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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 "itkAtan2ImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkMath.h"
#include "itkTestingMacros.h"
int
itkAtan2ImageFilterTest(int, char *[])
{
// Define the dimension of the images
constexpr unsigned int ImageDimension = 3;
// Declare the pixel types of the images
using PixelType = float;
// Declare the types of the images
using InputImageType = itk::Image<PixelType, ImageDimension>;
using OutputImageType = itk::Image<PixelType, ImageDimension>;
// Declare appropriate Iterator types for each image
using InputIteratorType = itk::ImageRegionIteratorWithIndex<InputImageType>;
using OutputIteratorType = itk::ImageRegionIteratorWithIndex<OutputImageType>;
// Declare the type of the index to access images
using IndexType = itk::Index<ImageDimension>;
// Declare the type of the size
using SizeType = itk::Size<ImageDimension>;
// Declare the type of the Region
using RegionType = itk::ImageRegion<ImageDimension>;
// Create two images
auto sinImage = InputImageType::New();
auto cosImage = InputImageType::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 Sinus Image
sinImage->SetRegions(region);
sinImage->Allocate();
// Initialize Cosinus Image
cosImage->SetRegions(region);
cosImage->Allocate();
// Create one iterator for the Input Image (this is a light object)
InputIteratorType it1(sinImage, sinImage->GetBufferedRegion());
// Initialize the content of Image A
const double sinValue = std::sin(itk::Math::pi / 6.0);
it1.GoToBegin();
while (!it1.IsAtEnd())
{
it1.Set(sinValue);
++it1;
}
// Create one iterator for the Input Image (this is a light object)
InputIteratorType it2(cosImage, cosImage->GetBufferedRegion());
// Initialize the content of Image A
const double cosValue = std::cos(itk::Math::pi / 6.0);
it2.GoToBegin();
while (!it2.IsAtEnd())
{
it2.Set(cosValue);
++it2;
}
// Declare the type for the Atan filter
using FilterType = itk::Atan2ImageFilter<InputImageType, InputImageType, OutputImageType>;
// Create the Filter
auto filter = FilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, Atan2ImageFilter, BinaryGeneratorImageFilter);
// Set the input images
filter->SetInput1(sinImage);
filter->SetInput2(cosImage);
// Get the filter output
OutputImageType::Pointer outputImage = filter->GetOutput();
// Execute the filter
filter->Update();
// Create an iterator for going through the image output
OutputIteratorType ot(outputImage, outputImage->GetRequestedRegion());
// Check the content of the result image
const OutputImageType::PixelType epsilon = 1e-6;
ot.GoToBegin();
it1.GoToBegin();
it2.GoToBegin();
while (!ot.IsAtEnd())
{
const InputImageType::PixelType input1 = it1.Get();
const InputImageType::PixelType input2 = it2.Get();
const OutputImageType::PixelType output = ot.Get();
const OutputImageType::PixelType atan2 = std::atan2(input1, input2);
if (!itk::Math::FloatAlmostEqual(atan2, output, 10, epsilon))
{
std::cerr.precision(static_cast<int>(itk::Math::abs(std::log10(epsilon))));
std::cerr << "Error " << std::endl;
std::cerr << " std::atan2( " << input1 << ", " << input2 << ") = " << atan2 << std::endl;
std::cerr << " differs from " << output;
std::cerr << " by more than " << epsilon << std::endl;
return EXIT_FAILURE;
}
++ot;
++it1;
}
return EXIT_SUCCESS;
}
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