itkMorphSDTHelperImageFilter.h

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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 itkMorphSDTHelperImageFilter_h
#define itkMorphSDTHelperImageFilter_h

#include "itkTernaryFunctorImageFilter.h"
#include "vnl/vnl_math.h"

namespace itk
{
namespace Function
{
template< class TInput1, class TInput2 = TInput1, class TInput3 = TInput1, class TOutput = TInput1 >
class MorphSDTHelper
{
public:
  MorphSDTHelper() {}
  ~MorphSDTHelper() {}
  void SetVal(double i) { m_Val = i; }
  bool operator!=(const MorphSDTHelper &) const
  {
    return false;
  }

  bool operator==(const MorphSDTHelper & other) const
  {
    return !( *this != other );
  }

  inline TOutput operator()(const TInput1 & A, const TInput2 & B, const TInput3 & C)
  {
    // A should be the output of the erosion, B the dilation, C the mask
    if ( C > 0 )
      {
      // inside the mask
      return static_cast< TOutput >( vcl_sqrt( (double)A + m_Val ) );
      }
    else
      {
      // outside the mask
      return static_cast< TOutput >( -vcl_sqrt(m_Val - (double)B) );
      }
  }

private:
  double m_Val;
};
}

template< class TInputImage1, class TInputImage2 = TInputImage1, class TInputImage3 = TInputImage1,
          class TOutputImage = TInputImage1 >
class ITK_EXPORT MorphSDTHelperImageFilter:
  public
  TernaryFunctorImageFilter< TInputImage1, TInputImage2, TInputImage3, TOutputImage,
                             Function::MorphSDTHelper<
                               typename TInputImage1::PixelType,
                               typename TInputImage2::PixelType,
                               typename TInputImage3::PixelType,
                               typename TOutputImage::PixelType >   >
{
public:
  typedef MorphSDTHelperImageFilter Self;
  typedef TernaryFunctorImageFilter< TInputImage1, TInputImage2, TInputImage3, TOutputImage,
                                     Function::MorphSDTHelper<
                                       typename TInputImage1::PixelType,
                                       typename TInputImage2::PixelType,
                                       typename TInputImage3::PixelType,
                                       typename TOutputImage::PixelType >
                                     > Superclass;

  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(MorphSDTHelperImageFilter,
               TernaryFunctorImageFilter);

  void SetVal(double val)
  {
    this->GetFunctor().SetVal(val);
    this->Modified();
  }

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro( Input1ConvertibleToOutputCheck,
                   ( Concept::Convertible< typename TInputImage1::PixelType,
                                           typename TOutputImage::PixelType > ) );
  itkConceptMacro( Input2ConvertibleToOutputCheck,
                   ( Concept::Convertible< typename TInputImage2::PixelType,
                                           typename TOutputImage::PixelType > ) );
  itkConceptMacro( GreaterThanComparable,
                   ( Concept::GreaterThanComparable< typename TInputImage3::PixelType,
                                                     typename TInputImage3::PixelType > ) );

#endif
protected:
  MorphSDTHelperImageFilter() {}
  virtual ~MorphSDTHelperImageFilter() {}
private:
  MorphSDTHelperImageFilter(const Self &); //purposely not implemented
  void operator=(const Self &);            //purposely not implemented
};
} // end namespace itk

#endif