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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 Compute the overlap of two images.
\verbinclude computeoverlap.help
*/
#include "itkCommandLineArgumentParser.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkAndImageFilter.h"
#include "itkImageRegionConstIterator.h"
/**
* ******************* GetHelpString *******************
*/
std::string GetHelpString( void )
{
std::stringstream ss;
ss << "Usage:\n"
<< "elxComputeOverlap\n"
<< "This program computes the overlap of two images.\n"
<< "The results is computed as:\n"
<< " 2 * L1( im1 AND im2 )\n"
<< " ------------------------\n"
<< " L1( im1 ) + L1( im2 )\n\n"
<< " -in inputFilename1 inputFilename2";// << std::endl
// << "Supported: 2D, 3D, (unsigned) char, (unsigned) short";
return ss.str();
} // end GetHelpString()
//-------------------------------------------------------------------------------------
int main( int argc, char ** argv )
{
/** Create a command line argument parser. */
itk::CommandLineArgumentParser::Pointer parser = itk::CommandLineArgumentParser::New();
parser->SetCommandLineArguments( argc, argv );
parser->SetProgramHelpText( GetHelpString() );
/** Get arguments. */
std::vector<std::string> inputFileNames;
bool retin = parser->GetCommandLineArgument( "-in", inputFileNames );
parser->MarkArgumentAsRequired( "-in", "Two input filenames." );
itk::CommandLineArgumentParser::ReturnValue validateArguments = parser->CheckForRequiredArguments();
if( validateArguments == itk::CommandLineArgumentParser::FAILED )
{
return EXIT_FAILURE;
}
else if( validateArguments == itk::CommandLineArgumentParser::HELPREQUESTED )
{
return EXIT_SUCCESS;
}
//double tolerance = 1e-3;
//parser->GetCommandLineArgument( "-tol", tolerance );
/** Checks. */
if( !retin || inputFileNames.size() != 2 )
{
std::cerr << "ERROR: You should specify two input file names with \"-in\"." << std::endl;
return EXIT_FAILURE;
}
/** Hard-coded image dimension and pixel type. */
const unsigned int Dimension = 3;
typedef unsigned char PixelType;
/** Typedefs. */
typedef itk::Image< PixelType, Dimension > ImageType;
typedef itk::ImageFileReader< ImageType > ImageReaderType;
typedef ImageReaderType::Pointer ImageReaderPointer;
typedef itk::AndImageFilter<
ImageType, ImageType, ImageType > AndFilterType;
typedef AndFilterType::Pointer AndFilterPointer;
typedef itk::ImageRegionConstIterator< ImageType > IteratorType;
/** Create readers and an AND filter. */
ImageReaderPointer reader1 = ImageReaderType::New();
reader1->SetFileName( inputFileNames[ 0 ].c_str() );
ImageReaderPointer reader2 = ImageReaderType::New();
reader2->SetFileName( inputFileNames[ 1 ].c_str() );
AndFilterPointer ANDFilter = AndFilterType::New();
ANDFilter->SetInput1( reader2->GetOutput() );
ANDFilter->SetInput2( reader1->GetOutput() );
//finalANDFilter->SetCoordinateTolerance( tolerance );
//finalANDFilter->SetDirectionTolerance( tolerance );
/** Do the AND operation. */
try
{
ANDFilter->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << excp << std::endl;
return EXIT_FAILURE;
}
/** Now calculate the L1-norms. */
/** Create iterators. */
IteratorType iteratorA( ANDFilter->GetInput( 1 ),
ANDFilter->GetInput( 1 )->GetLargestPossibleRegion() );
IteratorType iteratorB( ANDFilter->GetInput( 0 ),
ANDFilter->GetInput( 0 )->GetLargestPossibleRegion() );
IteratorType iteratorC( ANDFilter->GetOutput(),
ANDFilter->GetOutput()->GetLargestPossibleRegion() );
/** Determine size of first object. */
long long sumA = 0;
for( iteratorA.GoToBegin(); !iteratorA.IsAtEnd(); ++iteratorA )
{
if( iteratorA.Value() )
{
++sumA;
}
}
//std::cout << "Size of first object: " << sumA << std::endl;
/** Determine size of second object. */
long long sumB = 0;
for( iteratorB.GoToBegin(); !iteratorB.IsAtEnd(); ++iteratorB )
{
if( iteratorB.Value() )
{
++sumB;
}
}
//std::cout << "Size of second object: " << sumB << std::endl;
/** Determine size of cross-section. */
long long sumC = 0;
for( iteratorC.GoToBegin(); !iteratorC.IsAtEnd(); ++iteratorC )
{
if( iteratorC.Value() )
{
++sumC;
}
}
//std::cout << "Size of cross-section of both objects: " << sumC << std::endl;
/** Calculate the overlap. */
double overlap;
if( ( sumA + sumB ) == 0 )
{
overlap = 0;
}
else
{
overlap = static_cast<double>( 2 * sumC ) / static_cast<double>( sumA + sumB );
}
/** Format the output and show overlap. */
std::cout << std::fixed << std::showpoint;
std::cout << "Overlap: " << overlap << std::endl;
/** End program. */
return EXIT_SUCCESS;
} // end main
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