itkHistogramMatchingImageFilter.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 itkHistogramMatchingImageFilter_h
#define itkHistogramMatchingImageFilter_h

#include "itkImageToImageFilter.h"
#include "itkHistogram.h"
#include "vnl/vnl_matrix.h"

namespace itk
{
/* THistogramMeasurement -- The precision level for which to do
  HistogramMeasurmenets */
template< typename TInputImage, typename TOutputImage, typename THistogramMeasurement = typename TInputImage::PixelType >
class ITK_TEMPLATE_EXPORT HistogramMatchingImageFilter:
  public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(HistogramMatchingImageFilter);

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

  itkNewMacro(Self);

  itkTypeMacro(HistogramMatchingImageFilter, ImageToImageFilter);

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

  using OutputImageRegionType = typename TOutputImage::RegionType;

  using InputImageType = typename Superclass::InputImageType;
  using InputImagePointer = typename Superclass::InputImagePointer;
  using InputImageConstPointer = typename Superclass::InputImageConstPointer;
  using OutputImageType = typename Superclass::OutputImageType;
  using OutputImagePointer = typename Superclass::OutputImagePointer;

  using InputPixelType = typename InputImageType::PixelType;
  using OutputPixelType = typename OutputImageType::PixelType;

  using HistogramType = Statistics::Histogram< THistogramMeasurement >;
  using HistogramPointer = typename HistogramType::Pointer;

  void SetSourceImage(const InputImageType *source)
  { this->SetInput(source); }
  const InputImageType * GetSourceImage()
  { return this->GetInput(); }

  void SetReferenceImage(const InputImageType *reference);

  const InputImageType * GetReferenceImage();

  itkSetMacro(NumberOfHistogramLevels, SizeValueType);
  itkGetConstMacro(NumberOfHistogramLevels, SizeValueType);

  itkSetMacro(NumberOfMatchPoints, SizeValueType);
  itkGetConstMacro(NumberOfMatchPoints, SizeValueType);

  itkSetMacro(ThresholdAtMeanIntensity, bool);
  itkGetConstMacro(ThresholdAtMeanIntensity, bool);
  itkBooleanMacro(ThresholdAtMeanIntensity);

  void GenerateInputRequestedRegion() override;

  itkGetModifiableObjectMacro(SourceHistogram, HistogramType);
  itkGetModifiableObjectMacro(ReferenceHistogram, HistogramType);
  itkGetModifiableObjectMacro(OutputHistogram, HistogramType);

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( IntConvertibleToInputCheck,
                   ( Concept::Convertible< int, InputPixelType > ) );
  itkConceptMacro( SameDimensionCheck,
                   ( Concept::SameDimension< ImageDimension, OutputImageDimension > ) );
  itkConceptMacro( DoubleConvertibleToInputCheck,
                   ( Concept::Convertible< double, InputPixelType > ) );
  itkConceptMacro( DoubleConvertibleToOutputCheck,
                   ( Concept::Convertible< double, OutputPixelType > ) );
  itkConceptMacro( InputConvertibleToDoubleCheck,
                   ( Concept::Convertible< InputPixelType, double > ) );
  itkConceptMacro( OutputConvertibleToDoubleCheck,
                   ( Concept::Convertible< OutputPixelType, double > ) );
  itkConceptMacro( SameTypeCheck,
                   ( Concept::SameType< InputPixelType, OutputPixelType > ) );
  // End concept checking
#endif

protected:
  HistogramMatchingImageFilter();
  ~HistogramMatchingImageFilter() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override;

  void BeforeThreadedGenerateData() override;

  void AfterThreadedGenerateData() override;

  void DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;


  void VerifyInputInformation() ITKv5_CONST override {}

  void ComputeMinMaxMean(const InputImageType *image,
                         THistogramMeasurement & minValue,
                         THistogramMeasurement & maxValue,
                         THistogramMeasurement & meanValue);

  void ConstructHistogram(const InputImageType *image,
                          HistogramType *histogram, const THistogramMeasurement minValue,
                          const THistogramMeasurement maxValue);

private:
  SizeValueType m_NumberOfHistogramLevels{256};
  SizeValueType m_NumberOfMatchPoints{1};
  bool          m_ThresholdAtMeanIntensity{true};

  InputPixelType  m_SourceIntensityThreshold;
  InputPixelType  m_ReferenceIntensityThreshold;
  OutputPixelType m_OutputIntensityThreshold;

  THistogramMeasurement m_SourceMinValue;
  THistogramMeasurement m_SourceMaxValue;
  THistogramMeasurement m_SourceMeanValue;
  THistogramMeasurement m_ReferenceMinValue;
  THistogramMeasurement m_ReferenceMaxValue;
  THistogramMeasurement m_ReferenceMeanValue;
  THistogramMeasurement m_OutputMinValue;
  THistogramMeasurement m_OutputMaxValue;
  THistogramMeasurement m_OutputMeanValue;

  HistogramPointer m_SourceHistogram;
  HistogramPointer m_ReferenceHistogram;
  HistogramPointer m_OutputHistogram;

  using TableType = vnl_matrix< double >;
  TableType m_QuantileTable;

  using GradientArrayType = vnl_vector< double >;
  GradientArrayType m_Gradients;
  double            m_LowerGradient{0.0};
  double            m_UpperGradient{0.0};
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkHistogramMatchingImageFilter.hxx"
#endif

#endif