appli/examples/example_Image_RegionGrow_ConnectedPixels.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 <fpa/Image/RegionGrow.h>
  10 #include <fpa/Image/Functors/RegionGrowThresholdFunction.h>
  11 #include <fpa/VTK/Image2DObserver.h>
  12
  13 #include "fpa_Utility.h"
  14
  15 // -------------------------------------------------------------------------
  16 const unsigned int Dim = 2;
  17 typedef unsigned char TPixel;
  18 typedef itk::Image< TPixel, Dim > TImage;
  19
  20 // -------------------------------------------------------------------------
  21 int main( int argc, char* argv[] )
  22 {
  23   if( argc < 3 )
  24   {
  25     std::cerr
  26       << "Usage: " << argv[ 0 ]
  27       << " input_image neighborhood_order"
  28       << std::endl;
  29     return( 1 );
  30
  31   } // fi
  32   std::string input_image_fn = argv[ 1 ];
  33   unsigned int neighborhood_order = std::atoi( argv[ 2 ] );
  34
  35   // Read image
  36   TImage::Pointer input_image;
  37   std::string err = fpa_Utility::ReadImage( input_image, input_image_fn );
  38   if( err != "" )
  39   {
  40     std::cerr << err << std::endl;
  41     return( 1 );
  42
  43   } // fi
  44
  45   // Show image and wait for, at least, one seed
  46   itk::ImageToVTKImageFilter< TImage >::Pointer vtk_input_image =
  47     itk::ImageToVTKImageFilter< TImage >::New( );
  48   vtk_input_image->SetInput( input_image );
  49   vtk_input_image->Update( );
  50
  51   fpa_Utility::Viewer2DWithSeeds viewer;
  52   viewer.SetImage( vtk_input_image->GetOutput( ) );
  53   while( viewer.GetNumberOfSeeds( ) == 0 )
  54     viewer.Start( );
  55
  56   // Region growing types
  57   typedef fpa::Image::RegionGrow< TImage > TFilter;
  58   typedef fpa::Image::Functors::
  59     RegionGrowThresholdFunction< TImage > TFunction;
  60
  61   // Prepare region grow function
  62   TFunction::Pointer function = TFunction::New( );
  63
  64   // Prepare region grow filter
  65   TFilter::Pointer filter = TFilter::New( );
  66   filter->SetInput( input_image );
  67   filter->SetGrowingFunction( function );
  68   filter->SetNeighborhoodOrder( neighborhood_order );
  69   filter->SetOutsideValue( TPixel( 0 ) );
  70   filter->SetInsideValue( std::numeric_limits< TPixel >::max( ) );
  71   filter->StopAtOneFrontOff( );
  72
  73   // Associate seed
  74   TImage::PointType pnt;
  75   TImage::IndexType idx;
  76   viewer.GetSeed( pnt, 0 );
  77   if( input_image->TransformPhysicalPointToIndex( pnt, idx ) )
  78     filter->AddSeed( idx, 0 );
  79   function->SetLowerThreshold( input_image->GetPixel( idx ) );
  80   function->SetUpperThreshold( input_image->GetPixel( idx ) );
  81
  82   // Prepare graphical debugger
  83   typedef fpa::VTK::Image2DObserver< TFilter, vtkRenderWindow > TDebugger;
  84   TDebugger::Pointer debugger = TDebugger::New( );
  85   debugger->SetRenderWindow( viewer.Window );
  86   debugger->SetRenderPercentage( 0.01 );
  87   filter->AddObserver( itk::AnyEvent( ), debugger );
  88   filter->ThrowEventsOn( );
  89
  90   // Go!
  91   filter->Update( );
  92
  93   // Some more interaction and finish
  94   viewer.Start( );
  95   return( 0 );
  96 }
  97
  98 // eof - $RCSfile$