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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkExponentialDeformationFieldImageFilter.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkExponentialDeformationFieldImageFilter_h
#define __itkExponentialDeformationFieldImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkDivideByConstantImageFilter.h"
#include "itkCastImageFilter.h"
#include "itkWarpVectorImageFilter.h"
#include "itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction.h"
#include "itkAddImageFilter.h"
namespace itk
{
/** \class ExponentialDeformationFieldImageFilter
* \brief Computes a diffeomorphic deformation field as the Lie group
* exponential of a vector field.
*
* ExponentialDeformationFieldImageFilter takes a 'smooth' vector field
* as input and computes the deformation field that is its exponential.
*
* Given that both the input and output deformation field are represented as
* discrete images with pixel type vector, the exponential will be only an
* estimation and will probably not correspond to a perfect exponential. The
* precision of the exponential can be improved at the price of increasing the
* computation time (number of iterations).
*
* The method used for computing the exponential deformation field is
* an iterative scaling and squaring (cf Arsigny et al., "A
* Log-Euclidean Framework for Statistics on Diffeomorphisms", MICCAI'06).
*
* \f[
* exp(\Phi) = exp( \frac{\Phi}{2^N} )^{2^N}
* \f]
*
*
* This filter expects both the input and output images to be of pixel type
* Vector.
*
* \author Tom Vercauteren, INRIA & Mauna Kea Technologies
*
* This implementation was taken from the Insight Journal paper:
* http://hdl.handle.net/1926/510
*
* \ingroup ImageToImageFilter
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT ExponentialDeformationFieldImageFilter:
public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
/** Standard class typedefs. */
typedef ExponentialDeformationFieldImageFilter Self;
typedef ImageToImageFilter<TInputImage,TOutputImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ExponentialDeformationFieldImageFilter, ImageToImageFilter);
/** Some convenient typedefs. */
typedef TInputImage InputImageType;
typedef typename InputImageType::Pointer InputImagePointer;
typedef typename InputImageType::ConstPointer InputImageConstPointer;
typedef typename InputImageType::PixelType InputPixelType;
typedef typename InputPixelType::RealValueType InputPixelRealValueType;
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::Pointer OutputImagePointer;
typedef typename OutputImageType::PixelType OutputPixelType;
/** Specify the maximum number of iteration. */
itkSetMacro(MaximumNumberOfIterations, unsigned int);
itkGetConstMacro(MaximumNumberOfIterations, unsigned int);
/** If AutomaticNumberOfIterations is off, the number of iterations is
* given by MaximumNumberOfIterations. If it is on, we try to get
* the lowest good number (which may not be larger than
* MaximumNumberOfIterations ) */
itkSetMacro( AutomaticNumberOfIterations, bool );
itkGetConstMacro( AutomaticNumberOfIterations, bool );
itkBooleanMacro(AutomaticNumberOfIterations);
/** If ComputeInverse is on, the filter will compute the exponential
* of the opposite (minus) of the input vector field. The output deformation
* fields computed with ComputeInverse set to on and off respectively
* therefore represent spatial transformations that are inverses of
* each other. */
itkSetMacro( ComputeInverse, bool );
itkGetConstMacro( ComputeInverse, bool );
itkBooleanMacro(ComputeInverse);
/** Image dimension. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
itkStaticConstMacro(OutputImageDimension, unsigned int,
TInputImage::ImageDimension );
itkStaticConstMacro(PixelDimension, unsigned int,
InputPixelType::Dimension );
itkStaticConstMacro(OutputPixelDimension, unsigned int,
OutputPixelType::Dimension );
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(OutputHasNumericTraitsCheck,
(Concept::HasNumericTraits<typename OutputPixelType::ValueType>));
itkConceptMacro(SameDimensionCheck1,
(Concept::SameDimension<ImageDimension,OutputImageDimension>));
itkConceptMacro(SameDimensionCheck2,
(Concept::SameDimension<ImageDimension,PixelDimension>));
itkConceptMacro(SameDimensionCheck3,
(Concept::SameDimension<ImageDimension,OutputPixelDimension>));
/** End concept checking */
#endif
protected:
ExponentialDeformationFieldImageFilter();
virtual ~ExponentialDeformationFieldImageFilter() {};
void PrintSelf(std::ostream& os, Indent indent) const;
/**
* GenerateData()
*/
void GenerateData();
typedef typename InputImageType::RegionType RegionType;
typedef DivideByConstantImageFilter<
InputImageType,
InputPixelRealValueType, OutputImageType > DivideByConstantType;
typedef CastImageFilter<
InputImageType, OutputImageType> CasterType;
typedef WarpVectorImageFilter<
OutputImageType,
OutputImageType, OutputImageType> VectorWarperType;
typedef VectorLinearInterpolateNearestNeighborExtrapolateImageFunction<
OutputImageType,double> FieldInterpolatorType;
typedef AddImageFilter<
OutputImageType, OutputImageType, OutputImageType> AdderType;
typedef typename DivideByConstantType::Pointer DivideByConstantPointer;
typedef typename CasterType::Pointer CasterPointer;
typedef typename VectorWarperType::Pointer VectorWarperPointer;
typedef typename FieldInterpolatorType::Pointer FieldInterpolatorPointer;
typedef typename FieldInterpolatorType::OutputType FieldInterpolatorOutputType;
typedef typename AdderType::Pointer AdderPointer;
private:
ExponentialDeformationFieldImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
bool m_AutomaticNumberOfIterations;
unsigned int m_MaximumNumberOfIterations;
bool m_ComputeInverse;
DivideByConstantPointer m_Divider;
CasterPointer m_Caster;
VectorWarperPointer m_Warper;
AdderPointer m_Adder;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkExponentialDeformationFieldImageFilter.txx"
#endif
#endif
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