itkOtsuMultipleThresholdsImageFilter.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 itkOtsuMultipleThresholdsImageFilter_h
#define itkOtsuMultipleThresholdsImageFilter_h
 
#include "itkImageToImageFilter.h"
#include "itkFixedArray.h"
#include "itkOtsuMultipleThresholdsCalculator.h"
#include "itkScalarImageToHistogramGenerator.h"
 
namespace itk
{
 
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT OtsuMultipleThresholdsImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(OtsuMultipleThresholdsImageFilter);

  using Self = OtsuMultipleThresholdsImageFilter;
  using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(OtsuMultipleThresholdsImageFilter);

  using InputPixelType = typename TInputImage::PixelType;
  using OutputPixelType = typename TOutputImage::PixelType;

  using InputImagePointer = typename TInputImage::Pointer;
  using OutputImagePointer = typename TOutputImage::Pointer;
 
  using InputSizeType = typename TInputImage::SizeType;
  using InputIndexType = typename TInputImage::IndexType;
  using InputImageRegionType = typename TInputImage::RegionType;
  using OutputSizeType = typename TOutputImage::SizeType;
  using OutputIndexType = typename TOutputImage::IndexType;
  using OutputImageRegionType = typename TOutputImage::RegionType;

  using HistogramGeneratorType = itk::Statistics::ScalarImageToHistogramGenerator<TInputImage>;
  using HistogramType = typename HistogramGeneratorType::HistogramType;
  using OtsuCalculatorType = OtsuMultipleThresholdsCalculator<HistogramType>;
  using ThresholdVectorType = typename OtsuCalculatorType::OutputType;

  static constexpr unsigned int InputImageDimension = TInputImage::ImageDimension;
  static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;

  itkSetClampMacro(NumberOfHistogramBins, SizeValueType, 1, NumericTraits<SizeValueType>::max());
  itkGetConstMacro(NumberOfHistogramBins, SizeValueType);

  itkSetClampMacro(NumberOfThresholds, SizeValueType, 1, NumericTraits<SizeValueType>::max());
  itkGetConstMacro(NumberOfThresholds, SizeValueType);

  itkSetClampMacro(LabelOffset, OutputPixelType, OutputPixelType{}, NumericTraits<OutputPixelType>::max());
  itkGetConstMacro(LabelOffset, OutputPixelType);

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

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

  const ThresholdVectorType &
  GetThresholds() const
  {
    return m_Thresholds;
  }
 
  itkConceptMacro(OutputComparableCheck, (Concept::Comparable<OutputPixelType>));
  itkConceptMacro(OutputOStreamWritableCheck, (Concept::OStreamWritable<OutputPixelType>));
 
protected:
  OtsuMultipleThresholdsImageFilter();
  ~OtsuMultipleThresholdsImageFilter() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  GenerateInputRequestedRegion() override;
 
  void
  GenerateData() override;
 
private:
  SizeValueType       m_NumberOfHistogramBins{ 128 };
  SizeValueType       m_NumberOfThresholds{ 1 };
  OutputPixelType     m_LabelOffset{};
  ThresholdVectorType m_Thresholds{};
  bool                m_ValleyEmphasis{ false };
  bool                m_ReturnBinMidpoint{ false };
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkOtsuMultipleThresholdsImageFilter.hxx"
#endif
 
#endif