itkAreaOpeningImageFilter.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 itkAreaOpeningImageFilter_h
#define itkAreaOpeningImageFilter_h

#include "itkAttributeMorphologyBaseImageFilter.h"
#include <functional>

namespace itk
{
template< typename TInputImage, typename TOutputImage, typename TAttribute = typename TInputImage::SpacingType::ValueType >
class AreaOpeningImageFilter:
  public AttributeMorphologyBaseImageFilter< TInputImage, TOutputImage, TAttribute,
                                             std::greater< typename TInputImage::PixelType > >

{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(AreaOpeningImageFilter);

  using Self = AreaOpeningImageFilter;
  using Superclass = AttributeMorphologyBaseImageFilter< TInputImage, TOutputImage, TAttribute,
                                              std::greater< typename TInputImage::PixelType > >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  using OutputPixelType = typename TOutputImage::PixelType;
  using OutputInternalPixelType = typename TOutputImage::InternalPixelType;
  using InputPixelType = typename TInputImage::PixelType;
  using InputInternalPixelType = typename TInputImage::InternalPixelType;
  using IndexType = typename TInputImage::IndexType;
  using OffsetType = typename TInputImage::OffsetType;
  using SizeType = typename TInputImage::SizeType;
  using AttributeType = TAttribute;

  static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;

  itkNewMacro(Self);

  itkTypeMacro(AreaOpeningImageFilter,
               AttributeMorphologyBaseImageFilter);

  itkSetMacro(UseImageSpacing, bool);
  itkGetConstReferenceMacro(UseImageSpacing, bool);
  itkBooleanMacro(UseImageSpacing);

protected:
  AreaOpeningImageFilter()
  {
    m_UseImageSpacing = true;
  }

  ~AreaOpeningImageFilter() override {}

  void GenerateData() override
  {
    this->m_AttributeValuePerPixel = 1;
    if ( m_UseImageSpacing )
      {
      // compute pixel size
      double psize = 1.0;
      for ( unsigned i = 0; i < ImageDimension; i++ )
        {
        psize *= this->GetInput()->GetSpacing()[i];
        }
      this->m_AttributeValuePerPixel = static_cast< AttributeType >( psize );
      // std::cout << "m_AttributeValuePerPixel: " <<
      // this->m_AttributeValuePerPixel << std::endl;
      // and call superclass implementation of GenerateData()
      }
    Superclass::GenerateData();
  }

  void PrintSelf(std::ostream & os, Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
    os << indent << "UseImageSpacing: "  << m_UseImageSpacing << std::endl;
  }

private:

  bool m_UseImageSpacing;
};
} // namespace itk
#endif