itkVariationalRegistrationCurvatureRegularizer.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 itkVariationalRegistrationCurvatureRegularizer_h
#define itkVariationalRegistrationCurvatureRegularizer_h

#include "itkVariationalRegistrationRegularizer.h"
#include "itkMultiThreader.h"

#if defined( ITK_USE_FFTWD ) || defined( ITK_USE_FFTWF )

// other includes:
#include "itkFFTWCommon.h"

namespace itk {

template< class TDisplacementField >
class VariationalRegistrationCurvatureRegularizer
  : public VariationalRegistrationRegularizer< TDisplacementField >
{
public:
  typedef VariationalRegistrationCurvatureRegularizer             Self;
  typedef VariationalRegistrationRegularizer<TDisplacementField > Superclass;
  typedef SmartPointer< Self >                                    Pointer;
  typedef SmartPointer< const Self >                              ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro( VariationalRegistrationCurvatureRegularizer, VariationalRegistrationRegularizer);

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

  typedef typename Superclass::DisplacementFieldType         DisplacementFieldType;
  typedef typename Superclass::DisplacementFieldPointer      DisplacementFieldPointer;
  typedef typename Superclass::DisplacementFieldConstPointer DisplacementFieldConstPointer;
  typedef typename Superclass::PixelType                     PixelType;
  typedef typename Superclass::ValueType                     ValueType;
  typedef typename DisplacementFieldType::SizeType::SizeValueType
                                                             OffsetValueType;

  #if defined( ITK_USE_FFTWD )
  //Prefer to use double precision
  typedef double RealTypeFFT;
  #else
    #if defined( ITK_USE_FFTWF )
      //Allow to use single precision
      #warning "Using single precision for FFT computations!"
  typedef float RealTypeFFT;
    #endif
  #endif

  typedef typename fftw::Proxy<RealTypeFFT> FFTWProxyType;

  itkSetMacro( Alpha, ValueType );

  itkGetConstMacro( Alpha, ValueType );

protected:
  VariationalRegistrationCurvatureRegularizer();
  ~VariationalRegistrationCurvatureRegularizer();

  virtual void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void GenerateData();

  virtual void Initialize();

  virtual bool InitializeCurvatureFFTPlans();

  virtual bool InitializeCurvatureDiagonalMatrix();

  virtual void Regularize();

  virtual void SolveCurvatureLES(unsigned int currentDimension);

  virtual void ThreadedSolveCurvatureLES(unsigned int currentDimension, OffsetValueType from, OffsetValueType to );

  typename DisplacementFieldType::IndexType CalculateImageIndex(
      OffsetValueType offset );

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

  ValueType m_Alpha;

  typename DisplacementFieldType::SpacingType m_Spacing;

  typename DisplacementFieldType::SizeType    m_Size;

  OffsetValueType m_TotalSize;

  OffsetValueType m_OffsetTable[ImageDimension];

  RealTypeFFT * m_DiagonalMatrix[ImageDimension];

  struct CurvatureFFTThreadStruct
    {
    VariationalRegistrationCurvatureRegularizer *Filter;
    OffsetValueType totalSize;
    unsigned int currentDimension;
    };

  static ITK_THREAD_RETURN_TYPE SolveCurvatureLESThreaderCallback(void *vargs);
};

}

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

#endif
#endif