lib/cpPlugins/Extensions/Algorithms/LightCompensationFilter.hxx

   1 // -------------------------------------------------------------------------
   2 // @author Leonardo Florez-Valencia (florez-l@javeriana.edu.co)
   3 // -------------------------------------------------------------------------
   4
   5 #ifndef __CPPLUGINS__EXTENSIONS__ALGORITHMS__LIGHTCOMPENSATIONFILTER__HXX__
   6 #define __CPPLUGINS__EXTENSIONS__ALGORITHMS__LIGHTCOMPENSATIONFILTER__HXX__
   7
   8 #include <itkImageRegionIterator.h>
   9 #include <itkImageRegionConstIterator.h>
  10 #include <itkNumericTraits.h>
  11
  12 // -------------------------------------------------------------------------
  13 template< class I >
  14 cpPlugins::Extensions::Algorithms::LightCompensationFilter< I >::
  15 LightCompensationFilter( )
  16   : Superclass( )
  17 {
  18   this->SetNumberOfRequiredInputs( 1 );
  19   this->InPlaceOff( );
  20 }
  21
  22 // -------------------------------------------------------------------------
  23 template< class I >
  24 cpPlugins::Extensions::Algorithms::LightCompensationFilter< I >::
  25 ~LightCompensationFilter( )
  26 {
  27 }
  28
  29 // -------------------------------------------------------------------------
  30 template< class I >
  31 void cpPlugins::Extensions::Algorithms::LightCompensationFilter< I >::
  32 BeforeThreadedGenerateData( )
  33 {
  34   I* input = const_cast< I* >( this->GetInput( ) );
  35
  36   typename TMeanCalculator::Pointer mc = TMeanCalculator::New( );
  37   mc->Execute( input, input->GetRequestedRegion( ) );
  38   this->m_Mean = mc->GetMean( );
  39
  40   double gm = this->m_Mean[ 0 ] + this->m_Mean[ 1 ] + this->m_Mean[ 2 ];
  41   gm /= double( 3 );
  42   this->m_Coefficient = this->m_Mean;
  43   this->m_Coefficient.Fill( gm );
  44   this->m_Coefficient[ 0 ] /= this->m_Mean[ 0 ];
  45   this->m_Coefficient[ 1 ] /= this->m_Mean[ 1 ];
  46   this->m_Coefficient[ 2 ] /= this->m_Mean[ 2 ];
  47 }
  48
  49 // -------------------------------------------------------------------------
  50 template< class I >
  51 void cpPlugins::Extensions::Algorithms::LightCompensationFilter< I >::
  52 ThreadedGenerateData( const TRegion& region, itk::ThreadIdType id )
  53 {
  54   typedef itk::NumericTraits< typename I::PixelType > _TPixelTraits;
  55   typedef typename _TPixelTraits::ValueType           _TPixelChannel;
  56   typedef itk::NumericTraits< _TPixelChannel >        _TChannelTraits;
  57   static const double max_value = double( _TChannelTraits::max( ) );
  58
  59   itk::ImageRegionConstIterator< I > iIt( this->GetInput( ), region );
  60   itk::ImageRegionIterator< I > oIt( this->GetOutput( ), region );
  61
  62   iIt.GoToBegin( );
  63   oIt.GoToBegin( );
  64   for( ; !iIt.IsAtEnd( ); ++iIt, ++oIt )
  65   {
  66     double r = double( iIt.Get( )[ 0 ] ) * this->m_Coefficient[ 0 ];
  67     double g = double( iIt.Get( )[ 1 ] ) * this->m_Coefficient[ 1 ];
  68     double b = double( iIt.Get( )[ 2 ] ) * this->m_Coefficient[ 2 ];
  69     if( r > max_value ) r = max_value;
  70     if( g > max_value ) g = max_value;
  71     if( b > max_value ) b = max_value;
  72     oIt.Get( ).Set(
  73       _TPixelChannel( r ), _TPixelChannel( g ), _TPixelChannel( b )
  74       );
  75
  76   } // rof
  77 }
  78
  79 // -------------------------------------------------------------------------
  80 template< class I >
  81 void cpPlugins::Extensions::Algorithms::LightCompensationFilter< I >::
  82 AfterThreadedGenerateData( )
  83 {
  84 }
  85
  86 #endif // __CPPLUGINS__EXTENSIONS__ALGORITHMS__LIGHTCOMPENSATIONFILTER__HXX__
  87
  88 // eof - $RCSfile$