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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#ifndef GDCMIMAGECHANGEPHOTOMETRICINTERPRETATION_H
#define GDCMIMAGECHANGEPHOTOMETRICINTERPRETATION_H
#include "gdcmImageToImageFilter.h"
#include "gdcmPhotometricInterpretation.h"
namespace gdcm
{
class DataElement;
/**
* \brief ImageChangePhotometricInterpretation class
* \details Class to change the Photometric Interpetation of an input DICOM
*/
class GDCM_EXPORT ImageChangePhotometricInterpretation : public ImageToImageFilter
{
public:
ImageChangePhotometricInterpretation():PI() {}
~ImageChangePhotometricInterpretation() {}
/// Set/Get requested PhotometricInterpretation
void SetPhotometricInterpretation(PhotometricInterpretation const &pi) { PI = pi; }
const PhotometricInterpretation &GetPhotometricInterpretation() const { return PI; }
/// Change
bool Change();
/// colorspace converstion (based on CCIR Recommendation 601-2)
/// -> T.871
template <typename T>
static void RGB2YBR(T ybr[3], const T rgb[3]);
template <typename T>
static void YBR2RGB(T rgb[3], const T ybr[3]);
protected:
bool ChangeMonochrome();
bool ChangeYBR2RGB();
bool ChangeRGB2YBR();
private:
PhotometricInterpretation PI;
};
template <typename T>
static inline int Round(T x)
{
return (int)(x+0.5);
}
template <typename T>
static inline int Clamp(T v)
{
return v < 0 ? 0 : (v > 255 ? 255 : v);
}
template <typename T>
void ImageChangePhotometricInterpretation::RGB2YBR(T ybr[3], const T rgb[3])
{
const double R = rgb[0];
const double G = rgb[1];
const double B = rgb[2];
const int Y = Round( .299 * R + .587 * G + .114 * B );
const int CB = Round((-.299 * R - .587 * G + .886 * B)/1.772 + 128);
const int CR = Round(( .701 * R - .587 * G - .114 * B)/1.402 + 128);
ybr[0] = Clamp(Y );
ybr[1] = Clamp(CB);
ybr[2] = Clamp(CR);
}
template <typename T>
void ImageChangePhotometricInterpretation::YBR2RGB(T rgb[3], const T ybr[3])
{
const double Y = ybr[0];
const double Cb = ybr[1];
const double Cr = ybr[2];
const int R = Round(Y + 1.402 * (Cr-128) );
const int G = Round(Y -( 0.114 * 1.772 * (Cb-128) + 0.299 * 1.402 * (Cr-128))/0.587);
const int B = Round(Y + 1.772 * (Cb-128) );
rgb[0] = Clamp(R);
rgb[1] = Clamp(G);
rgb[2] = Clamp(B);
}
} // end namespace gdcm
#endif //GDCMIMAGECHANGEPHOTOMETRICINTERPRETATION_H
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