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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkImageToHistogramFilterTest3.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm 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 notices for more information.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#include "itkImage.h"
#include "itkScalarImageToHistogramGenerator.h"
#include "itkMinimumMaximumImageFilter.h"
#include "itkImageFileReader.h"
int itkImageToHistogramFilterTest3( int argc, char * argv [] )
{
if( argc < 3 )
{
std::cerr << "Missing command line arguments" << std::endl;
std::cerr << "Usage : " << argv[0] << " inputScalarImageFileName outputHistogramFile.txt" << std::endl;
return EXIT_FAILURE;
}
const unsigned int Dimension = 2;
typedef unsigned char PixelComponentType;
typedef itk::Image< PixelComponentType, Dimension > ScalarImageType;
typedef itk::ImageFileReader< ScalarImageType > ReaderType;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName( argv[1] );
try
{
reader->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Problem encoutered while reading image file : " << argv[1] << std::endl;
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
itk::MinimumMaximumImageFilter<ScalarImageType>::Pointer minmaxFilter
= itk::MinimumMaximumImageFilter<ScalarImageType>::New();
minmaxFilter->SetInput(reader->GetOutput());
minmaxFilter->Update();
const ScalarImageType::PixelType imageMin = minmaxFilter->GetMinimum();
const ScalarImageType::PixelType imageMax = minmaxFilter->GetMaximum();
typedef itk::Statistics::ScalarImageToHistogramGenerator<ScalarImageType>
HistogramGeneratorType;
HistogramGeneratorType::Pointer histogramGenerator
= HistogramGeneratorType::New();
histogramGenerator->SetInput(reader->GetOutput());
const int NumberOfBins = static_cast<unsigned int>( imageMax - imageMin + 1 );
histogramGenerator->SetNumberOfBins( NumberOfBins );
histogramGenerator->SetMarginalScale(1.0);
// BUG revealed. Solution is located at:
// http://public.kitware.com/Bug/view.php?id=10025
histogramGenerator->SetHistogramMin( imageMin );
histogramGenerator->SetHistogramMax( imageMax );
histogramGenerator->Compute();
typedef HistogramGeneratorType::HistogramType HistogramType;
const HistogramType * histogram = histogramGenerator->GetOutput();
std::ofstream outputFile;
outputFile.open( argv[2] );
const unsigned int histogramSize = histogram->Size();
outputFile << "Histogram size " << histogramSize << std::endl;
unsigned int channel = 0; // red channel
outputFile << "Histogram of the scalar component" << std::endl;
for( unsigned int bin=0; bin < histogramSize; bin++ )
{
outputFile << "bin = " << bin << " frequency = ";
outputFile << histogram->GetFrequency( bin, channel ) << std::endl;
}
outputFile.close();
return EXIT_SUCCESS;
}
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