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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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
*
* http://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"
int itkSymmetricSecondRankTensorImageReadTest( int ac, char* av[] )
{
if(ac < 1)
{
std::cerr << "Usage: " << av[0] << " Input\n";
return EXIT_FAILURE;
}
typedef itk::SymmetricSecondRankTensor<float, 3> TensorPixelType;
typedef itk::Image<TensorPixelType, 3> TensorImageType;
typedef itk::Matrix<float,3,3> MatrixPixelType;
typedef itk::Image<MatrixPixelType, 3> MatrixImageType;
MatrixImageType::Pointer matrixImage = MatrixImageType::New();
MatrixImageType::SizeType size;
size.Fill(10);
MatrixImageType::IndexType start;
start.Fill(0);
MatrixImageType::RegionType region;
region.SetIndex( start );
region.SetSize( 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;
}
typedef itk::ImageFileWriter< MatrixImageType > MatrixWriterType;
MatrixWriterType::Pointer matrixWriter = MatrixWriterType::New();
matrixWriter->SetInput( matrixImage );
matrixWriter->SetFileName( av[1] );
try
{
matrixWriter->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
typedef itk::ImageFileReader< TensorImageType > TensorReaderType;
TensorReaderType::Pointer tensorReader = TensorReaderType::New();
tensorReader->SetFileName( av[1] );
try
{
tensorReader->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
TensorImageType::ConstPointer tensorImage = tensorReader->GetOutput();
// 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( std::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;
}
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