itkGradientMagnitudeRecursiveGaussianImageFilter.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 itkGradientMagnitudeRecursiveGaussianImageFilter_h
#define itkGradientMagnitudeRecursiveGaussianImageFilter_h

#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkPixelTraits.h"
#include "itkRecursiveGaussianImageFilter.h"
#include "itkSqrtImageFilter.h"
#include "itkBinaryFunctorImageFilter.h"

namespace itk
{
// NOTE that the typename macro has to be used here in lieu
// of "typename" because VC++ doesn't like the typename keyword
// on the defaults of template parameters
template< typename TInputImage,
          typename TOutputImage = TInputImage >
class GradientMagnitudeRecursiveGaussianImageFilter:
  public InPlaceImageFilter< TInputImage, TOutputImage >
{
public:
  typedef GradientMagnitudeRecursiveGaussianImageFilter   Self;
  typedef InPlaceImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

  typedef TInputImage                        InputImageType;
  typedef typename InputImageType::PixelType PixelType;

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef typename NumericTraits< PixelType >::RealType RealType;

  typedef float InternalRealType;
  typedef Image< InternalRealType,
                 itkGetStaticConstMacro(ImageDimension) >   RealImageType;

  typedef RecursiveGaussianImageFilter<
    RealImageType,
    RealImageType
    >    GaussianFilterType;

  typedef RecursiveGaussianImageFilter<
    InputImageType,
    RealImageType
    >    DerivativeFilterType;

  typedef SqrtImageFilter<
    RealImageType,
    TOutputImage
    >    SqrtFilterType;

  typedef typename GaussianFilterType::Pointer GaussianFilterPointer;

  typedef typename DerivativeFilterType::Pointer DerivativeFilterPointer;

  typedef typename SqrtFilterType::Pointer SqrtFilterPointer;

  typedef typename TOutputImage::Pointer OutputImagePointer;

  typedef TOutputImage                        OutputImageType;
  typedef typename OutputImageType::PixelType OutputPixelType;

  typedef Image< InternalRealType,
                 itkGetStaticConstMacro(ImageDimension) >      CumulativeImageType;
  typedef typename CumulativeImageType::Pointer CumulativeImagePointer;

  itkNewMacro(Self);

  itkTypeMacro(GradientMagnitudeRecursiveGaussianImageFilter,
               InPlaceImageFilter);

  void SetSigma(RealType sigma);
  RealType GetSigma();

  void SetNormalizeAcrossScale(bool normalizeInScaleSpace);
  itkGetConstMacro(NormalizeAcrossScale, bool);

  void SetNumberOfThreads(ThreadIdType nb) ITK_OVERRIDE;

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< PixelType > ) );
  // End concept checking
#endif

protected:
  GradientMagnitudeRecursiveGaussianImageFilter();
  virtual ~GradientMagnitudeRecursiveGaussianImageFilter() {}
  void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;

  void GenerateData(void) ITK_OVERRIDE;

  virtual void GenerateInputRequestedRegion() ITK_OVERRIDE;

  void EnlargeOutputRequestedRegion(DataObject *output) ITK_OVERRIDE;

private:
  GradientMagnitudeRecursiveGaussianImageFilter(const Self &); //purposely not
                                                               // implemented
  void operator=(const Self &);                                //purposely not

  // implemented

  class SqrSpacing
  {
  public:
    SqrSpacing():m_Spacing(0) {}
    ~SqrSpacing() {}
    bool operator!=(const SqrSpacing & other) const
    {
      return !( *this == other );
    }

    bool operator==(const SqrSpacing & other) const
    {
      return other.m_Spacing == m_Spacing;
    }

    inline InternalRealType operator()(const InternalRealType & a, const InternalRealType & b)
    {
      return a + vnl_math_sqr(b / m_Spacing);
    }

    double m_Spacing;
  };

  typedef BinaryFunctorImageFilter< RealImageType, RealImageType, RealImageType, SqrSpacing > SqrSpacingFilterType;
  typedef typename SqrSpacingFilterType::Pointer                                              SqrSpacingFilterPointer;

  GaussianFilterPointer   m_SmoothingFilters[ImageDimension - 1];
  DerivativeFilterPointer m_DerivativeFilter;
  SqrSpacingFilterPointer m_SqrSpacingFilter;
  SqrtFilterPointer       m_SqrtFilter;

  bool m_NormalizeAcrossScale;
};
} // end namespace itk

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

#endif