GDCM  2.2.0
gdcmImageChangePhotometricInterpretation.h
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00001 /*=========================================================================
00002 
00003   Program: GDCM (Grassroots DICOM). A DICOM library
00004 
00005   Copyright (c) 2006-2011 Mathieu Malaterre
00006   All rights reserved.
00007   See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
00008 
00009      This software is distributed WITHOUT ANY WARRANTY; without even
00010      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
00011      PURPOSE.  See the above copyright notice for more information.
00012 
00013 =========================================================================*/
00014 #ifndef GDCMIMAGECHANGEPHOTOMETRICINTERPRETATION_H
00015 #define GDCMIMAGECHANGEPHOTOMETRICINTERPRETATION_H
00016 
00017 #include "gdcmImageToImageFilter.h"
00018 #include "gdcmPhotometricInterpretation.h"
00019 
00020 namespace gdcm
00021 {
00022 
00023 class DataElement;
00028 class GDCM_EXPORT ImageChangePhotometricInterpretation : public ImageToImageFilter
00029 {
00030 public:
00031   ImageChangePhotometricInterpretation():PI() {}
00032   ~ImageChangePhotometricInterpretation() {}
00033 
00035   void SetPhotometricInterpretation(PhotometricInterpretation const &pi) { PI = pi; }
00036   const PhotometricInterpretation &GetPhotometricInterpretation() const { return PI; }
00037 
00039   bool Change();
00040 
00042   template <typename T>
00043   static void RGB2YBR(T ybr[3], const T rgb[3]);
00044   template <typename T>
00045   static void YBR2RGB(T rgb[3], const T ybr[3]);
00046 
00047 protected:
00048   bool ChangeMonochrome();
00049 
00050 private:
00051   PhotometricInterpretation PI;
00052 };
00053 
00054 
00055 // http://en.wikipedia.org/wiki/YCbCr
00056 template <typename T>
00057 void ImageChangePhotometricInterpretation::RGB2YBR(T ybr[3], const T rgb[3])
00058 {
00059 #if 1
00060   ybr[0] =   65.738 * rgb[0] +    129.057 * rgb[1] +    25.064 * rgb[2] + 16;
00061   ybr[1] =  -37.945 * rgb[0] +    -74.494 * rgb[1] +   112.439 * rgb[2] + 128;
00062   ybr[2] =  112.439 * rgb[0] +    -94.154 * rgb[1] +   -18.285 * rgb[2] + 128;
00063 #else
00064 
00065   const double R = rgb[0];
00066   const double G = rgb[1];
00067   const double B = rgb[2];
00068   const double Y  =  .2990 * R + .5870 * G + .1140 * B;
00069   const double CB = -.168736 * R - .331264 * G + .5000 * B + 128;
00070   const double CR =  .5000 * R - .418688 * G - .081312 * B + 128;
00071   //assert( Y >= 0  && Y <= 255 );
00072   //assert( CB >= 0 && CB <= 255 );
00073   //assert( CR >= 0 && CR <= 255 );
00074   ybr[0] = Y  /*+ 0.5*/;
00075   ybr[1] = CB /*+ 0.5*/;
00076   ybr[2] = CR /*+ 0.5*/;
00077 #endif
00078 }
00079 
00080 template <typename T>
00081 void ImageChangePhotometricInterpretation::YBR2RGB(T rgb[3], const T ybr[3])
00082 {
00083 
00084 #if 1
00085  rgb[0] = 298.082 * ((int)ybr[0]-16) +     0.    * ((int)ybr[1]-128) +   408.583 * ((int)ybr[2]-128) - 1. / 256;
00086  rgb[1] = 298.082 * ((int)ybr[0]-16) +  -100.291 * ((int)ybr[1]-128) +  -208.12  * ((int)ybr[2]-128) - 1. / 256;
00087  rgb[2] = 298.082 * ((int)ybr[0]-16) +   516.411 * ((int)ybr[1]-128) +     0.    * ((int)ybr[2]-128) - 1. / 256;
00088 
00089 #else
00090   const double Y  = ybr[0];
00091   const double Cb = ybr[1];
00092   const double Cr = ybr[2];
00093   //const double R =  1.0000e+00 * Y - 3.6820e-05 * CB + 1.4020e+00 * CR;
00094   //const double G =  1.0000e+00 * Y - 3.4411e-01 * CB - 7.1410e-01 * CR;
00095   //const double B =  1.0000e+00 * Y + 1.7720e+00 * CB - 1.3458e-04 * CR;
00096   const double r = Y                    + 1.402   * (Cr-128);
00097   const double g = Y - 0.344136 * (Cb-128) - 0.714136 * (Cr-128);
00098   const double b = Y + 1.772   * (Cb-128);
00099   double R = r < 0 ? 0 : r;
00100   R = R > 255 ? 255 : R;
00101   double G = g < 0 ? 0 : g;
00102   G = G > 255 ? 255 : G;
00103   double B = b < 0 ? 0 : b;
00104   B = B > 255 ? 255 : B;
00105   assert( R >= 0 && R <= 255 );
00106   assert( G >= 0 && G <= 255 );
00107   assert( B >= 0 && B <= 255 );
00108   rgb[0] = ((R < 0 ? 0 : R) > 255 ? 255 : R);
00109   rgb[1] = G;
00110   rgb[2] = B;
00111 #endif
00112 
00113 }
00114 
00115 } // end namespace gdcm
00116 
00117 #endif //GDCMIMAGECHANGEPHOTOMETRICINTERPRETATION_H

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