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itkSymmetricForcesDemonsRegistrationFilter.h
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itkSymmetricForcesDemonsRegistrationFilter.h
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkSymmetricForcesDemonsRegistrationFilter.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 _itkSymmetricForcesDemonsRegistrationFilter_h_
#define _itkSymmetricForcesDemonsRegistrationFilter_h_
#include "itkPDEDeformableRegistrationFilter.h"
#include "itkSymmetricForcesDemonsRegistrationFunction.h"
namespace itk {
/** \class SymmetricForcesDemonsRegistrationFilter
* \brief Deformably register two images using the demons algorithm.
*
* This class was contributed by Corinne Mattmann, ETH Zurich, Switzerland.
* based on a variation of the DemonsRegistrationFilter. The basic modification
* is to use equation (5) from Thirion's paper along with the modification for
* avoiding large deformations when gradients have small values.
*
* SymmetricForcesDemonsRegistrationFilter implements the demons deformable algorithm that
* register two images by computing the deformation field which will map a
* moving image onto a fixed image.
*
* A deformation field is represented as a image whose pixel type is some
* vector type with at least N elements, where N is the dimension of
* the fixed image. The vector type must support element access via operator
* []. It is assumed that the vector elements behave like floating point
* scalars.
*
* This class is templated over the fixed image type, moving image type
* and the deformation field type.
*
* The input fixed and moving images are set via methods SetFixedImage
* and SetMovingImage respectively. An initial deformation field maybe set via
* SetInitialDeformationField or SetInput. If no initial field is set,
* a zero field is used as the initial condition.
*
* The algorithm has one parameters: the number of iteration to be performed.
*
* The output deformation field can be obtained via methods GetOutput
* or GetDeformationField.
*
* This class make use of the finite difference solver hierarchy. Update
* for each iteration is computed in DemonsRegistrationFunction.
*
* \warning This filter assumes that the fixed image type, moving image type
* and deformation field type all have the same number of dimensions.
*
* \sa SymmetricForcesDemonsRegistrationFunction
* \sa DemonsRegistrationFilter
* \sa DemonsRegistrationFunction
* \ingroup DeformableImageRegistration MultiThreaded
*/
template<class TFixedImage, class TMovingImage, class TDeformationField>
class ITK_EXPORT SymmetricForcesDemonsRegistrationFilter :
public PDEDeformableRegistrationFilter< TFixedImage, TMovingImage,
TDeformationField>
{
public:
/** Standard class typedefs. */
typedef SymmetricForcesDemonsRegistrationFilter Self;
typedef PDEDeformableRegistrationFilter<
TFixedImage, TMovingImage,TDeformationField> 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( SymmetricForcesDemonsRegistrationFilter,
PDEDeformableRegistrationFilter );
/** FixedImage image type. */
typedef typename Superclass::FixedImageType FixedImageType;
typedef typename Superclass::FixedImagePointer FixedImagePointer;
/** MovingImage image type. */
typedef typename Superclass::MovingImageType MovingImageType;
typedef typename Superclass::MovingImagePointer MovingImagePointer;
/** Deformation field type. */
typedef typename Superclass::DeformationFieldType
DeformationFieldType;
typedef typename Superclass::DeformationFieldPointer
DeformationFieldPointer;
/** FiniteDifferenceFunction type. */
typedef typename Superclass::FiniteDifferenceFunctionType
FiniteDifferenceFunctionType;
/** Take timestep type from the FiniteDifferenceFunction. */
typedef typename FiniteDifferenceFunctionType::TimeStepType TimeStepType;
/** DemonsRegistrationFilterFunction type. */
typedef SymmetricForcesDemonsRegistrationFunction<FixedImageType,MovingImageType,
DeformationFieldType> DemonsRegistrationFunctionType;
/** Get the metric value. The metric value is the mean square difference
* in intensity between the fixed image and transforming moving image
* computed over the the overlapping region between the two images.
* This value is calculated for the current iteration */
virtual double GetMetric() const;
virtual const double &GetRMSChange() const;
/** Set/Get the threshold below which the absolute difference of
* intensity yields a match. When the intensities match between a
* moving and fixed image pixel, the update vector (for that
* iteration) will be the zero vector. Default is 0.001. */
virtual void SetIntensityDifferenceThreshold(double);
virtual double GetIntensityDifferenceThreshold() const;
protected:
SymmetricForcesDemonsRegistrationFilter();
~SymmetricForcesDemonsRegistrationFilter() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** Initialize the state of filter and equation before each iteration. */
virtual void InitializeIteration();
/** Apply update. */
virtual void ApplyUpdate(TimeStepType dt);
private:
SymmetricForcesDemonsRegistrationFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSymmetricForcesDemonsRegistrationFilter.txx"
#endif
#endif