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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 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
* SetInitialDisplacementField 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 GetDisplacementField.
*
* 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
* \ingroup ITKPDEDeformableRegistration
*/
template< typename TFixedImage, typename TMovingImage, typename TDisplacementField >
class ITK_TEMPLATE_EXPORT SymmetricForcesDemonsRegistrationFilter:
public PDEDeformableRegistrationFilter< TFixedImage, TMovingImage,
TDisplacementField >
{
public:
/** Standard class typedefs. */
typedef SymmetricForcesDemonsRegistrationFilter Self;
typedef PDEDeformableRegistrationFilter< TFixedImage, TMovingImage, TDisplacementField > 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::DisplacementFieldType
DisplacementFieldType;
typedef typename Superclass::DisplacementFieldPointer
DisplacementFieldPointer;
/** FiniteDifferenceFunction type. */
typedef typename Superclass::FiniteDifferenceFunctionType
FiniteDifferenceFunctionType;
/** Take timestep type from the FiniteDifferenceFunction. */
typedef typename FiniteDifferenceFunctionType::TimeStepType TimeStepType;
/** DemonsRegistrationFilterFunction type. */
typedef SymmetricForcesDemonsRegistrationFunction< FixedImageType, MovingImageType,
DisplacementFieldType > 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 ITK_OVERRIDE;
/** 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() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Initialize the state of filter and equation before each iteration. */
virtual void InitializeIteration() ITK_OVERRIDE;
/** Apply update. */
virtual void ApplyUpdate(const TimeStepType& dt) ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(SymmetricForcesDemonsRegistrationFilter);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSymmetricForcesDemonsRegistrationFilter.hxx"
#endif
#endif
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