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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 "itkListSample.h"
#include "itkHistogram.h"
#include "itkSampleToHistogramFilter.h"
int
itkSampleToHistogramFilterTest4(int, char *[])
{
constexpr unsigned int numberOfComponents = 3;
//
// Note:
//
// The following two types are made different here.
//
// The purpose of this test is to verify that the
// MeasurementVectorType can use an integer type for its
// components, while the Histogram can use a float type for
// it measurement type.
//
using VMeasurementType = float; // float type for the samples
using HMeasurementType = float; // float type for the histogram
using MeasurementVectorType = itk::Array<VMeasurementType>;
using SampleType = itk::Statistics::ListSample<MeasurementVectorType>;
using HistogramType = itk::Statistics::Histogram<HMeasurementType, itk::Statistics::DenseFrequencyContainer2>;
using FilterType = itk::Statistics::SampleToHistogramFilter<SampleType, HistogramType>;
using HistogramSizeType = FilterType::HistogramSizeType;
using HistogramMeasurementVectorType = FilterType::HistogramMeasurementVectorType;
auto filter = FilterType::New();
auto sample = SampleType::New();
HistogramMeasurementVectorType minimum(numberOfComponents);
HistogramMeasurementVectorType maximum(numberOfComponents);
minimum[0] = -17.5;
minimum[1] = -19.5;
minimum[2] = -24.5;
maximum[0] = 17.5;
maximum[1] = 19.5;
maximum[2] = 24.5;
HistogramSizeType histogramSize(numberOfComponents);
histogramSize[0] = 36;
histogramSize[1] = 40;
histogramSize[2] = 50;
MeasurementVectorType measure(numberOfComponents);
sample->SetMeasurementVectorSize(numberOfComponents);
// Populate the Sample
for (unsigned int i = 0; i < histogramSize[0]; ++i)
{
measure[0] = static_cast<VMeasurementType>(minimum[0] + i);
for (unsigned int j = 0; j < histogramSize[1]; ++j)
{
measure[1] = static_cast<VMeasurementType>(minimum[1] + j);
for (unsigned int k = 0; k < histogramSize[2]; ++k)
{
measure[2] = static_cast<VMeasurementType>(minimum[2] + k);
sample->PushBack(measure);
}
}
}
filter->SetInput(sample);
// 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 (const 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;
}
filter->SetHistogramSize(histogramSize);
try
{
filter->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
const unsigned int expectedHistogramSize1 = histogramSize[0] * histogramSize[1] * histogramSize[2];
if (histogram->Size() != expectedHistogramSize1)
{
std::cerr << "Histogram Size error" << std::endl;
std::cerr << "We expected " << expectedHistogramSize1 << std::endl;
std::cerr << "We received " << histogram->Size() << std::endl;
return EXIT_FAILURE;
}
HistogramType::ConstIterator histogramItr = histogram->Begin();
HistogramType::ConstIterator histogramEnd = histogram->End();
constexpr unsigned int expectedFrequency1 = 1;
while (histogramItr != histogramEnd)
{
if (histogramItr.GetFrequency() != expectedFrequency1)
{
std::cerr << "Histogram bin error for measure " << std::endl;
std::cerr << histogramItr.GetMeasurementVector() << std::endl;
std::cerr << "Expected frequency = " << expectedFrequency1 << std::endl;
std::cerr << "Computed frequency = " << histogramItr.GetFrequency() << std::endl;
return EXIT_FAILURE;
}
++histogramItr;
}
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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