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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 "itkDisplacementFieldToBSplineImageFilter.h"
int itkDisplacementFieldToBSplineImageFilterTest( int, char * [] )
{
const unsigned int ImageDimension = 2;
typedef itk::Vector<float, ImageDimension> VectorType;
typedef itk::Image<VectorType, ImageDimension> DisplacementFieldType;
typedef itk::PointSet<VectorType, ImageDimension> PointSetType;
// Create a displacement field
DisplacementFieldType::PointType origin;
DisplacementFieldType::SpacingType spacing;
DisplacementFieldType::SizeType size;
DisplacementFieldType::DirectionType direction;
direction.SetIdentity();
origin.Fill( 0.0 );
spacing.Fill( 0.5 );
size.Fill( 100 );
VectorType ones( 1 );
DisplacementFieldType::Pointer field = DisplacementFieldType::New();
field->SetOrigin( origin );
field->SetSpacing( spacing );
field->SetRegions( size );
field->SetDirection( direction );
field->Allocate();
field->FillBuffer( ones );
typedef itk::DisplacementFieldToBSplineImageFilter
<DisplacementFieldType, PointSetType> BSplineFilterType;
typedef BSplineFilterType::RealImageType RealImageType;
RealImageType::Pointer confidenceImage = RealImageType::New();
confidenceImage->CopyInformation( field );
confidenceImage->SetRegions( size );
confidenceImage->Allocate();
confidenceImage->FillBuffer( 1.0 );
PointSetType::Pointer pointSet = PointSetType::New();
pointSet->Initialize();
VectorType ones_points( 1.0 );
// Assign some random points within the b-spline domain
PointSetType::PointType point1;
point1[0] = 23.75;
point1[1] = 5.125;
pointSet->SetPoint( 0, point1 );
pointSet->SetPointData( 0, ones_points );
PointSetType::PointType point2;
point2[0] = 1.75;
point2[1] = 45.125;
pointSet->SetPoint( 1, point2 );
pointSet->SetPointData( 1, ones_points );
PointSetType::PointType point3;
point3[0] = 45.75;
point3[1] = 2.125;
pointSet->SetPoint( 2, point3 );
pointSet->SetPointData( 2, ones_points );
BSplineFilterType::ArrayType numberOfControlPoints;
numberOfControlPoints.Fill( 4 );
BSplineFilterType::Pointer bspliner = BSplineFilterType::New();
bspliner->SetDisplacementField( field );
bspliner->SetConfidenceImage( confidenceImage );
bspliner->SetPointSet( pointSet );
bspliner->SetUseInputFieldToDefineTheBSplineDomain( true );
bspliner->SetNumberOfControlPoints( numberOfControlPoints );
bspliner->SetSplineOrder( 3 );
bspliner->SetNumberOfFittingLevels( 8 );
bspliner->EnforceStationaryBoundaryOff();
bspliner->EnforceStationaryBoundaryOn();
bspliner->SetEnforceStationaryBoundary( false );
bspliner->EstimateInverseOff();
bspliner->EstimateInverseOn();
bspliner->SetEstimateInverse( false );
bspliner->Update();
std::cout << "spline order: " << bspliner->GetSplineOrder() << std::endl;
std::cout << "number of control points: " << bspliner->GetNumberOfControlPoints() << std::endl;
std::cout << "number of fitting levels: " << bspliner->GetNumberOfFittingLevels() << std::endl;
std::cout << "enforce stationary boundary: " << bspliner->GetEnforceStationaryBoundary() << std::endl;
std::cout << "estimate inverse: " << bspliner->GetEstimateInverse() << std::endl;
try
{
bspliner->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Exception thrown " << std::endl;
std::cerr << excp << std::endl;
}
DisplacementFieldType::IndexType index;
index[0] = 50;
index[1] = 50;
VectorType v = bspliner->GetOutput()->GetPixel( index );
if( itk::Math::abs( v.GetNorm() - 1.414214 ) >= 0.01 )
{
std::cerr << "Failed to find the correct forward displacement vector." << std::endl;
return EXIT_FAILURE;
}
bspliner->SetNumberOfControlPoints( numberOfControlPoints );
bspliner->SetSplineOrder( 3 );
bspliner->SetNumberOfFittingLevels( 5 );
bspliner->EnforceStationaryBoundaryOff();
bspliner->EnforceStationaryBoundaryOn();
bspliner->SetEnforceStationaryBoundary( false );
bspliner->SetEstimateInverse( true );
bspliner->Update();
v = bspliner->GetOutput()->GetPixel( index );
if( itk::Math::abs( v.GetNorm() - 1.414214 ) >= 0.01 )
{
std::cerr << "Failed to find the correct inverse displacement vector." << std::endl;
return EXIT_FAILURE;
}
bspliner->Print( std::cout, 3 );
/** do a second run using only the point set. */
BSplineFilterType::Pointer bspliner2 = BSplineFilterType::New();
bspliner2->SetPointSet( pointSet );
bspliner2->SetUseInputFieldToDefineTheBSplineDomain( false );
bspliner2->SetBSplineDomainFromImage( field );
bspliner2->SetNumberOfControlPoints( numberOfControlPoints );
bspliner2->SetSplineOrder( 3 );
bspliner2->SetNumberOfFittingLevels( 8 );
bspliner2->EnforceStationaryBoundaryOff();
bspliner2->EnforceStationaryBoundaryOn();
bspliner2->SetEnforceStationaryBoundary( false );
bspliner2->EstimateInverseOff();
bspliner2->EstimateInverseOn();
bspliner2->SetEstimateInverse( false );
bspliner2->Update();
try
{
bspliner2->Update();
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Exception thrown " << std::endl;
std::cerr << excp << std::endl;
}
return EXIT_SUCCESS;
}
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