appli/examples/example_Image_Dijkstra_CostFromInput.cxx

   1 #include <cstdlib>
   2 #include <iostream>
   3 #include <limits>
   4 #include <string>
   5
   6 #include <itkImage.h>
   7 #include <itkImageToVTKImageFilter.h>
   8
   9 #include <itkImageFileReader.h>
  10 #include <itkImageFileWriter.h>
  11
  12 #include <vtkCamera.h>
  13 #include <vtkImageActor.h>
  14 #include <vtkInteractorStyleImage.h>
  15 #include <vtkPointHandleRepresentation3D.h>
  16 #include <vtkProperty.h>
  17 #include <vtkRenderer.h>
  18 #include <vtkRenderWindow.h>
  19 #include <vtkRenderWindowInteractor.h>
  20 #include <vtkSeedRepresentation.h>
  21 #include <vtkSeedWidget.h>
  22 #include <vtkSmartPointer.h>
  23
  24 #include <fpa/Image/Dijkstra.h>
  25 #include <fpa/VTK/Image2DObserver.h>
  26
  27 // -------------------------------------------------------------------------
  28 const unsigned int Dim = 2;
  29 typedef unsigned char TInputPixel;
  30 typedef float         TOutputPixel;
  31
  32 typedef itk::Image< TInputPixel, Dim >            TInputImage;
  33 typedef itk::Image< TOutputPixel, Dim >           TOutputImage;
  34 typedef itk::ImageToVTKImageFilter< TInputImage > TVTKInputImage;
  35
  36 // -------------------------------------------------------------------------
  37 int main( int argc, char* argv[] )
  38 {
  39   if( argc < 5 )
  40   {
  41     std::cerr
  42       << "Usage: " << argv[ 0 ]
  43       << " input_image output_image neighborhood_order stop_at_one_front"
  44       << std::endl;
  45     return( 1 );
  46
  47   } // fi
  48   std::string input_image_fn = argv[ 1 ];
  49   std::string output_image_fn = argv[ 2 ];
  50   unsigned int neighborhood_order = std::atoi( argv[ 3 ] );
  51   bool stop_at_one_front = ( std::atoi( argv[ 4 ] ) != 0 );
  52
  53   // Read image
  54   itk::ImageFileReader< TInputImage >::Pointer input_image_reader =
  55     itk::ImageFileReader< TInputImage >::New( );
  56   input_image_reader->SetFileName( input_image_fn );
  57   try
  58   {
  59     input_image_reader->Update( );
  60   }
  61   catch( itk::ExceptionObject& err )
  62   {
  63     std::cerr
  64       << "Error while reading image from " << input_image_fn << ": "
  65       << err << std::endl;
  66     return( 1 );
  67
  68   } // yrt
  69   TInputImage::ConstPointer input_image = input_image_reader->GetOutput( );
  70   TVTKInputImage::Pointer vtk_input_image = TVTKInputImage::New( );
  71   vtk_input_image->SetInput( input_image );
  72   vtk_input_image->Update( );
  73
  74   // VTK visualization
  75   vtkSmartPointer< vtkImageActor > actor =
  76     vtkSmartPointer< vtkImageActor >::New( );
  77   actor->SetInputData( vtk_input_image->GetOutput( ) );
  78
  79   vtkSmartPointer< vtkRenderer > renderer =
  80     vtkSmartPointer< vtkRenderer >::New( );
  81   renderer->SetBackground( 0.1, 0.2, 0.7 );
  82   renderer->AddActor( actor );
  83   vtkSmartPointer< vtkRenderWindow > window =
  84     vtkSmartPointer< vtkRenderWindow >::New( );
  85   window->SetSize( 800, 800 );
  86   window->AddRenderer( renderer );
  87
  88   // Correct camera due to the loaded image
  89   vtkCamera* camera = renderer->GetActiveCamera( );
  90   camera->SetViewUp( 0, -1, 0 );
  91   camera->SetPosition( 0, 0, -1 );
  92   camera->SetFocalPoint( 0, 0, 0 );
  93
  94   // VTK interaction
  95   vtkSmartPointer< vtkInteractorStyleImage > imageStyle =
  96     vtkSmartPointer< vtkInteractorStyleImage >::New( );
  97   vtkSmartPointer< vtkRenderWindowInteractor > interactor =
  98     vtkSmartPointer< vtkRenderWindowInteractor >::New( );
  99   interactor->SetInteractorStyle( imageStyle );
 100   window->SetInteractor( interactor );
 101
 102   // Create the widget and its representation
 103   vtkSmartPointer< vtkPointHandleRepresentation3D > handle =
 104     vtkSmartPointer< vtkPointHandleRepresentation3D >::New( );
 105   handle->GetProperty( )->SetColor( 1, 0, 0 );
 106   vtkSmartPointer< vtkSeedRepresentation > rep =
 107     vtkSmartPointer< vtkSeedRepresentation >::New( );
 108   rep->SetHandleRepresentation( handle );
 109
 110   vtkSmartPointer< vtkSeedWidget > widget =
 111     vtkSmartPointer< vtkSeedWidget >::New( );
 112   widget->SetInteractor( interactor );
 113   widget->SetRepresentation( rep );
 114
 115   // Let some interaction
 116   interactor->Initialize( );
 117   renderer->ResetCamera( );
 118   window->Render( );
 119   widget->On( );
 120   interactor->Start( );
 121
 122   // Prepare region grow filter
 123   typedef fpa::Image::Dijkstra< TInputImage, TOutputImage > TFilter;
 124   TFilter::Pointer filter = TFilter::New( );
 125   filter->SetInput( input_image );
 126   filter->SetNeighborhoodOrder( neighborhood_order );
 127   filter->SetStopAtOneFront( stop_at_one_front );
 128
 129   // Get user-given seeds
 130   for( unsigned int s = 0; s < rep->GetNumberOfSeeds( ); s++ )
 131   {
 132     double pos[ 3 ];
 133     rep->GetSeedWorldPosition( s, pos );
 134
 135     TInputImage::PointType pnt;
 136     pnt[ 0 ] = TInputImage::PointType::ValueType( pos[ 0 ] );
 137     pnt[ 1 ] = TInputImage::PointType::ValueType( pos[ 1 ] );
 138
 139     TInputImage::IndexType idx;
 140     if( input_image->TransformPhysicalPointToIndex( pnt, idx ) )
 141       filter->AddSeed( idx, 0 );
 142
 143   } // rof
 144
 145   // Prepare graphical debugger
 146   typedef fpa::VTK::Image2DObserver< TFilter, vtkRenderWindow > TDebugger;
 147   TDebugger::Pointer debugger = TDebugger::New( );
 148   debugger->SetRenderWindow( window );
 149   debugger->SetRenderPercentage( 0.001 );
 150   filter->AddObserver( itk::AnyEvent( ), debugger );
 151   filter->ThrowEventsOn( );
 152
 153   // Go!
 154   filter->Update( );
 155
 156   // Save final total cost map
 157   itk::ImageFileWriter< TOutputImage >::Pointer output_image_writer =
 158     itk::ImageFileWriter< TOutputImage >::New( );
 159   output_image_writer->SetFileName( output_image_fn );
 160   output_image_writer->SetInput( filter->GetOutput( ) );
 161   try
 162   {
 163     output_image_writer->Update( );
 164   }
 165   catch( itk::ExceptionObject& err )
 166   {
 167     std::cerr
 168       << "Error while writing image to " << output_image_fn << ": "
 169       << err << std::endl;
 170     return( 1 );
 171
 172   } // yrt
 173
 174   return( 0 );
 175 }
 176
 177 // eof - $RCSfile$