appli/examples/example_Image_RegionGrow_ConnectedRGBPixels.cxx

   1 #include <cstdlib>
   2 #include <iostream>
   3 #include <limits>
   4 #include <string>
   5
   6 #include <itkImage.h>
   7 #include <itkRGBPixel.h>
   8 #include <itkImageToVTKImageFilter.h>
   9
  10 #include <fpa/Image/RegionGrow.h>
  11 #include <fpa/Image/Functors/RegionGrowThresholdFunction.h>
  12 #include <fpa/VTK/Image2DObserver.h>
  13
  14 #include "fpa_Utility.h"
  15
  16 // -------------------------------------------------------------------------
  17 const unsigned int Dim = 2;
  18 typedef unsigned char TPixel;
  19 typedef itk::Image< itk::RGBPixel< TPixel >, Dim > TColorImage;
  20 typedef itk::Image< TPixel, Dim > TImage;
  21
  22 // -------------------------------------------------------------------------
  23 int main( int argc, char* argv[] )
  24 {
  25   if( argc < 3 )
  26   {
  27     std::cerr
  28       << "Usage: " << argv[ 0 ]
  29       << " input_image neighborhood_order"
  30       << std::endl;
  31     return( 1 );
  32
  33   } // fi
  34   std::string input_image_fn = argv[ 1 ];
  35   unsigned int neighborhood_order = std::atoi( argv[ 2 ] );
  36
  37   // Read image
  38   TColorImage::Pointer input_image;
  39   std::string err = fpa_Utility::ReadImage( input_image, input_image_fn );
  40   if( err != "" )
  41   {
  42     std::cerr << err << std::endl;
  43     return( 1 );
  44
  45   } // fi
  46
  47   // Show image and wait for, at least, one seed
  48   itk::ImageToVTKImageFilter< TColorImage >::Pointer vtk_input_image =
  49     itk::ImageToVTKImageFilter< TColorImage >::New( );
  50   vtk_input_image->SetInput( input_image );
  51   vtk_input_image->Update( );
  52
  53   fpa_Utility::Viewer2DWithSeeds viewer;
  54   viewer.SetImage( vtk_input_image->GetOutput( ) );
  55   while( viewer.GetNumberOfSeeds( ) == 0 )
  56     viewer.Start( );
  57
  58   // Region growing types
  59   typedef fpa::Image::RegionGrow< TColorImage, TImage > TFilter;
  60   typedef fpa::Image::Functors::
  61     RegionGrowThresholdFunction< TColorImage > TFunction;
  62
  63   // Prepare region grow function
  64   TFunction::Pointer function = TFunction::New( );
  65
  66   // Prepare region grow filter
  67   TFilter::Pointer filter = TFilter::New( );
  68   filter->SetInput( input_image );
  69   filter->SetGrowingFunction( function );
  70   filter->SetNeighborhoodOrder( neighborhood_order );
  71   filter->SetOutsideValue( TPixel( 0 ) );
  72   filter->SetInsideValue( std::numeric_limits< TPixel >::max( ) );
  73   filter->StopAtOneFrontOff( );
  74
  75   // Associate seed
  76   TImage::PointType pnt;
  77   TImage::IndexType idx;
  78   viewer.GetSeed( pnt, 0 );
  79   if( input_image->TransformPhysicalPointToIndex( pnt, idx ) )
  80     filter->AddSeed( idx, 0 );
  81   function->SetLowerThreshold( input_image->GetPixel( idx ) );
  82   function->SetUpperThreshold( input_image->GetPixel( idx ) );
  83
  84   // Prepare graphical debugger
  85   typedef fpa::VTK::Image2DObserver< TFilter, vtkRenderWindow > TDebugger;
  86   TDebugger::Pointer debugger = TDebugger::New( );
  87   debugger->SetRenderWindow( viewer.Window );
  88   debugger->SetRenderPercentage( 0.01 );
  89   filter->AddObserver( itk::AnyEvent( ), debugger );
  90   filter->ThrowEventsOn( );
  91
  92   // Go!
  93   filter->Update( );
  94
  95   // Some more interaction and finish
  96   viewer.Start( );
  97   return( 0 );
  98 }
  99
 100 // eof - $RCSfile$