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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 <limits>
#include <cstdlib> // atof
static bool check_roundtrip(const gdcm::PixelFormat & pf )
{
gdcm::Rescaler r;
r.SetIntercept( 0. );
r.SetSlope( 1. );
r.SetPixelFormat( pf );
r.SetMinMaxForPixelType((double)pf.GetMin(),(double)pf.GetMax());
const gdcm::PixelFormat outputpt = r.ComputePixelTypeFromMinMax();
if( outputpt != pf ) return false;
return true;
}
int TestRescaler1(int, char *[])
{
gdcm::Rescaler ir;
/*
gdcmData/MR-MONO2-12-shoulder.dcm
(gdb) p intercept
$1 = 6.0999999999999999e-05
(gdb) p slope
$2 = 3.774114
(gdb) p in[i]
$3 = 3.77417493
...
p (in[i] - intercept)/slope
$7 = 0.99999998109891775
$10 = {Intercept = 6.0999999999999999e-05, Slope = 3.774114, PF = {SamplesPerPixel = 1, BitsAllocated = 32, BitsStored = 32, HighBit = 31, PixelRepresentation = 3}, ScalarRangeMin = 6.0999998822808266e-05,
ScalarRangeMax = 247336.561051}
*/
// (0028,1052) DS [0.000061] # 8, 1 RescaleIntercept
// (0028,1053) DS [3.774114] # 8, 1 RescaleSlope
const double intercept = atof( "0.000061" );
const double slope = atof( "3.774114" );
ir.SetIntercept( intercept );
ir.SetSlope( slope );
ir.SetPixelFormat( gdcm::PixelFormat::FLOAT64 );
const double smin = 6.0999998822808266e-05;
const double smax = 247336.561051;
ir.SetMinMaxForPixelType( smin, smax );
double outref[] = { 0 };
{
char *copy = (char*)outref;
const uint16_t in[] = { 1 };
const char *tempimage = (const char*)in;
size_t vtklen = sizeof(in);
ir.SetPixelFormat( gdcm::PixelFormat::UINT16 );
bool b = ir.Rescale(copy,tempimage,vtklen);
if( !b ) return 1;
std::cout << outref[0] << std::endl;
}
ir.SetPixelFormat( gdcm::PixelFormat::FLOAT64 );
uint16_t out[] = { 0 };
char *copy = (char*)out;
//const double in[] = { 3.77417493 };
const double in[] = { 3.774175 };
if( outref[0] != in[0] )
{
std::cerr << "Wrong input/output:" << std::endl;
std::cerr << outref[0] << " vs " << in[0] << std::endl;
std::cerr << (outref[0] - in[0]) << std::endl;
return 1;
}
const char *tempimage = (const char*)in;
size_t vtklen = sizeof(in);
ir.InverseRescale(copy,tempimage,vtklen);
std::cout << out[0] << std::endl;
if( out[0] != 1 )
{
return 1;
}
// Let's make sure that rescaler works in the simplest case
// it should be idempotent:
{
gdcm::PixelFormat pixeltype = gdcm::PixelFormat::INT16;
gdcm::Rescaler r;
r.SetIntercept( 0.0 );
r.SetSlope( 1.0 );
r.SetPixelFormat( pixeltype );
gdcm::PixelFormat::ScalarType outputpt;
outputpt = r.ComputeInterceptSlopePixelType();
if( outputpt != pixeltype )
{
return 1;
}
if( ! (outputpt == pixeltype) )
{
return 1;
}
}
{
gdcm::PixelFormat::ScalarType outputpt ;
double shift = -1024;
double scale = 1;
// gdcmData/CT-MONO2-16-ort.dcm
gdcm::PixelFormat pixeltype( 1, 16, 16, 15, 1 );
gdcm::Rescaler r;
r.SetIntercept( shift );
r.SetSlope( scale );
r.SetPixelFormat( pixeltype );
outputpt = r.ComputeInterceptSlopePixelType();
// min,max = [-33792, 31743]
// we need at least int32 to store that
if( outputpt != gdcm::PixelFormat::INT32 )
{
return 1;
}
// let's pretend image is really the full range:
// FIXME: I think it is ok to compute this way since shift is double anyway:
r.SetMinMaxForPixelType(std::numeric_limits<int16_t>::min() + shift,std::numeric_limits<int16_t>::max() + shift );
gdcm::PixelFormat pf2 = r.ComputePixelTypeFromMinMax();
if( pf2 != pixeltype )
{
return 1;
}
}
// ComputePixelTypeFromMinMax()
{
if( !check_roundtrip(gdcm::PixelFormat(1,16,12,11,0) ) ) return 1;
if( !check_roundtrip(gdcm::PixelFormat(1,16,12,11,1) ) ) return 1;
if( !check_roundtrip(gdcm::PixelFormat(1,8,8,7,0) ) ) return 1;
if( !check_roundtrip(gdcm::PixelFormat(1,8,8,7,1) ) ) return 1;
}
return 0;
}
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