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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 itkMeanReciprocalSquareDifferenceImageToImageMetric_h
#define itkMeanReciprocalSquareDifferenceImageToImageMetric_h
#include "itkImageToImageMetric.h"
#include "itkPoint.h"
namespace itk
{
/** \class MeanReciprocalSquareDifferenceImageToImageMetric
* \brief Computes similarity between two objects to be registered
*
* This Class is templated over the type of the Images to be compared and
* over the type of transformation and Interpolator to be used.
*
* This metric computes the sum of squared differences between pixels in
* the moving image and pixels in the fixed image after passing the squared
* difference through a function of type \f$ \frac{1}{1+x} \f$.
* Spatial correspondence between both images is established through a
* Transform. Pixel values are taken from the Moving image. Their positions
* are mapped to the Fixed image and result in general in non-grid position
* on it. Values at these non-grid position of the Fixed image are interpolated
* using a user-selected Interpolator.
*
* \ingroup RegistrationMetrics
* \ingroup ITKRegistrationCommon
*/
template <typename TFixedImage, typename TMovingImage>
class ITK_TEMPLATE_EXPORT MeanReciprocalSquareDifferenceImageToImageMetric
: public ImageToImageMetric<TFixedImage, TMovingImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(MeanReciprocalSquareDifferenceImageToImageMetric);
/** Standard class type aliases. */
using Self = MeanReciprocalSquareDifferenceImageToImageMetric;
using Superclass = ImageToImageMetric<TFixedImage, TMovingImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(MeanReciprocalSquareDifferenceImageToImageMetric);
/** Types transferred from the base class */
using typename Superclass::TransformType;
using typename Superclass::TransformPointer;
using typename Superclass::TransformParametersType;
using typename Superclass::TransformJacobianType;
using typename Superclass::InputPointType;
using typename Superclass::OutputPointType;
using typename Superclass::MeasureType;
using typename Superclass::DerivativeType;
using typename Superclass::FixedImageType;
using typename Superclass::MovingImageType;
using typename Superclass::FixedImageConstPointer;
using typename Superclass::MovingImageConstPointer;
/** Get the derivatives of the match measure. */
void
GetDerivative(const TransformParametersType & parameters, DerivativeType & derivative) const override;
/** Get the value for single valued optimizers. */
MeasureType
GetValue(const TransformParametersType & parameters) const override;
/** Get value and derivatives for multiple valued optimizers. */
void
GetValueAndDerivative(const TransformParametersType & parameters,
MeasureType & Value,
DerivativeType & Derivative) const override;
/** Set/Get Lambda value. This factor regulates the capture radius of
this metric */
itkGetConstMacro(Lambda, double);
itkSetMacro(Lambda, double);
/** Set/Get Delta value. This value is used as the differential in the
* computation of the metric derivative using the finite differences method. */
itkGetConstMacro(Delta, double);
itkSetMacro(Delta, double);
protected:
MeanReciprocalSquareDifferenceImageToImageMetric();
~MeanReciprocalSquareDifferenceImageToImageMetric() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
private:
double m_Lambda{};
double m_Delta{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkMeanReciprocalSquareDifferenceImageToImageMetric.hxx"
#endif
#endif
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