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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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.
*
*=========================================================================*/
/** \file
\brief Compare two images.
\verbinclude imagecompare.help
*/
#include "itkCommandLineArgumentParser.h"
#include "itkNumericTraits.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkExtractImageFilter.h"
#include "itksys/SystemTools.hxx"
#include "itkImageSource.h" // This should not be necessary after ITK patch is merged
#include "itkTestingComparisonImageFilter.h"
/**
* ******************* GetHelpString *******************
*/
std::string
GetHelpString( void )
{
std::stringstream ss;
ss << "Usage:" << std::endl
<< "elxImageCompare" << std::endl
<< " -test image filename to test against baseline\n"
<< " -base baseline image filename\n"
<< " [-t] intensity difference threshold, default 0\n"
<< " [-a] allowable tolerance (# voxels different), default 0";
return ss.str();
} // end GetHelpString()
// This comparison works on all image types by reading images in a 6D double images. If images > 6 dimensions
// must be compared, change this variable.
static const unsigned int ITK_TEST_DIMENSION_MAX = 4;
int
main( int argc, char ** argv )
{
itk::CommandLineArgumentParser::Pointer parser = itk::CommandLineArgumentParser::New();
parser->SetCommandLineArguments( argc, argv );
parser->SetProgramHelpText( GetHelpString() );
parser->MarkArgumentAsRequired( "-test", "The input filename." );
parser->MarkArgumentAsRequired( "-base", "The baseline image filename." );
itk::CommandLineArgumentParser::ReturnValue validateArguments = parser->CheckForRequiredArguments();
if( validateArguments == itk::CommandLineArgumentParser::FAILED )
{
return EXIT_FAILURE;
}
else if( validateArguments == itk::CommandLineArgumentParser::HELPREQUESTED )
{
return EXIT_SUCCESS;
}
std::string testImageFileName;
parser->GetCommandLineArgument( "-test", testImageFileName );
std::string baselineImageFileName;
parser->GetCommandLineArgument( "-base", baselineImageFileName );
double diffThreshold = 0.0;
parser->GetCommandLineArgument( "-t", diffThreshold );
unsigned long allowedTolerance = 0;
parser->GetCommandLineArgument( "-a", allowedTolerance );
// Read images
typedef itk::Image< double, ITK_TEST_DIMENSION_MAX > ImageType;
typedef itk::ImageFileReader< ImageType > ReaderType;
// Read the baseline file
ReaderType::Pointer baselineReader = ReaderType::New();
baselineReader->SetFileName( baselineImageFileName );
try
{
baselineReader->Update();
}
catch( itk::ExceptionObject & err )
{
std::cerr << "Error during reading baseline image: " << err << std::endl;
return EXIT_FAILURE;
}
// Read the file to test
ReaderType::Pointer testReader = ReaderType::New();
testReader->SetFileName( testImageFileName );
try
{
testReader->Update();
}
catch( itk::ExceptionObject & err )
{
std::cerr << "Error during reading test image: " << err << std::endl;
return EXIT_FAILURE;
}
// The sizes of the baseline and test image must match
ImageType::SizeType baselineSize;
baselineSize = baselineReader->GetOutput()->GetLargestPossibleRegion().GetSize();
ImageType::SizeType testSize;
testSize = testReader->GetOutput()->GetLargestPossibleRegion().GetSize();
if( baselineSize != testSize )
{
std::cerr << "The size of the Baseline image and Test image do not match!" << std::endl;
std::cerr << "Baseline image: " << baselineImageFileName
<< " has size " << baselineSize << std::endl;
std::cerr << "Test image: " << testImageFileName
<< " has size " << testSize << std::endl;
return EXIT_FAILURE;
}
// Now compare the two images
typedef itk::Testing::ComparisonImageFilter< ImageType, ImageType > ComparisonFilterType;
ComparisonFilterType::Pointer comparisonFilter = ComparisonFilterType::New();
comparisonFilter->SetTestInput( testReader->GetOutput() );
comparisonFilter->SetValidInput( baselineReader->GetOutput() );
comparisonFilter->SetDifferenceThreshold( diffThreshold );
try
{
comparisonFilter->Update();
}
catch( itk::ExceptionObject & err )
{
std::cerr << "Error during comparing image: " << err << std::endl;
return EXIT_FAILURE;
}
//itk::SizeValueType numberOfDifferentPixels = comparisonFilter->GetNumberOfPixelsWithDifferences(); // in ITK4
unsigned long numberOfDifferentPixels = comparisonFilter->GetNumberOfPixelsWithDifferences();
if( numberOfDifferentPixels > 0 )
{
std::cerr << "There are " << numberOfDifferentPixels
<< " pixels with difference larger than "
<< diffThreshold
<< ", while " << allowedTolerance << " are allowed!" << std::endl;
// Create name for diff image
std::string diffImageFileName
= itksys::SystemTools::GetFilenamePath( testImageFileName );
diffImageFileName += "/";
diffImageFileName
+= itksys::SystemTools::GetFilenameWithoutLastExtension( testImageFileName );
diffImageFileName += "_DIFF";
diffImageFileName += itksys::SystemTools::GetFilenameLastExtension( testImageFileName );
typedef itk::ImageFileWriter< ImageType > WriterType;
WriterType::Pointer writer = WriterType::New();
writer->SetFileName( diffImageFileName );
writer->SetInput( comparisonFilter->GetOutput() );
try
{
writer->Write();
}
catch( itk::ExceptionObject & err )
{
std::cerr << "Error during writing difference image: " << err << std::endl;
return EXIT_FAILURE;
}
if( numberOfDifferentPixels > allowedTolerance )
{
return EXIT_FAILURE;
}
} // end if discrepancies
return EXIT_SUCCESS;
} // end main
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