appli/examples/example_ImageAlgorithmDijkstra_03.cxx

   1 #include <cmath>
   2 #include <ctime>
   3 #include <deque>
   4 #include <iostream>
   5 #include <limits>
   6 #include <map>
   7 #include <string>
   8
   9 #include <itkConstNeighborhoodIterator.h>
  10 #include <itkNeighborhoodIterator.h>
  11 #include <itkDanielssonDistanceMapImageFilter.h>
  12 #include <itkImage.h>
  13 #include <itkImageFileReader.h>
  14 #include <itkImageFileWriter.h>
  15 #include <itkImageToVTKImageFilter.h>
  16
  17 #include <vtkPoints.h>
  18 #include <vtkCellArray.h>
  19 #include <vtkFloatArray.h>
  20 #include <vtkPolyData.h>
  21 #include <vtkSmartPointer.h>
  22
  23 #include <fpa/Image/DijkstraWithSphereBacktracking.h>
  24 #include <fpa/VTK/ImageMPR.h>
  25 #include <fpa/VTK/Image3DObserver.h>
  26
  27 // -------------------------------------------------------------------------
  28 const unsigned int Dim = 3;
  29 typedef double                               TPixel;
  30 typedef double                               TScalar;
  31 typedef itk::Image< TPixel, Dim >            TImage;
  32 typedef itk::ImageToVTKImageFilter< TImage > TVTKImage;
  33
  34 typedef itk::ImageFileReader< TImage >          TImageReader;
  35 typedef itk::ImageFileWriter< TImage >          TImageWriter;
  36 typedef fpa::Image::DijkstraWithSphereBacktracking< TImage, TScalar > TDijkstra;
  37
  38 typedef fpa::VTK::ImageMPR TMPR;
  39 typedef fpa::VTK::Image3DObserver< TDijkstra, vtkRenderWindow > TDijkstraObs;
  40
  41 // -------------------------------------------------------------------------
  42 int main( int argc, char* argv[] )
  43 {
  44   if( argc < 6 )
  45   {
  46     std::cerr
  47       << "Usage: " << argv[ 0 ]
  48       << " input_image x y z output_image"
  49       << " visual_debug"
  50       << std::endl;
  51     return( 1 );
  52
  53   } // fi
  54   std::string input_image_fn = argv[ 1 ];
  55   TImage::IndexType seed_idx;
  56   seed_idx[ 0 ] = std::atoi( argv[ 2 ] );
  57   seed_idx[ 1 ] = std::atoi( argv[ 3 ] );
  58   seed_idx[ 2 ] = std::atoi( argv[ 4 ] );
  59   std::string output_image_fn = argv[ 5 ];
  60   bool visual_debug = false;
  61   if( argc > 6 )
  62     visual_debug = ( std::atoi( argv[ 6 ] ) == 1 );
  63
  64   // Read image
  65   TImageReader::Pointer input_image_reader = TImageReader::New( );
  66   input_image_reader->SetFileName( input_image_fn );
  67   try
  68   {
  69     input_image_reader->Update( );
  70   }
  71   catch( itk::ExceptionObject& err )
  72   {
  73     std::cerr << "Error caught: " << err << std::endl;
  74     return( 1 );
  75
  76   } // yrt
  77   TImage::ConstPointer input_image = input_image_reader->GetOutput( );
  78
  79   // Show image
  80   TVTKImage::Pointer vtk_image = TVTKImage::New( );
  81   vtk_image->SetInput( input_image );
  82   vtk_image->Update( );
  83
  84   TMPR view;
  85   view.SetBackground( 0.3, 0.2, 0.8 );
  86   view.SetSize( 800, 800 );
  87   view.SetImage( vtk_image->GetOutput( ) );
  88
  89   // Allow some interaction
  90   view.Start( );
  91
  92   // Extract paths
  93   TDijkstra::Pointer paths = TDijkstra::New( );
  94   paths->AddSeed( seed_idx, TScalar( 0 ) );
  95   paths->SetInput( input_image );
  96   paths->SetNeighborhoodOrder( 1 );
  97
  98   if( visual_debug )
  99   {
 100     // Configure observer
 101     TDijkstraObs::Pointer obs = TDijkstraObs::New( );
 102     obs->SetRenderWindow( view.GetWindow( ) );
 103     paths->AddObserver( itk::AnyEvent( ), obs );
 104     paths->ThrowEventsOn( );
 105   }
 106   else
 107     paths->ThrowEventsOff( );
 108   std::clock_t start = std::clock( );
 109   paths->Update( );
 110   std::clock_t end = std::clock( );
 111   double seconds = double( end - start ) / double( CLOCKS_PER_SEC );
 112   std::cout << "Paths extraction time = " << seconds << std::endl;
 113
 114   // Create polydata
 115   vtkSmartPointer< vtkPoints > points =
 116     vtkSmartPointer< vtkPoints >::New( );
 117   vtkSmartPointer< vtkCellArray > cells =
 118     vtkSmartPointer< vtkCellArray >::New( );
 119   vtkSmartPointer< vtkFloatArray > scalars =
 120     vtkSmartPointer< vtkFloatArray >::New( );
 121
 122   const TDijkstra::TVertices& endpoints = paths->GetEndPoints( );
 123   const TDijkstra::TTree& tree = paths->GetFinalTree( );
 124   TDijkstra::TVertices::const_iterator epIt = endpoints.begin( );
 125   for( unsigned int epId = 0; epIt != endpoints.end( ); ++epIt, ++epId )
 126   {
 127     double pd = double( epId ) / double( endpoints.size( ) - 1 );
 128
 129     TDijkstra::TVertex idx = *epIt;
 130     do
 131     {
 132       TImage::PointType pnt;
 133       input_image->TransformIndexToPhysicalPoint( idx, pnt );
 134
 135       points->InsertNextPoint( pnt[ 0 ], pnt[ 1 ], pnt[ 2 ] );
 136       scalars->InsertNextTuple1( pd );
 137       if( idx != *epIt )
 138       {
 139         cells->InsertNextCell( 2 );
 140         cells->InsertCellPoint( points->GetNumberOfPoints( ) - 2 );
 141         cells->InsertCellPoint( points->GetNumberOfPoints( ) - 1 );
 142
 143       } // fi
 144       idx = tree.find( idx )->second;
 145
 146     } while( idx != tree.find( idx )->second );
 147
 148   } // rof
 149
 150   vtkSmartPointer< vtkPolyData > vtk_tree =
 151     vtkSmartPointer< vtkPolyData >::New( );
 152   vtk_tree->SetPoints( points );
 153   vtk_tree->SetLines( cells );
 154   vtk_tree->GetPointData( )->SetScalars( scalars );
 155
 156   view.AddPolyData( vtk_tree );
 157   view.Render( );
 158   view.Start( );
 159
 160   /* TODO
 161      TImageWriter::Pointer dijkstra_writer =
 162      TImageWriter::New( );
 163      dijkstra_writer->SetInput( paths->GetOutput( ) );
 164      dijkstra_writer->SetFileName( "dijkstra.mhd" );
 165      dijkstra_writer->Update( );
 166   */
 167
 168   return( 0 );
 169 }
 170
 171 // eof - $RCSfile$