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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 "itkDivideImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkMath.h"
#include "itkTestingMacros.h"
int
itkDivideImageFilterTest(int, char *[])
{
// 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 InputImageType1 = itk::Image<PixelType, Dimension>;
using InputImageType2 = itk::Image<PixelType, Dimension>;
using OutputImageType = itk::Image<PixelType, Dimension>;
// Declare appropriate Iterator types for each image
using OutputImageIteratorType = itk::ImageRegionIteratorWithIndex<OutputImageType>;
// 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>;
// Create two images
auto inputImageA = InputImageType1::New();
auto inputImageB = InputImageType2::New();
// Define their size, and start index
SizeType size;
size[0] = 2;
size[1] = 2;
size[2] = 2;
IndexType start;
start[0] = 0;
start[1] = 0;
start[2] = 0;
RegionType region;
region.SetIndex(start);
region.SetSize(size);
// Initialize Image A
inputImageA->SetRegions(region);
inputImageA->Allocate();
// Initialize Image B
inputImageB->SetRegions(region);
inputImageB->Allocate();
// Initialize the content of Image A
constexpr InputImageType1::PixelType valueA = 2.0;
inputImageA->FillBuffer(valueA);
// Initialize the content of Image B
constexpr InputImageType2::PixelType valueB = 3.0;
inputImageB->FillBuffer(valueB);
// Declare the type for the DivideImageFilter filter
using FilterType = itk::DivideImageFilter<InputImageType1, InputImageType2, OutputImageType>;
// Create the filter
auto filter = FilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, DivideImageFilter, BinaryGeneratorImageFilter);
// Set the input images
filter->SetInput1(inputImageA);
filter->SetInput2(inputImageB);
// Execute the filter
ITK_TRY_EXPECT_NO_EXCEPTION(filter->Update());
// Get the filter output
OutputImageType::Pointer outputImage = filter->GetOutput();
// Create an iterator for going through the image output
OutputImageIteratorType oIt(outputImage, outputImage->GetBufferedRegion());
// Check the content of the result image
//
const auto expectedValue = static_cast<OutputImageType::PixelType>(valueA / valueB);
const OutputImageType::PixelType epsilon = 1e-6;
while (!oIt.IsAtEnd())
{
if (!itk::Math::FloatAlmostEqual(oIt.Get(), expectedValue, 2, epsilon))
{
std::cerr.precision(static_cast<int>(itk::Math::abs(std::log10(epsilon))));
std::cerr << "Test failed!" << std::endl;
std::cerr << "Error in pixel value at index [" << oIt.GetIndex() << ']' << std::endl;
std::cerr << "Expected value " << expectedValue << std::endl;
std::cerr << " differs from " << oIt.Get();
std::cerr << " by more than " << epsilon << std::endl;
return EXIT_FAILURE;
}
++oIt;
}
// Check for exception if constant is 0
filter->SetInput2(0.0);
ITK_TRY_EXPECT_EXCEPTION(filter->Update());
// All objects should be automatically destroyed at this point
std::cout << "Test finished." << std::endl;
return EXIT_SUCCESS;
}
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