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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.
*
*=========================================================================*/
// First include the header file to be tested:
#include "itkMeanImageFilter.h"
#include "itkImage.h"
#include "itkVectorImage.h"
#include "itkImageBufferRange.h"
#include <numeric> // For iota.
#include <vector>
#include <gtest/gtest.h>
namespace
{
template <typename TImage>
void
Expect_output_pixels_have_same_value_as_input_when_input_image_is_uniform(
const typename TImage::RegionType & imageRegion,
const typename TImage::PixelType & inputPixelValue)
{
using PixelType = typename TImage::PixelType;
const auto image = TImage::New();
image->SetRegions(imageRegion);
image->SetNumberOfComponentsPerPixel(itk::NumericTraits<PixelType>::GetLength(inputPixelValue));
image->Allocate();
image->FillBuffer(inputPixelValue);
const auto filter = itk::MeanImageFilter<TImage, TImage>::New();
filter->SetInput(image);
filter->Update();
const TImage * const output = filter->GetOutput();
ASSERT_NE(output, nullptr);
for (const PixelType outputPixelValue : itk::MakeImageBufferRange(output))
{
EXPECT_EQ(outputPixelValue, inputPixelValue);
}
}
// Creates a test image, filled with a sequence of natural numbers, 1, 2, 3, ..., N.
template <typename TImage>
typename TImage::Pointer
CreateImageFilledWithSequenceOfNaturalNumbers(const typename TImage::RegionType & imageRegion)
{
using PixelType = typename TImage::PixelType;
const auto image = TImage::New();
image->SetRegions(imageRegion);
image->Allocate();
const auto imageBufferRange = itk::ImageBufferRange{ *image };
std::iota(imageBufferRange.begin(), imageBufferRange.end(), PixelType{ 1 });
return image;
}
template <typename TImage>
void
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers(
const typename TImage::RegionType & imageRegion,
const std::vector<typename TImage::PixelType> & expectedPixelValues)
{
using PixelType = typename TImage::PixelType;
const auto inputImage = CreateImageFilledWithSequenceOfNaturalNumbers<TImage>(imageRegion);
const auto filter = itk::MeanImageFilter<TImage, TImage>::New();
filter->SetInput(inputImage);
filter->Update();
const TImage * const outputImage = filter->GetOutput();
const auto outputImageBufferRange = itk::MakeImageBufferRange(outputImage);
const std::vector<PixelType> outputPixelValues(outputImageBufferRange.cbegin(), outputImageBufferRange.cend());
EXPECT_EQ(outputPixelValues, expectedPixelValues);
}
} // namespace
// Tests that for a uniform input image, the output pixels have the same value as the input pixels.
TEST(MeanImageFilter, OutputSameAsInputForUniformImage)
{
Expect_output_pixels_have_same_value_as_input_when_input_image_is_uniform<itk::Image<int>>(itk::Size<>{ { 5, 6 } },
64);
Expect_output_pixels_have_same_value_as_input_when_input_image_is_uniform<itk::Image<float, 3>>(
itk::Size<3>{ { 3, 4, 5 } }, 0.5f);
float array[] = { 3.14f, 2.71f, 1.41f };
itk::VariableLengthVector<float> v{ array, 3 };
Expect_output_pixels_have_same_value_as_input_when_input_image_is_uniform<itk::VectorImage<float, 3>>(
itk::Size<3>{ { 3, 4, 5 } }, v);
}
// Tests that the output pixel values are as expected for an example input image that is filled with
// the sequence of natural numbers, 1, 2, 3, ...
TEST(MeanImageFilter, ExpectedOutputPixelValuesForSequenceOfNaturalNumbers)
{
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers<itk::Image<int>>(
itk::Size<>{ { 1, 1 } }, { 1 });
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers<itk::Image<int>>(
itk::Size<>{ { 1, 2 } }, { 1, 1 });
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers<itk::Image<int>>(
itk::Size<>{ { 2, 1 } }, { 1, 1 });
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers<itk::Image<int>>(
itk::Size<>{ { 2, 2 } }, { 2, 2, 2, 3 });
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers<itk::Image<int>>(
itk::Size<>{ { 3, 3 } }, { 2, 3, 3, 4, 5, 5, 6, 7, 7 });
Expect_output_has_specified_pixel_values_when_input_has_sequence_of_natural_numbers<itk::Image<int, 3>>(
itk::Size<3>{ { 2, 2, 2 } }, { 3, 3, 4, 4, 4, 5, 5, 5 });
}
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