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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 itkNormalizedMutualInformationHistogramImageToImageMetric_h
#define itkNormalizedMutualInformationHistogramImageToImageMetric_h
#include "itkHistogramImageToImageMetric.h"
namespace itk
{
/** \class NormalizedMutualInformationHistogramImageToImageMetric
* \brief Computes normalized mutual information between two images to
* be registered using the histograms of the intensities in the images.
*
* The type of Normalize Mutual Information implemented in this class
* is given by the equation
*
* \f[ \frac{ H(A) + H(B) }{ H(A,B) } \f]
* Where \$ H(A) \$ is the entropy of image \$ A \$,
* \$ H(B) \$ is the entropy of image \$ B \$, and
* \$ H(A,B) \$ is the joint entropy of images \$ A \$ and \$ B \$.
*
* Details of this implementation can be found in the book
* "Medical Image Registration" by Hajnal, Hill and Hawkes.
* The book is available online at
* https://books.google.com/books?id=2dtQNsk-qBQC
* The implementation of this class corresponds to equation (30) in
* Chapter 3 of this book. Note that by slightly changing this class
* it will be trivial to compute the Normalized Mutual Information
* measures defined in equations (28) and (29) of the same book.
*
* This class is templated over the type of the fixed and moving
* images to be compared.
* \ingroup RegistrationMetrics
* \ingroup ITKRegistrationCommon
*/
template <typename TFixedImage, typename TMovingImage>
class ITK_TEMPLATE_EXPORT NormalizedMutualInformationHistogramImageToImageMetric
: public HistogramImageToImageMetric<TFixedImage, TMovingImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(NormalizedMutualInformationHistogramImageToImageMetric);
/** Standard class type aliases. */
using Self = NormalizedMutualInformationHistogramImageToImageMetric;
using Superclass = HistogramImageToImageMetric<TFixedImage, TMovingImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(NormalizedMutualInformationHistogramImageToImageMetric);
/** Types transferred from the base class */
using typename Superclass::RealType;
using typename Superclass::TransformType;
using typename Superclass::TransformPointer;
using typename Superclass::TransformParametersType;
using typename Superclass::TransformJacobianType;
using typename Superclass::GradientPixelType;
using typename Superclass::MeasureType;
using typename Superclass::DerivativeType;
using typename Superclass::FixedImageType;
using typename Superclass::MovingImageType;
using typename Superclass::FixedImageConstPointer;
using typename Superclass::MovingImageConstPointer;
using typename Superclass::HistogramType;
using HistogramFrequencyType = typename HistogramType::AbsoluteFrequencyType;
using HistogramIteratorType = typename HistogramType::Iterator;
using HistogramMeasurementVectorType = typename HistogramType::MeasurementVectorType;
protected:
/** Constructor is protected to ensure that \c New() function is used to
create instances. */
NormalizedMutualInformationHistogramImageToImageMetric() = default;
~NormalizedMutualInformationHistogramImageToImageMetric() override = default;
/** Evaluates the normalized mutual information from the histogram. */
MeasureType
EvaluateMeasure(HistogramType & histogram) const override;
};
} // End namespace itk.
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkNormalizedMutualInformationHistogramImageToImageMetric.hxx"
#endif
#endif // itkNormalizedMutualInformationHistogramImageToImageMetric_h
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