itkDisplacementFieldJacobianDeterminantFilter.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 itkDisplacementFieldJacobianDeterminantFilter_h
#define itkDisplacementFieldJacobianDeterminantFilter_h

#include "itkNeighborhoodIterator.h"
#include "itkImageToImageFilter.h"
#include "itkVector.h"
#include "vnl/vnl_matrix.h"
#include "vnl/vnl_det.h"

namespace itk
{
template< typename TInputImage,
          typename TRealType = float,
          typename TOutputImage = Image< TRealType,
                                         TInputImage::ImageDimension >
          >
class DisplacementFieldJacobianDeterminantFilter:
  public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
  typedef DisplacementFieldJacobianDeterminantFilter      Self;
  typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(DisplacementFieldJacobianDeterminantFilter, ImageToImageFilter);

  typedef typename TOutputImage::PixelType OutputPixelType;
  typedef typename TInputImage::PixelType  InputPixelType;

  typedef TInputImage                       InputImageType;
  typedef TOutputImage                      OutputImageType;
  typedef typename InputImageType::Pointer  InputImagePointer;
  typedef typename OutputImageType::Pointer OutputImagePointer;

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

  itkStaticConstMacro(VectorDimension, unsigned int,
                      InputPixelType::Dimension);

  typedef TRealType RealType;
  typedef Vector< TRealType, InputPixelType::Dimension >
                    RealVectorType;
  typedef Image< RealVectorType, TInputImage::ImageDimension >
                    RealVectorImageType;

  typedef ConstNeighborhoodIterator< RealVectorImageType >   ConstNeighborhoodIteratorType;
  typedef typename ConstNeighborhoodIteratorType::RadiusType RadiusType;

  typedef typename Superclass::OutputImageRegionType OutputImageRegionType;

  virtual void GenerateInputRequestedRegion() ITK_OVERRIDE;

  void SetUseImageSpacingOn()
  { this->SetUseImageSpacing(true); }

  void SetUseImageSpacingOff()
  { this->SetUseImageSpacing(false); }

  void SetUseImageSpacing(bool);

  itkGetConstMacro(UseImageSpacing, bool);

  typedef FixedArray< TRealType, ImageDimension > WeightsType;

  void SetDerivativeWeights(const WeightsType &);
  itkGetConstReferenceMacro(DerivativeWeights, WeightsType);

protected:
  DisplacementFieldJacobianDeterminantFilter();
  virtual ~DisplacementFieldJacobianDeterminantFilter() {}

  void BeforeThreadedGenerateData() ITK_OVERRIDE;

  void ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
                            ThreadIdType threadId) ITK_OVERRIDE;

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

  typedef typename InputImageType::Superclass ImageBaseType;

  itkGetConstObjectMacro(RealValuedInputImage, ImageBaseType);

  itkGetConstReferenceMacro(NeighborhoodRadius, RadiusType);
  itkSetMacro(NeighborhoodRadius, RadiusType);

  virtual TRealType EvaluateAtNeighborhood(const ConstNeighborhoodIteratorType & it) const;

  WeightsType m_DerivativeWeights;

  WeightsType m_HalfDerivativeWeights;

private:
  bool m_UseImageSpacing;

  ThreadIdType m_RequestedNumberOfThreads;

  typename ImageBaseType::ConstPointer m_RealValuedInputImage;

  DisplacementFieldJacobianDeterminantFilter(const Self &) ITK_DELETE_FUNCTION;
  void operator=(const Self &) ITK_DELETE_FUNCTION;

  RadiusType m_NeighborhoodRadius;
};
} // end namespace itk

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

#endif