itkGradientRecursiveGaussianImageFilter.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 __itkGradientRecursiveGaussianImageFilter_h
#define __itkGradientRecursiveGaussianImageFilter_h

#include "itkRecursiveGaussianImageFilter.h"
#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkCovariantVector.h"
#include "itkDefaultConvertPixelTraits.h"
#include "itkProgressAccumulator.h"
#include "itkImageRegionIterator.h"
#include "itkVectorImage.h"
#include <vector>

namespace itk
{
template< typename TInputImage,
          typename TOutputImage = Image< CovariantVector<
                                           typename NumericTraits< typename TInputImage::PixelType >::RealType,
                                           TInputImage::ImageDimension >,
                                         TInputImage::ImageDimension > >
class ITK_EXPORT GradientRecursiveGaussianImageFilter:
  public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
  typedef GradientRecursiveGaussianImageFilter            Self;
  typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

  typedef TInputImage                                           InputImageType;
  typedef typename TInputImage::PixelType                       PixelType;
  typedef typename NumericTraits< PixelType >::RealType         RealType;
  typedef typename NumericTraits< PixelType >::ScalarRealType   ScalarRealType;

  typedef typename NumericTraits< RealType >::FloatType         InternalRealType;
  typedef typename NumericTraits< InternalRealType >::ValueType InternalScalarRealType;

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

  typedef CovariantVector<ScalarRealType, ImageDimension > GradientVectorType;

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


  typedef NthElementImageAdaptor< TOutputImage,
                                  InternalScalarRealType >  OutputImageAdaptorType;

  typedef typename OutputImageAdaptorType::Pointer OutputImageAdaptorPointer;

  typedef RecursiveGaussianImageFilter<
    RealImageType,
    RealImageType
    >    GaussianFilterType;

  typedef RecursiveGaussianImageFilter<
    InputImageType,
    RealImageType
    >    DerivativeFilterType;

  typedef typename GaussianFilterType::Pointer GaussianFilterPointer;

  typedef typename DerivativeFilterType::Pointer DerivativeFilterPointer;

  typedef typename TOutputImage::Pointer OutputImagePointer;

  typedef TOutputImage                                         OutputImageType;
  typedef typename          OutputImageType::PixelType         OutputPixelType;
  typedef typename NumericTraits< OutputPixelType >::ValueType OutputComponentType;
  typedef CovariantVector< OutputComponentType, ImageDimension >
    CovariantVectorType;

  itkNewMacro(Self);

  itkTypeMacro(GradientRecursiveGaussianImageFilter,
               ImageToImageFilter);

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

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

  virtual void GenerateInputRequestedRegion()
  throw( InvalidRequestedRegionError );

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

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro( InputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< PixelType > ) );

#endif

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

  void GenerateData(void);

  // Override since the filter produces the entire dataset
  void EnlargeOutputRequestedRegion(DataObject *output);

  void GenerateOutputInformation();

private:

  template <class TValueType>
  void TransformOutputPixel( ImageRegionIterator< VectorImage<TValueType, ImageDimension> > &it )
  {
    // To transform Variable length vector we need to convert to and
    // fro the CovariantVectorType
    const CovariantVectorType gradient( it.Get().GetDataPointer() );
    CovariantVectorType physicalGradient;
    it.GetImage()->TransformLocalVectorToPhysicalVector(gradient, physicalGradient );
    it.Set( OutputPixelType( physicalGradient.GetDataPointer(), ImageDimension, false ) );
  }

  template <class T >
  void TransformOutputPixel( ImageRegionIterator< T > &it )
  {
    OutputPixelType correctedGradient;
    const OutputPixelType & gradient = it.Get();

    const unsigned int nComponents = NumericTraits<OutputPixelType>::GetLength( gradient )/ImageDimension;

    for (unsigned int nc = 0; nc < nComponents; nc++ )
      {
      GradientVectorType componentGradient;
      GradientVectorType correctedComponentGradient;
      for (unsigned int dim = 0; dim < ImageDimension; dim++ )
        {
        componentGradient[dim] = DefaultConvertPixelTraits<OutputPixelType>::GetNthComponent( nc*ImageDimension+dim, gradient );
        }
      it.GetImage()->TransformLocalVectorToPhysicalVector(componentGradient, correctedComponentGradient );
      for (unsigned int dim = 0; dim < ImageDimension; dim++ )
        {
        DefaultConvertPixelTraits<OutputPixelType>::SetNthComponent( nc*ImageDimension+dim, correctedGradient,
                                                                     correctedComponentGradient[dim] );
        }
      it.Set(correctedGradient);
      }
  }

  template <template<class, unsigned int> class P, class T, unsigned int N>
    void TransformOutputPixel( ImageRegionIterator< Image< P<T,N>, N > > &it )
  {
    const OutputPixelType gradient = it.Get();
    // This uses the more efficient set by reference method
    it.GetImage()->TransformLocalVectorToPhysicalVector(gradient, it.Value() );
  }


  GradientRecursiveGaussianImageFilter(const Self &); //purposely not
                                                      // implemented
  void operator=(const Self &);                       //purposely not

  // implemented

  std::vector< GaussianFilterPointer > m_SmoothingFilters;
  DerivativeFilterPointer              m_DerivativeFilter;
  OutputImageAdaptorPointer            m_ImageAdaptor;

  bool m_NormalizeAcrossScale;

  bool m_UseImageDirection;
};
} // end namespace itk

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

#endif