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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include "itkScalarImageToHistogramGenerator.h"
#include "itkMinimumMaximumImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkHistogramToEntropyImageFilter.h"
int itkHistogramToEntropyImageFilterTest1( int argc, char * argv [] )
{
if( argc < 3 )
{
std::cerr << "Missing command line arguments" << std::endl;
std::cerr << "Usage : " << argv[0] << " inputScalarImageFileName outputImage" << 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);
histogramGenerator->SetHistogramMin( imageMin );
histogramGenerator->SetHistogramMax( imageMax );
histogramGenerator->Compute();
typedef HistogramGeneratorType::HistogramType HistogramType;
const HistogramType * histogram = histogramGenerator->GetOutput();
typedef itk::HistogramToEntropyImageFilter<
HistogramType > HistogramToImageFilterType;
HistogramToImageFilterType::Pointer histogramToImageFilter = HistogramToImageFilterType::New();
histogramToImageFilter->SetInput( histogram );
typedef HistogramToImageFilterType::OutputImageType OutputImageType;
typedef itk::ImageFileWriter< OutputImageType > WriterType;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName( argv[2] );
writer->SetInput( histogramToImageFilter->GetOutput() );
try
{
writer->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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