mitkitkMaskImageFilter.h

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/*============================================================================
 
The Medical Imaging Interaction Toolkit (MITK)
 
Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.
 
Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.
 
============================================================================*/
 
#ifndef mitkitkMaskImageFilter_h
#define mitkitkMaskImageFilter_h
 
// This file is based on ITK's itkMaskImageFilter.h
 
#include <itkBinaryFunctorImageFilter.h>
#include <itkNumericTraits.h>
#include <itkVariableLengthVector.h>
#include <MitkImageStatisticsExports.h>
 
namespace itk
{
namespace Functor
{
template< typename TInput, typename TMask, typename TOutput = TInput >
class MaskInput2
{
public:
  typedef typename NumericTraits< TInput >::AccumulateType AccumulatorType;
 
  MaskInput2()
  {
    m_MaskingValue = NumericTraits< TMask >::ZeroValue();
    InitializeOutsideValue( static_cast<TOutput*>( nullptr ) );
  }
  ~MaskInput2() {}
  bool operator!=(const MaskInput2 &) const
  {
    return false;
  }
 
  bool operator==(const MaskInput2 & other) const
  {
    return !( *this != other );
  }
 
  inline TOutput operator()(const TInput & A, const TMask & B) const
  {
    if ( B == m_MaskingValue )
      {
      return static_cast< TOutput >( A );
      }
    else
      {
      return m_OutsideValue;
      }
  }
 
  void SetOutsideValue(const TOutput & outsideValue)
  {
    m_OutsideValue = outsideValue;
  }
 
  const TOutput & GetOutsideValue() const
  {
    return m_OutsideValue;
  }
 
  void SetMaskingValue(const TMask & maskingValue)
  {
    m_MaskingValue = maskingValue;
  }
  const TMask & GetMaskingValue() const
  {
    return m_MaskingValue;
  }
 
private:
 
  template < typename TPixelType >
  void InitializeOutsideValue( TPixelType * )
  {
    this->m_OutsideValue = NumericTraits< TPixelType >::ZeroValue();
  }
 
  template < typename TValue >
  void InitializeOutsideValue( VariableLengthVector<TValue> * )
  {
    // set the outside value to be of zero length
    this->m_OutsideValue = VariableLengthVector< TValue >(0);
  }
 
  TOutput m_OutsideValue;
  TMask   m_MaskingValue;
};
}
template< typename TInputImage, typename TMaskImage, typename TOutputImage = TInputImage >
class MITKIMAGESTATISTICS_EXPORT MaskImageFilter2:
  public
  BinaryFunctorImageFilter< TInputImage, TMaskImage, TOutputImage,
                            Functor::MaskInput2<
                              typename TInputImage::PixelType,
                              typename TMaskImage::PixelType,
                              typename TOutputImage::PixelType >   >
 
{
public:
  typedef MaskImageFilter2 Self;
  typedef BinaryFunctorImageFilter< TInputImage, TMaskImage, TOutputImage,
                                    Functor::MaskInput2<
                                      typename TInputImage::PixelType,
                                      typename TMaskImage::PixelType,
                                      typename TOutputImage::PixelType >
                                    >                                 Superclass;
 
  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;
 
  itkNewMacro(Self);
 
  itkTypeMacro(MaskImageFilter2,
               BinaryFunctorImageFilter);
 
  typedef TMaskImage MaskImageType;
 
  void SetMaskImage(const MaskImageType *maskImage)
  {
    // Process object is not const-correct so the const casting is required.
    this->SetNthInput( 1, const_cast< MaskImageType * >( maskImage ) );
  }
  const MaskImageType * GetMaskImage()
  {
    return static_cast<const MaskImageType*>(this->ProcessObject::GetInput(1));
  }
 
  void SetOutsideValue(const typename TOutputImage::PixelType & outsideValue)
  {
    if ( this->GetOutsideValue() != outsideValue )
      {
      this->Modified();
      this->GetFunctor().SetOutsideValue(outsideValue);
      }
  }
 
  const typename TOutputImage::PixelType & GetOutsideValue() const
  {
    return this->GetFunctor().GetOutsideValue();
  }
 
  void SetMaskingValue(const typename TMaskImage::PixelType & maskingValue)
  {
    if ( this->GetMaskingValue() != maskingValue )
      {
      this->Modified();
      this->GetFunctor().SetMaskingValue(maskingValue);
      }
  }
 
  const typename TMaskImage::PixelType & GetMaskingValue() const
  {
    return this->GetFunctor().GetMaskingValue();
  }
 
  void BeforeThreadedGenerateData() override
  {
    typedef typename TOutputImage::PixelType PixelType;
    this->CheckOutsideValue( static_cast<PixelType*>(nullptr) );
  }
 
#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( MaskEqualityComparableCheck,
                   ( Concept::EqualityComparable< typename TMaskImage::PixelType > ) );
  itkConceptMacro( InputConvertibleToOutputCheck,
                   ( Concept::Convertible< typename TInputImage::PixelType,
                                           typename TOutputImage::PixelType > ) );
  // End concept checking
#endif
 
protected:
  MaskImageFilter2() {}
  ~MaskImageFilter2() override {}
 
  void PrintSelf(std::ostream & os, Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
    os << indent << "OutsideValue: "  << this->GetOutsideValue() << std::endl;
  }
 
private:
  MaskImageFilter2(const Self &); //purposely not implemented
  void operator=(const Self &);  //purposely not implemented
 
  template < typename TPixelType >
  void CheckOutsideValue( const TPixelType * ) {}
 
  template < typename TValue >
  void CheckOutsideValue( const VariableLengthVector< TValue > * )
  {
    // Check to see if the outside value contains only zeros. If so,
    // resize it to have the same number of zeros as the output
    // image. Otherwise, check that the number of components in the
    // outside value is the same as the number of components in the
    // output image. If not, throw an exception.
    VariableLengthVector< TValue > currentValue =
      this->GetFunctor().GetOutsideValue();
    VariableLengthVector< TValue > zeroVector( currentValue.GetSize() );
    zeroVector.Fill( NumericTraits< TValue >::ZeroValue() );
 
    if ( currentValue == zeroVector )
      {
      zeroVector.SetSize( this->GetOutput()->GetVectorLength() );
      zeroVector.Fill( NumericTraits< TValue >::ZeroValue() );
      this->GetFunctor().SetOutsideValue( zeroVector );
      }
    else if ( this->GetFunctor().GetOutsideValue().GetSize() !=
              this->GetOutput()->GetVectorLength() )
      {
      itkExceptionMacro(
        << "Number of components in OutsideValue: "
        <<  this->GetFunctor().GetOutsideValue().GetSize()
        << " is not the same as the "
        << "number of components in the image: "
        << this->GetOutput()->GetVectorLength());
      }
  }
 
};
} // end namespace itk
 
#endif