lib/cpExtensions/Algorithms/RGBToYPbPrFunction.h

   1 // -------------------------------------------------------------------------
   2 // @author Leonardo Florez-Valencia (florez-l@javeriana.edu.co)
   3 // -------------------------------------------------------------------------
   4
   5 #ifndef __CPEXTENSIONS__ALGORITHMS__RGBTOYPBPRFUNCTION__H__
   6 #define __CPEXTENSIONS__ALGORITHMS__RGBTOYPBPRFUNCTION__H__
   7
   8 #include <cmath>
   9 #include <limits>
  10 #include <vnl/vnl_math.h>
  11 #include <vnl/vnl_matrix.h>
  12
  13 #include <itkRGBPixel.h>
  14 #include <itkMatrix.h>
  15 #include <itkVector.h>
  16
  17 namespace cpExtensions
  18 {
  19   namespace Algorithms
  20   {
  21     /**
  22      */
  23     template< class O >
  24     struct RGBToYPbPrFunction
  25     {
  26       typedef RGBToYPbPrFunction  Self;
  27       typedef itk::Vector< O, 3 > TOutPixel;
  28
  29       template< class Tr, class Tg, class Tb >
  30       TOutPixel operator()( const Tr& r, const Tg& g, const Tb& b ) const
  31         {
  32           static const O M[] =
  33             {
  34               O(  0.2990 ), O(  0.5870 ), O(  0.1140 ),
  35               O( -0.1687 ), O( -0.3313 ), O(  0.5000 ),
  36               O(  0.5000 ), O( -0.4187 ), O( -0.0813 )
  37             };
  38           static const vnl_matrix< O > vM( M, 3, 3 );
  39           static const itk::Matrix< O, 3, 3 > iM( vM );
  40
  41           TOutPixel rgb;
  42           rgb[ 0 ] = O( r );
  43           rgb[ 1 ] = O( g );
  44           rgb[ 2 ] = O( b );
  45           return( iM * rgb );
  46         }
  47
  48       template< class C >
  49       TOutPixel operator()( const itk::RGBPixel< C >& rgb ) const
  50         {
  51           return(
  52             this->operator()(
  53               rgb.GetRed( ), rgb.GetGreen( ), rgb.GetBlue( )
  54               )
  55             );
  56         }
  57     };
  58
  59   } // ecapseman
  60
  61 } // ecapseman
  62
  63 #endif // __CPEXTENSIONS__ALGORITHMS__RGBTOYPBPRFUNCTION__H__
  64
  65 // eof - $RCSfile$