // renderwindow to spawn (not sure why)
   m_InputRenderWindow->Render();
  }
  
}

function(s) for fltk and vtk interaction( creation of the
vtkrenderwindow and integrating it to the fltk window)   

void
migAppBase
::CreateWindowWithRWI(vtkFlRenderWindowInteractor *&flrwi, Fl_Window *&flw, char *title)
{
   // set up main FLTK window
   flw = new Fl_Window(300,330,title);
   
   // and instantiate vtkFlRenderWindowInteractor (here it acts like a  
   // FLTK window, i.e. you could also instantiate it as child of a
   // Fl_Group in a window)
   flrwi = new vtkFlRenderWindowInteractor(5,5,290,260,NULL);

   // this will result in a little message under the rendering  
   Fl_Box* box = new Fl_Box(5,261,290,34,
                             "3 = stereo, j = joystick, t = trackball, "
                            "w = wireframe, s = surface, p = pick; "
                            "you can also resize the window");  
   box->labelsize(10);
   box->align(FL_ALIGN_WRAP);
   
   // we're done populating the flw
   flw->end();

   // if the main window gets resized, the vtk window should resize with it
   flw->resizable(flrwi);  
}

void
migAppBase
::CreateInputImageVTKPipeline(vtkFlRenderWindowInteractor *flrwi)
{
  // Abort if the user is being stupid
  if(m_InputImage.IsNull()) 
    return;

  // create a rendering window and renderer  
  m_InputRenderer = vtkRenderer::New();
  m_InputRenderer->SetBackground(0.0, 0.0, 0.0);
  
  m_InputRenderWindow = vtkRenderWindow::New();
  m_InputRenderWindow->AddRenderer(m_InputRenderer);
     
  // NB: here we treat the vtkFlRenderWindowInteractor just like any other
  // old vtkRenderWindowInteractor
  flrwi->SetRenderWindow(m_InputRenderWindow);

  // Hook the VTK pipeline up to the ITK pipeline  
  m_InputImageITKtoVTKexporter = itk::VTKImageExport<InputImageType>::New();
  m_InputImageVTKimporter = vtkImageImport::New();
  m_InputImageITKtoVTKexporter->SetInput( m_InputImage );
  ConnectPipelines(m_InputImageITKtoVTKexporter, m_InputImageVTKimporter);  

  // Need to update prior to creating the cutting planes
  m_InputImageITKtoVTKexporter->Update();
  m_InputImageVTKimporter->Update();

  // Create the image cutting planes
  m_InputImagePlaneX = vtkImagePlaneWidget::New();  
  m_InputImagePlaneX->RestrictPlaneToVolumeOn();
  m_InputImagePlaneX->SetResliceInterpolateToCubic();
  m_InputImagePlaneX->SetInput( (vtkDataSet*) m_InputImageVTKimporter->GetOutput() );
  m_InputImagePlaneX->SetPlaneOrientationToXAxes();  
  m_InputImagePlaneX->SetSliceIndex( 0 );
  
  m_InputImagePlaneY = vtkImagePlaneWidget::New();
  m_InputImagePlaneY->RestrictPlaneToVolumeOn();
  m_InputImagePlaneY->SetResliceInterpolateToCubic();  
  m_InputImagePlaneY->SetInput( (vtkDataSet*) m_InputImageVTKimporter->GetOutput() );
  m_InputImagePlaneY->SetPlaneOrientationToYAxes();
  m_InputImagePlaneY->SetSliceIndex( 0 );
  // Set the position of the image planes to the center of the volume  
  this->ResetInputImagePlaneWidgets();

  // Link the image planes to the interactor
  m_InputImagePlaneX->SetInteractor( flrwi );
  m_InputImagePlaneY->SetInteractor( flrwi );

  // Turn on the image plane so they display  
  m_InputImagePlaneX->On();
  m_InputImagePlaneY->On();

  // just like with any other vtkRenderWindowInteractor(), you HAVE to call
  // Initialize() before the interactor will function.  See the docs in  
  // vtkRenderWindowInteractor.h
  // This must occur AFTER the image planes have been added to the interactor
  flrwi->Initialize();

  // Clean up memory allocation (NB: not actually deleted until program returns)  
  m_InputRenderer->Delete();
  m_InputRenderWindow->Delete();
}

thx for help
any comment is welcome
Amir



		
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