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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.
=========================================================================*/
#include "gdcmRescaler.h"
#include <vector>
#include <limits>
template < typename T >
struct TypeToPixelFormat;
template<> struct TypeToPixelFormat<double> { enum { Type = gdcm::PixelFormat::FLOAT64 }; };
template<> struct TypeToPixelFormat<float> { enum { Type = gdcm::PixelFormat::FLOAT32 }; };
template<> struct TypeToPixelFormat<short> { enum { Type = gdcm::PixelFormat::INT16 }; };
template<> struct TypeToPixelFormat<unsigned short> { enum { Type = gdcm::PixelFormat::UINT16 }; };
template<> struct TypeToPixelFormat<unsigned char> { enum { Type = gdcm::PixelFormat::UINT8 }; };
template<> struct TypeToPixelFormat<char> { enum { Type = gdcm::PixelFormat::INT8 }; };
template<> struct TypeToPixelFormat<int> { enum { Type = gdcm::PixelFormat::INT32 }; };
template <typename input_pixel, typename output_pixel>
bool TestRescaler2Func(
const double intercept,
const double slope,
const unsigned short bitsallocated,
const unsigned short bitsstored,
const unsigned short pixelrepresentation,
const bool best_fit
)
{
const gdcm::PixelFormat pixeltype(1,bitsallocated,bitsstored,
(unsigned short)(bitsstored-1),pixelrepresentation);
uint8_t ps = pixeltype.GetPixelSize();
// programmer error:
if( ps != sizeof( input_pixel ) ) return false;
if( pixelrepresentation ) // signed
{
if( std::numeric_limits<input_pixel>::min() == 0 ) return false;
}
else
{
if( std::numeric_limits<input_pixel>::min() != 0 ) return false;
}
gdcm::Rescaler r;
r.SetIntercept( intercept );
r.SetSlope( slope );
r.SetPixelFormat( pixeltype );
const int64_t min = pixeltype.GetMin();
const int64_t max = pixeltype.GetMax();
gdcm::PixelFormat::ScalarType outputpt;
outputpt = r.ComputeInterceptSlopePixelType();
gdcm::PixelFormat::ScalarType targetpixeltype =
(gdcm::PixelFormat::ScalarType)TypeToPixelFormat<output_pixel>::Type;
if( best_fit )
{
if( targetpixeltype != outputpt )
{
return false;
}
}
else
{
if( targetpixeltype == outputpt )
{
return false;
}
}
r.SetTargetPixelType( targetpixeltype );
r.SetUseTargetPixelType(true);
std::vector<input_pixel> values;
const int nvalues = 1 << bitsstored;
values.reserve( nvalues );
for( int i = 0; i < nvalues; ++i )
{
//values.push_back( (input_pixel)(std::numeric_limits<input_pixel>::min() + i) );
values.push_back( (input_pixel)(min + i) );
}
std::vector<output_pixel> output;
output.resize( nvalues );
if( !r.Rescale((char*)output.data(),(char*)values.data(),nvalues * sizeof( values[0] ) ) )
return false;
// get the min/max:
double min2 = (double)output[0];
double max2 = (double)output[nvalues-1];
if( min2 > max2 ) return false;
if( intercept == 0 && slope == 1 )
{
if( min != min2 ) return false;
if( max != max2 ) return false;
}
gdcm::Rescaler ir;
ir.SetIntercept( intercept );
ir.SetSlope( slope );
ir.SetPixelFormat( targetpixeltype );
ir.SetMinMaxForPixelType( min2, max2 );
const gdcm::PixelFormat pf2 = ir.ComputePixelTypeFromMinMax();
if( pf2 != pixeltype ) return false;
std::vector<input_pixel> check;
check.resize( nvalues );
if( check == values ) // dummy check
return false;
if( !ir.InverseRescale((char*)check.data(),(char*)output.data(), nvalues * sizeof( output[0] ) ) )
return false;
if( check != values )
return false;
return true;
}
int TestRescaler2(int, char *[])
{
{
double intercept = 0.000061;
double slope = 3.774114;
// Case 1.
// gdcmData/MR-MONO2-12-shoulder.dcm
// (0028,0100) US 16 # 2,1 Bits Allocated
// (0028,0101) US 12 # 2,1 Bits Stored
// (0028,0102) US 11 # 2,1 High Bit
// (0028,0103) US 0 # 2,1 Pixel Representation
// [...]
// (0028,1052) DS [0.000061] # 8,1 Rescale Intercept
// (0028,1053) DS [3.774114] # 8,1 Rescale Slope
if( !TestRescaler2Func<unsigned short,double>(intercept, slope,16,12,0,true) ) return 1;
// Case 2.
// use float instead of default double
if( !TestRescaler2Func<unsigned short,float>(intercept, slope,16,12,0,false) ) return 1;
}
{
double intercept = 0;
double slope = 1;
// Case 3.
if( !TestRescaler2Func<unsigned short,double>(intercept, slope,16,12,0,false) ) return 1;
// Case 4.
if( !TestRescaler2Func<unsigned short,float>(intercept, slope,16,12,0,false) ) return 1;
// Case 5. best fit
if( !TestRescaler2Func<unsigned short,unsigned short>(intercept, slope,16,12,0,true) ) return 1;
// Case 6. unsigned char:
if( !TestRescaler2Func<unsigned char,unsigned char>(intercept,slope,8,8,0,true) ) return 1;
// Case 7. char
if( !TestRescaler2Func<unsigned char,char>(intercept,slope,8,7,0,false) ) return 1;
}
{
double intercept = 0;
double slope = 1;
// Case 8.
if( !TestRescaler2Func<short,double>(intercept,slope,16,12,1,false) ) return 1;
// Case 9.
if( !TestRescaler2Func<short,float>(intercept, slope,16,12,1,false) ) return 1;
// Case 10. best fit
if( !TestRescaler2Func<short,short>(intercept, slope,16,12,1,true) ) return 1;
// Case 11. unsigned char:
if( !TestRescaler2Func<char,char>(intercept,slope,8,8,1,true) ) return 1;
// Case 12. char
if( !TestRescaler2Func<char,char>(intercept,slope,8,7,1,true) ) return 1;
}
{
double intercept = -1024;
double slope = 1;
// Case 13.
if( !TestRescaler2Func<unsigned short,short>(intercept, slope,16,12,0,true) ) return 1;
// Case 14.
if( !TestRescaler2Func<unsigned short,int>(intercept, slope,16,12,0,false) ) return 1;
// Case 15.
if( !TestRescaler2Func<unsigned char,short>(intercept, slope,8,8,0,true) ) return 1;
// Case 16.
if( !TestRescaler2Func<unsigned char,int>(intercept, slope,8,8,0,false) ) return 1;
}
return 0;
}
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