itkHessianRecursiveGaussianImageFilter.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
 *
 *         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 itkHessianRecursiveGaussianImageFilter_h
#define itkHessianRecursiveGaussianImageFilter_h
 
#include "itkRecursiveGaussianImageFilter.h"
#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkSymmetricSecondRankTensor.h"
#include "itkPixelTraits.h"
 
namespace itk
{
template <typename TInputImage,
          typename TOutputImage =
            Image<SymmetricSecondRankTensor<typename NumericTraits<typename TInputImage::PixelType>::RealType,
                                            TInputImage::ImageDimension>,
                  TInputImage::ImageDimension>>
class ITK_TEMPLATE_EXPORT HessianRecursiveGaussianImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(HessianRecursiveGaussianImageFilter);
 
  using Self = HessianRecursiveGaussianImageFilter;
  using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  using InputImageType = TInputImage;
  using PixelType = typename TInputImage::PixelType;
  using RealType = typename NumericTraits<PixelType>::RealType;
 
  static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
 
  static constexpr unsigned int NumberOfSmoothingFilters =
    (TInputImage::ImageDimension > 2) ? (TInputImage::ImageDimension - 2) : (0);
 
  using InternalRealType = float;
  using RealImageType = Image<InternalRealType, TInputImage::ImageDimension>;
 
  using OutputImageAdaptorType = NthElementImageAdaptor<TOutputImage, InternalRealType>;
 
  using OutputImageAdaptorPointer = typename OutputImageAdaptorType::Pointer;
 
  using GaussianFilterType = RecursiveGaussianImageFilter<RealImageType, RealImageType>;
 
  using DerivativeFilterAType = RecursiveGaussianImageFilter<InputImageType, RealImageType>;
 
  using DerivativeFilterBType = RecursiveGaussianImageFilter<RealImageType, RealImageType>;
 
  using GaussianFilterPointer = typename GaussianFilterType::Pointer;
  using GaussianFiltersArray = std::vector<GaussianFilterPointer>;
 
  using DerivativeFilterAPointer = typename DerivativeFilterAType::Pointer;
  using DerivativeFilterBPointer = typename DerivativeFilterBType::Pointer;
 
  using OutputImagePointer = typename TOutputImage::Pointer;
 
  using OutputImageType = TOutputImage;
  using OutputPixelType = typename OutputImageType::PixelType;
  using OutputComponentType = typename PixelTraits<OutputPixelType>::ValueType;
 
  itkTypeMacro(HessianRecursiveGaussianImageFilter, ImageToImageFilter);
 
  itkNewMacro(Self);
 
  void
  SetSigma(RealType sigma);
  RealType
  GetSigma() const;
 
  void
  SetNormalizeAcrossScale(bool normalize);
  itkGetConstMacro(NormalizeAcrossScale, bool);
 
  void
  GenerateInputRequestedRegion() override;
 
#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<PixelType>));
  itkConceptMacro(OutputHasPixelTraitsCheck, (Concept::HasPixelTraits<OutputPixelType>));
  // End concept checking
#endif
 
protected:
  HessianRecursiveGaussianImageFilter();
  ~HessianRecursiveGaussianImageFilter() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  GenerateData() override;
 
  // Override since the filter produces the entire dataset
  void
  EnlargeOutputRequestedRegion(DataObject * output) override;
 
private:
  GaussianFiltersArray      m_SmoothingFilters;
  DerivativeFilterAPointer  m_DerivativeFilterA;
  DerivativeFilterBPointer  m_DerivativeFilterB;
  OutputImageAdaptorPointer m_ImageAdaptor;
 
  bool m_NormalizeAcrossScale;
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkHessianRecursiveGaussianImageFilter.hxx"
#endif
 
#endif