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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 <fstream>
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkTestingMacros.h"
// Write a 2D SymmetricSecondRankTensor image to file and read it back again.
int
itkSymmetricSecondRankTensorImageWriteReadTest(int argc, char * argv[])
{
if (argc < 1)
{
std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " Input\n";
return EXIT_FAILURE;
}
using TensorPixelType = itk::SymmetricSecondRankTensor<float, 2>;
using TensorImageType = itk::Image<TensorPixelType, 2>;
auto tensorImageInput = TensorImageType::New();
TensorImageType::SizeType size;
size.Fill(10);
TensorImageType::IndexType start;
start.Fill(0);
TensorImageType::RegionType region{ start, size };
tensorImageInput->SetRegions(region);
tensorImageInput->Allocate();
TensorPixelType tensorPixelInput;
tensorPixelInput(0, 0) = 1;
tensorPixelInput(0, 1) = 2;
tensorPixelInput(1, 1) = 3;
itk::ImageRegionIterator<TensorImageType> itr(tensorImageInput, region);
itr.GoToBegin();
while (!itr.IsAtEnd())
{
itr.Set(tensorPixelInput);
for (unsigned int i = 0; i < 3; ++i)
{
tensorPixelInput[i]++;
}
++itr;
}
try
{
itk::WriteImage(tensorImageInput, argv[1]);
const TensorImageType::ConstPointer tensorImageOutput = itk::ReadImage<TensorImageType>(argv[1]);
// Compare the read values to the original values
const float tolerance = 1e-5;
itk::ImageRegionConstIterator<TensorImageType> inIt(tensorImageInput, region);
itk::ImageRegionConstIterator<TensorImageType> outIt(tensorImageOutput, region);
inIt.GoToBegin();
outIt.GoToBegin();
while (!outIt.IsAtEnd())
{
tensorPixelInput = inIt.Get();
const TensorPixelType tensorPixelOutput = outIt.Get();
for (unsigned int i = 0; i < 3; ++i)
{
if (itk::Math::abs(tensorPixelInput[i] - tensorPixelOutput[i]) > tolerance)
{
std::cerr << "Tensor read does not match expected values " << std::endl;
std::cerr << "Index " << inIt.GetIndex() << std::endl;
std::cerr << "Tensor input value " << std::endl << tensorPixelInput << std::endl;
std::cerr << "Tensor output value " << std::endl << tensorPixelOutput << std::endl;
return EXIT_FAILURE;
}
}
++inIt;
++outIt;
}
return EXIT_SUCCESS;
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
}
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