itkHessianRecursiveGaussianImageFilter.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 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_ASSIGN(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 normalizeInScaleSpace);
  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