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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"
int
itkSymmetricSecondRankTensorImageReadTest(int argc, char * argv[])
{
if (argc < 1)
{
std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " Input\n";
return EXIT_FAILURE;
}
using TensorPixelType = itk::SymmetricSecondRankTensor<float, 3>;
using TensorImageType = itk::Image<TensorPixelType, 3>;
using MatrixPixelType = itk::Matrix<float, 3, 3>;
using MatrixImageType = itk::Image<MatrixPixelType, 3>;
auto matrixImage = MatrixImageType::New();
MatrixImageType::SizeType size;
size.Fill(10);
MatrixImageType::IndexType start;
start.Fill(0);
MatrixImageType::RegionType region{ start, size };
matrixImage->SetRegions(region);
matrixImage->Allocate();
MatrixPixelType matrixPixel;
matrixPixel[0][0] = 1;
matrixPixel[0][1] = 2;
matrixPixel[0][2] = 3;
matrixPixel[1][0] = 2;
matrixPixel[1][1] = 4;
matrixPixel[1][2] = 5;
matrixPixel[2][0] = 3;
matrixPixel[2][1] = 5;
matrixPixel[2][2] = 6;
itk::ImageRegionIterator<MatrixImageType> itr(matrixImage, region);
itr.GoToBegin();
while (!itr.IsAtEnd())
{
itr.Set(matrixPixel);
for (unsigned int i = 0; i < 3; ++i)
{
for (unsigned int j = 0; j < 3; ++j)
{
matrixPixel[i][j]++;
}
}
++itr;
}
try
{
itk::WriteImage(matrixImage, argv[1]);
const TensorImageType::ConstPointer tensorImage = itk::ReadImage<TensorImageType>(argv[1]);
// Compare the read values to the original values
const float tolerance = 1e-5;
itk::ImageRegionConstIterator<TensorImageType> tItr(tensorImage, region);
itk::ImageRegionConstIterator<MatrixImageType> mItr(matrixImage, region);
tItr.GoToBegin();
mItr.GoToBegin();
while (!mItr.IsAtEnd())
{
matrixPixel = mItr.Get();
const TensorPixelType tensorPixel = tItr.Get();
for (unsigned int i = 0; i < 3; ++i)
{
for (unsigned int j = 0; j < 3; ++j)
{
if (itk::Math::abs(matrixPixel[i][j] - tensorPixel(i, j)) > tolerance)
{
std::cerr << "Tensor read does not match expected values " << std::endl;
std::cerr << "Index " << tItr.GetIndex() << std::endl;
std::cerr << "Tensor value " << std::endl << tensorPixel << std::endl;
std::cerr << "Matrix value " << std::endl << matrixPixel << std::endl;
return EXIT_FAILURE;
}
}
}
++mItr;
++tItr;
}
return EXIT_SUCCESS;
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
}
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