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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkLargeImageWriteReadTest.cxx,v $
Language: C++
Date: $Date: 2008-04-09 20:42:37 $xgoto-l
Version: $Revision: 1.5 $
Copyright (c) 2002 Insight 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 "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkImageFileReader.h"
#include "itkImageRegionIterator.h"
#include "itkTimeProbesCollectorBase.h"
int itkLargeImageWriteReadTest(int ac, char* av[])
{
if (ac < 3)
{
std::cout << "usage: itkIOTests itkLargeImageWriteReadTest outputFileName numberOfPixelsInOneDimension" << std::endl;
return EXIT_FAILURE;
}
typedef unsigned short PixelType;
typedef itk::Image<PixelType,2> ImageType;
typedef itk::ImageFileWriter< ImageType > WriterType;
typedef itk::ImageFileReader< ImageType > ReaderType;
ImageType::Pointer image = ImageType::New();
ImageType::RegionType region;
ImageType::IndexType index;
ImageType::SizeType size;
itk::TimeProbesCollectorBase chronometer;
const unsigned long numberOfPixelsInOneDimension = atol( av[2] );
size.Fill( numberOfPixelsInOneDimension );
index.Fill(0);
region.SetSize(size);
region.SetIndex(index);
image->SetRegions(region);
const unsigned long sizeInMegaBytes =
static_cast< unsigned long >(
( sizeof(PixelType) * numberOfPixelsInOneDimension * numberOfPixelsInOneDimension ) /
( 1024.0 * 1024.0 ) );
std::cout << "Trying to allocate an image of size " << sizeInMegaBytes << " Mb " << std::endl;
chronometer.Start("Allocate");
image->Allocate();
chronometer.Stop("Allocate");
std::cout << "Initializing pixel values " << std::endl;
typedef itk::ImageRegionIterator< ImageType > IteratorType;
typedef itk::ImageRegionConstIterator< ImageType > ConstIteratorType;
IteratorType itr( image, region );
itr.GoToBegin();
PixelType pixelValue = itk::NumericTraits< PixelType >::Zero;
chronometer.Start("Initializing");
while( !itr.IsAtEnd() )
{
itr.Set( pixelValue );
++pixelValue;
++itr;
}
chronometer.Stop("Initializing");
std::cout << "Trying to write the image to disk" << std::endl;
try
{
WriterType::Pointer writer = WriterType::New();
writer->SetInput(image);
writer->SetFileName(av[1]);
chronometer.Start("Write");
writer->Update();
chronometer.Stop("Write");
}
catch (itk::ExceptionObject &ex)
{
std::cout << ex << std::endl;
return EXIT_FAILURE;
}
std::cout << "Trying to read the image back from disk" << std::endl;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(av[1]);
try
{
chronometer.Start("Read");
reader->Update();
chronometer.Stop("Read");
}
catch (itk::ExceptionObject &ex)
{
std::cout << ex << std::endl;
return EXIT_FAILURE;
}
ImageType::ConstPointer readImage = reader->GetOutput();
ConstIteratorType ritr( readImage, region );
IteratorType oitr( image, region );
ritr.GoToBegin();
oitr.GoToBegin();
std::cout << "Comparing the pixel values.. :" << std::endl;
chronometer.Start("Compare");
while( !ritr.IsAtEnd() )
{
if( oitr.Get() != ritr.Get() )
{
std::cerr << "Pixel comparison failed at index = " << oitr.GetIndex() << std::endl;
return EXIT_FAILURE;
}
++oitr;
++ritr;
}
chronometer.Stop("Compare");
chronometer.Report( std::cout );
std::cout << std::endl;
std::cout << "Test PASSED !" << std::endl;
return EXIT_SUCCESS;
}
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