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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 "itkBSplineControlPointImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
template<unsigned int ImageDimension>
int BSpline( int argc, char *argv[] )
{
typedef float RealType;
typedef itk::Vector<RealType, 1> ScalarPixelType;
typedef itk::Image<ScalarPixelType, ImageDimension> ScalarFieldType;
typedef itk::ImageFileReader<ScalarFieldType> ReaderType;
typename ReaderType::Pointer reader = ReaderType::New();
if( argc > 2 )
{
reader->SetFileName( argv[2] );
reader->Update();
}
else
{
std::cerr << "No input image specified." << std::endl;
return EXIT_FAILURE;
}
/*
* Reconstruction of the scalar field from the control points.
*/
typename ScalarFieldType::PointType origin;
origin.Fill( 0 );
typename ScalarFieldType::SizeType size;
size.Fill( 100 );
typename ScalarFieldType::SpacingType spacing;
spacing.Fill( 1.0 );
typedef itk::BSplineControlPointImageFilter
<ScalarFieldType, ScalarFieldType> BSplinerType;
typename BSplinerType::Pointer bspliner = BSplinerType::New();
bspliner->SetInput( reader->GetOutput() );
bspliner->SetSplineOrder( 3 );
bspliner->SetSize( size );
bspliner->SetOrigin( origin );
bspliner->SetSpacing( spacing );
bspliner->SetDirection( reader->GetOutput()->GetDirection() );
try
{
bspliner->Update();
}
catch( itk::ExceptionObject &excep )
{
std::cerr << "Exception caught !" << std::endl;
std::cerr << excep << std::endl;
return EXIT_FAILURE;
}
typedef itk::ImageFileWriter<ScalarFieldType> WriterType;
typename WriterType::Pointer writer = WriterType::New();
writer->SetFileName( argv[3] );
writer->SetInput( bspliner->GetOutput() );
writer->Update();
/*
* Test out additional functionality by refining the control point lattice
* and seeing if the output is the same. In this example we double the
* resolution twice as the refinement is doubled at every level.
*/
typename BSplinerType::ArrayType numberOfRefinementLevels;
numberOfRefinementLevels.Fill( 3 );
typename BSplinerType::ControlPointLatticeType::Pointer
refinedControlPointLattice =
bspliner->RefineControlPointLattice( numberOfRefinementLevels );
typename BSplinerType::Pointer bspliner2 = BSplinerType::New();
bspliner2->SetInput( refinedControlPointLattice );
bspliner2->SetSplineOrder( 3 );
bspliner2->SetSize( size );
bspliner2->SetOrigin( origin );
bspliner2->SetSpacing( spacing );
bspliner2->SetDirection( reader->GetOutput()->GetDirection() );
try
{
bspliner2->Update();
}
catch( itk::ExceptionObject &excep )
{
std::cerr << "Exception caught !" << std::endl;
std::cerr << excep << std::endl;
return EXIT_FAILURE;
}
typename WriterType::Pointer writer2 = WriterType::New();
writer2->SetFileName( argv[4] );
writer2->SetInput( bspliner2->GetOutput() );
writer2->Update();
return EXIT_SUCCESS;
}
int itkBSplineControlPointImageFilterTest( int argc, char *argv[] )
{
if ( argc < 5 )
{
std::cerr << "Usage: " << argv[0] << " imageDimension inputControlPointImage"
<< " outputSampledBSplineObject outputSampledBSplineObjectRefined"
<< std::endl;
exit( EXIT_FAILURE );
}
int successOrFailure = EXIT_FAILURE;
switch( atoi( argv[1] ) )
{
case 2:
successOrFailure = BSpline<2>( argc, argv );
break;
case 3:
successOrFailure = BSpline<3>( argc, argv );
break;
default:
std::cerr << "Unsupported dimension" << std::endl;
exit( EXIT_FAILURE );
}
return successOrFailure;
}
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