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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 "itkNaryMaximumImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkMath.h"
#include "itkTestingMacros.h"
// Create a namespace in order to avoid conflicts with other tests.
namespace NaryMaximumImageFilterTest
{
// Define the dimension of the images
constexpr unsigned int Dimension = 3;
// Declare the pixel types of the images
using PixelType = float;
// Declare the types of the images
using InputImageType = itk::Image<PixelType, Dimension>;
using OutputImageType = itk::Image<PixelType, Dimension>;
// Declare the type of the index to access images
using IndexType = itk::Index<Dimension>;
// Declare the type of the size
using SizeType = itk::Size<Dimension>;
// Declare the type of the Region
using RegionType = itk::ImageRegion<Dimension>;
// Declare the type of the Iterators
using InImageIteratorType = itk::ImageRegionIteratorWithIndex<InputImageType>;
using OutImageIteratorType = itk::ImageRegionIteratorWithIndex<OutputImageType>;
// Declare the type for the itk::NaryMaximumImageFilter filter
using FilterType = itk::NaryMaximumImageFilter<InputImageType, OutputImageType>;
// Function for image initialization
void
InitializeImage(InputImageType * image, double value)
{
InputImageType::Pointer inputImage(image);
// Define their size, and start index
SizeType size;
size[0] = 2;
size[1] = 2;
size[2] = 2;
IndexType start;
start.Fill(0);
RegionType region;
region.SetIndex(start);
region.SetSize(size);
inputImage->SetRegions(region);
inputImage->Allocate();
InImageIteratorType it(inputImage, inputImage->GetRequestedRegion());
it.GoToBegin();
while (!it.IsAtEnd())
{
it.Set(value);
++it;
}
}
// Function for image printing
void
PrintImage(InputImageType * image, const char *)
{
// Create an iterator for going through the image
InImageIteratorType it(image, image->GetRequestedRegion());
it.GoToBegin();
// Print the content of the image
while (!it.IsAtEnd())
{
std::cout << it.Get() << std::endl;
++it;
}
}
} // end namespace NaryMaximumImageFilterTest
int
itkNaryMaximumImageFilterTest(int, char *[])
{
// It is safe to open the namespace here because
// the symbols will not be exposed outside this function
using namespace NaryMaximumImageFilterTest;
// Create two images
auto inputImageA = InputImageType::New();
auto inputImageB = InputImageType::New();
static constexpr int minValue = 12;
static constexpr int maxValue = 13;
InitializeImage(inputImageA, minValue);
InitializeImage(inputImageB, maxValue);
PrintImage(inputImageA, "Input image A");
PrintImage(inputImageB, "Input image B");
// Create the itk::NaryMaximumImageFilter filter
auto filter = FilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, NaryMaximumImageFilter, NaryFunctorImageFilter);
// Set the input images
filter->SetInput(0, inputImageA);
filter->SetInput(1, inputImageB);
filter->SetFunctor(filter->GetFunctor());
// Execute the filter
filter->Update();
// Get the filter output
OutputImageType::Pointer outputImage = filter->GetOutput();
PrintImage(outputImage, "Resulting image 1");
OutImageIteratorType it(outputImage, outputImage->GetRequestedRegion());
it.GoToBegin();
while (!it.IsAtEnd())
{
if (itk::Math::NotExactlyEquals(it.Get(), maxValue))
{
std::cerr << "Test Failed!" << std::endl;
return EXIT_FAILURE;
}
++it;
}
// Now try it the other way
InitializeImage(inputImageA, minValue);
InitializeImage(inputImageB, maxValue);
filter->SetInput(1, inputImageA);
filter->SetInput(0, inputImageB);
filter->InPlaceOff(); // let's make sure this works too, while we're at it...
// Execute the filter
filter->Update();
PrintImage(outputImage, "Resulting image 2");
OutImageIteratorType it2(outputImage, outputImage->GetRequestedRegion());
it2.GoToBegin();
while (!it2.IsAtEnd())
{
if (itk::Math::NotExactlyEquals(it2.Get(), maxValue))
{
std::cerr << "Test Failed!" << std::endl;
return EXIT_FAILURE;
}
++it2;
}
std::cerr << "Test Passed!" << std::endl;
// All objects should be automatically destroyed at this point
return EXIT_SUCCESS;
}
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