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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkMeanSquareRegistrationFunction_h
#define itkMeanSquareRegistrationFunction_h
#include "itkPDEDeformableRegistrationFunction.h"
#include "itkPoint.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkCentralDifferenceImageFunction.h"
namespace itk
{
/**
* \class MeanSquareRegistrationFunction
*
* This class encapsulate the PDE which drives the demons registration
* algorithm. It is used by MeanSquareRegistrationFilter to compute the
* output displacement field which will map a moving image onto a
* a fixed image.
*
* Non-integer moving image values are obtained by using
* interpolation. The default interpolator is of type
* LinearInterpolateImageFunction. The user may set other
* interpolators via method SetMovingImageInterpolator. Note that the input
* interpolator must derive from baseclass InterpolateImageFunction.
*
* This class is templated over the fixed image type, moving image type,
* and the displacement field type.
*
* \warning This filter assumes that the fixed image type, moving image type
* and displacement field type all have the same number of dimensions.
*
* \sa MeanSquareRegistrationFilter
* \ingroup FiniteDifferenceFunctions
* \ingroup ITKRegistrationCommon
*/
template <typename TFixedImage, typename TMovingImage, typename TDisplacementField>
class ITK_TEMPLATE_EXPORT MeanSquareRegistrationFunction
: public PDEDeformableRegistrationFunction<TFixedImage, TMovingImage, TDisplacementField>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(MeanSquareRegistrationFunction);
/** Standard class type aliases. */
using Self = MeanSquareRegistrationFunction;
using Superclass = PDEDeformableRegistrationFunction<TFixedImage, TMovingImage, TDisplacementField>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(MeanSquareRegistrationFunction);
/** MovingImage image type. */
using typename Superclass::MovingImageType;
using typename Superclass::MovingImagePointer;
/** FixedImage image type. */
using typename Superclass::FixedImageType;
using typename Superclass::FixedImagePointer;
using IndexType = typename FixedImageType::IndexType;
using SizeType = typename FixedImageType::SizeType;
using SpacingType = typename FixedImageType::SpacingType;
/** Displacement field type. */
using typename Superclass::DisplacementFieldType;
using DisplacementFieldPixelType = typename DisplacementFieldType::PixelType;
using typename Superclass::DisplacementFieldTypePointer;
/** Inherit some enums from the superclass. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
/** Inherit some enums from the superclass. */
using typename Superclass::PixelType;
using typename Superclass::RadiusType;
using typename Superclass::NeighborhoodType;
using typename Superclass::FloatOffsetType;
using typename Superclass::TimeStepType;
/** Interpolator type. */
using CoordinateType = double;
using CoordRepType = CoordinateType;
using InterpolatorType = InterpolateImageFunction<MovingImageType, CoordRepType>;
using InterpolatorPointer = typename InterpolatorType::Pointer;
using PointType = typename InterpolatorType::PointType;
using DefaultInterpolatorType = LinearInterpolateImageFunction<MovingImageType, CoordRepType>;
/** Covariant vector type. */
using CovariantVectorType = CovariantVector<double, Self::ImageDimension>;
/** Gradient calculator type. */
using GradientCalculatorType = CentralDifferenceImageFunction<FixedImageType>;
using GradientCalculatorPointer = typename GradientCalculatorType::Pointer;
/** Set the moving image interpolator. */
void
SetMovingImageInterpolator(InterpolatorType * ptr)
{
m_MovingImageInterpolator = ptr;
}
/** Get the moving image interpolator. */
InterpolatorType *
GetMovingImageInterpolator()
{
return m_MovingImageInterpolator;
}
/** This class uses a constant timestep of 1. */
TimeStepType
ComputeGlobalTimeStep(void * itkNotUsed(GlobalData)) const override
{
return m_TimeStep;
}
/** Return a pointer to a global data structure that is passed to
* this object from the solver at each calculation. */
void *
GetGlobalDataPointer() const override
{
auto * global = new GlobalDataStruct();
return global;
}
/** Release memory for global data structure. */
void
ReleaseGlobalDataPointer(void * GlobalData) const override
{
delete (GlobalDataStruct *)GlobalData;
}
/** Set the object's state before each iteration. */
void
InitializeIteration() override;
/** Compute update at a non boundary neighbourhood.
*
* Called by a finite difference solver image filter at each pixel that does not lie on a data set boundary.
*/
PixelType
ComputeUpdate(const NeighborhoodType & neighborhood,
void * globalData,
const FloatOffsetType & offset = FloatOffsetType(0.0)) override;
protected:
MeanSquareRegistrationFunction();
~MeanSquareRegistrationFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** FixedImage image neighborhood iterator type. */
using FixedImageNeighborhoodIteratorType = ConstNeighborhoodIterator<FixedImageType>;
/** A global data type for this class of equation. Used to store
* iterators for the fixed image. */
struct GlobalDataStruct
{
FixedImageNeighborhoodIteratorType m_FixedImageIterator;
};
private:
/** Cache fixed image information. */
SpacingType m_FixedImageSpacing{};
/** Function to compute derivatives of the fixed image. */
GradientCalculatorPointer m_FixedImageGradientCalculator{};
/** Function to interpolate the moving image. */
InterpolatorPointer m_MovingImageInterpolator{};
/** The global timestep. */
TimeStepType m_TimeStep{};
/** Threshold below which the denominator term is considered zero. */
double m_DenominatorThreshold{};
/** Threshold below which two intensity value are assumed to match. */
double m_IntensityDifferenceThreshold{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkMeanSquareRegistrationFunction.hxx"
#endif
#endif
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