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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 "itkHistogram.h"
#include "itkSampleToHistogramFilter.h"
#include "itkImageToListSampleFilter.h"
#include "itkImageFileReader.h"
int itkSampleToHistogramFilterTest5(int argc, char *argv[] )
{
const unsigned int imageDimension = 2;
if( argc < 2 )
{
std::cerr << "Missing arguments" << std::endl;
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFilename " << std::endl;
return EXIT_FAILURE;
}
//
// Note:
//
// The purpose of this test is to verify that the
// SampleToHistogramFilter can be used for generating the
// histogram of an image.
//
typedef unsigned char VMeasurementType; // type for the samples
typedef float HMeasurementType; // type for the histogram
typedef itk::RGBPixel< VMeasurementType > PixelType;
const unsigned int numberOfComponents = 3;
typedef itk::Image< PixelType, imageDimension > ImageType;
typedef itk::Statistics::ImageToListSampleFilter<
ImageType > ImageToListSampleFilterType;
typedef ImageToListSampleFilterType::ListSampleType SampleType;
typedef itk::Statistics::Histogram< HMeasurementType,
itk::Statistics::DenseFrequencyContainer2 > HistogramType;
typedef itk::Statistics::SampleToHistogramFilter<
SampleType, HistogramType > FilterType;
typedef HistogramType::MeasurementVectorType MeasurementVectorType;
typedef FilterType::HistogramSizeType HistogramSizeType;
typedef itk::ImageFileReader< ImageType > ReaderType;
ReaderType::Pointer reader = ReaderType::New();
ImageToListSampleFilterType::Pointer imageToSampleFilter =
ImageToListSampleFilterType::New();
FilterType::Pointer filter = FilterType::New();
reader->SetFileName( argv[1] );
imageToSampleFilter->SetInput( reader->GetOutput() );
filter->SetInput( imageToSampleFilter->GetOutput() );
// Test exception when calling Update() without having
// defined the size of the histogram in the filter.
try
{
filter->Update();
std::cerr << "Failure to throw expected exception due to lack";
std::cerr << " of calling SetHistogramSize() in the filter ";
return EXIT_FAILURE;
}
catch( itk::ExceptionObject & )
{
std::cout << "Expected exception received" << std::endl;
}
const HistogramType * histogram = filter->GetOutput();
if( histogram->Size() != 0 )
{
std::cerr << "Histogram Size should have been zero" << std::endl;
return EXIT_FAILURE;
}
HistogramSizeType histogramSize( numberOfComponents );
histogramSize[0] = 256;
histogramSize[1] = 256;
histogramSize[2] = 256;
filter->SetHistogramSize( histogramSize );
try
{
filter->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
const unsigned int expectedHistogramSize =
histogramSize[0] * histogramSize[1] * histogramSize[2];
if( histogram->Size() != expectedHistogramSize )
{
std::cerr << "Histogram Size should have been " << expectedHistogramSize << std::endl;
std::cerr << " but it actually is " << histogram->Size() << std::endl;
return EXIT_FAILURE;
}
HistogramType::ConstIterator histogramItr = histogram->Begin();
HistogramType::ConstIterator histogramEnd = histogram->End();
typedef itk::NumericTraits< VMeasurementType >::PrintType PrintType;
unsigned int count = 0;
while( histogramItr != histogramEnd )
{
if( histogramItr.GetFrequency() != 0 )
{
count++;
if (count % 1000)
{
MeasurementVectorType measurementVector = histogramItr.GetMeasurementVector();
std::cout << static_cast< PrintType >( measurementVector[0] ) << " ";
std::cout << static_cast< PrintType >( measurementVector[1] ) << " ";
std::cout << static_cast< PrintType >( measurementVector[2] ) << " ";
std::cout << "frequency: " << histogramItr.GetFrequency() << std::endl;
}
}
++histogramItr;
}
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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