itkAreaOpeningImageFilter.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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_MOVE(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);

  itkOverrideGetNameOfClassMacro(AreaOpeningImageFilter);

  itkSetMacro(UseImageSpacing, bool);
  itkGetConstReferenceMacro(UseImageSpacing, bool);
  itkBooleanMacro(UseImageSpacing);
 
protected:
  AreaOpeningImageFilter() { m_UseImageSpacing = true; }
 
  ~AreaOpeningImageFilter() override = default;
 
  void
  GenerateData() override
  {
    this->m_AttributeValuePerPixel = 1;
    if (m_UseImageSpacing)
    {
      const auto & spacing = this->GetInput()->GetSpacing();
 
      // compute pixel size
      double psize = 1.0;
      for (unsigned int i = 0; i < ImageDimension; ++i)
      {
        psize *= spacing[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);
    itkPrintSelfBooleanMacro(UseImageSpacing);
  }
 
private:
  bool m_UseImageSpacing{};
};
} // namespace itk
#endif