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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkSymmetricSecondRankTensorImageWriteReadTest.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#include <fstream>
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkImage.h"
#include "itkSymmetricSecondRankTensor.h"
#include "itkImageRegionIterator.h"
// Write a 2D SymmetricSecondRankTensor image to file and read it back again.
int itkSymmetricSecondRankTensorImageWriteReadTest( int ac, char* av[] )
{
if(ac < 1)
{
std::cerr << "Usage: " << av[0] << " Input\n";
return EXIT_FAILURE;
}
typedef itk::SymmetricSecondRankTensor<float, 2> TensorPixelType;
typedef itk::Image<TensorPixelType, 2> TensorImageType;
TensorImageType::Pointer tensorImageInput = TensorImageType::New();
TensorImageType::SizeType size;
size.Fill(10);
TensorImageType::IndexType start;
start.Fill(0);
TensorImageType::RegionType region;
region.SetIndex( start );
region.SetSize( 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;
}
typedef itk::ImageFileWriter< TensorImageType > TensorWriterType;
TensorWriterType::Pointer tensorWriter = TensorWriterType::New();
tensorWriter->SetInput( tensorImageInput );
tensorWriter->SetFileName( av[1] );
try
{
tensorWriter->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 tensorImageOutput = tensorReader->GetOutput();
// 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( vcl_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;
}
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