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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.
*
*=========================================================================*/
#ifndef itkAntiAliasBinaryImageFilter_hxx
#define itkAntiAliasBinaryImageFilter_hxx
#include "itkAntiAliasBinaryImageFilter.h"
#include "itkMinimumMaximumImageCalculator.h"
#include "itkMath.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
AntiAliasBinaryImageFilter< TInputImage, TOutputImage >
::AntiAliasBinaryImageFilter() :
m_UpperBinaryValue( NumericTraits< BinaryValueType >::OneValue() ),
m_LowerBinaryValue( NumericTraits< BinaryValueType >::ZeroValue() ),
m_InputImage( ITK_NULLPTR )
{
m_CurvatureFunction = CurvatureFunctionType::New();
this->SetDifferenceFunction(m_CurvatureFunction);
if ( TInputImage::ImageDimension == 2 )
{
this->SetNumberOfLayers(2);
}
else
{
if ( TInputImage::ImageDimension == 3 )
{
this->SetNumberOfLayers(3);
}
else
{
this->SetNumberOfLayers(TInputImage::ImageDimension);
}
}
this->SetMaximumRMSError(0.07);
this->SetNumberOfIterations(1000);
this->SetUseImageSpacing(false);
}
template< typename TInputImage, typename TOutputImage >
typename AntiAliasBinaryImageFilter< TInputImage, TOutputImage >::ValueType
AntiAliasBinaryImageFilter< TInputImage, TOutputImage >
::CalculateUpdateValue(const IndexType & idx, const TimeStepType & dt,
const ValueType & value, const ValueType & change)
{
// This method introduces the constraint on the flow of the surface.
const BinaryValueType binary_val = m_InputImage->GetPixel(idx);
const ValueType new_value = value + dt * change;
if ( Math::ExactlyEquals(binary_val, m_UpperBinaryValue) )
{
return ( std::max( new_value, this->GetValueZero() ) );
}
else
{
return ( std::min( new_value, this->GetValueZero() ) );
}
}
template< typename TInputImage, typename TOutputImage >
void
AntiAliasBinaryImageFilter< TInputImage, TOutputImage >
::GenerateData()
{
this->InterpolateSurfaceLocationOff(); // no need for interpolation here
if ( TInputImage::ImageDimension > 3 && this->GetNumberOfLayers() < 4 )
{
itkWarningMacro("Only 3 layers are being used in the solver."
<< " You should consider using at least as many layers as dimensions of your input."
<< " This value can be set by calling SetNumberOfLayers(n) on this filter.");
}
m_InputImage = this->GetInput();
// Find the minimum and maximum of the input image and use these values to
// set m_UpperBinaryValue, m_LowerBinaryValue, and m_IsoSurfaceValue in the
// parent class.
typename itk::MinimumMaximumImageCalculator< InputImageType >::Pointer
minmax = itk::MinimumMaximumImageCalculator< InputImageType >::New();
minmax->SetImage(m_InputImage);
minmax->ComputeMinimum();
minmax->ComputeMaximum();
m_UpperBinaryValue = minmax->GetMaximum();
m_LowerBinaryValue = minmax->GetMinimum();
ValueType min = static_cast< ValueType >( minmax->GetMinimum() );
ValueType max = static_cast< ValueType >( minmax->GetMaximum() );
// IsoSurface value is halfway between minimum and maximum. In a binary
// image, this places the zero level sets correctly no matter what the binary
// values may be.
this->SetIsoSurfaceValue( max - ( ( max - min ) / 2.0 ) );
// Start the solver
Superclass::GenerateData();
// Release the pointer
m_InputImage = ITK_NULLPTR;
}
template< typename TInputImage, typename TOutputImage >
void
AntiAliasBinaryImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "m_UpperBinaryValue = " << m_UpperBinaryValue << std::endl;
os << indent << "m_LowerBinaryValue = " << m_LowerBinaryValue << std::endl;
itkPrintSelfObjectMacro( InputImage );
}
} // end namespace itk
#endif
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