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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 itkMutualInformationHistogramImageToImageMetric_h
#define itkMutualInformationHistogramImageToImageMetric_h
#include "itkHistogramImageToImageMetric.h"
namespace itk
{
/** \class MutualInformationHistogramImageToImageMetric
* \brief Computes the mutual information between two images to be
* registered using the histograms of the intensities in the images.
* This class is templated over the type of the fixed and moving
* images to be compared.
*
* This metric computes the similarity measure between pixels in the
* moving image and pixels in the fixed images using a histogram.
*
* \ingroup RegistrationMetrics
* \ingroup ITKRegistrationCommon
*/
template <typename TFixedImage, typename TMovingImage>
class ITK_TEMPLATE_EXPORT MutualInformationHistogramImageToImageMetric
: public HistogramImageToImageMetric<TFixedImage, TMovingImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(MutualInformationHistogramImageToImageMetric);
/** Standard class type aliases. */
using Self = MutualInformationHistogramImageToImageMetric;
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(MutualInformationHistogramImageToImageMetric);
/** 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. */
MutualInformationHistogramImageToImageMetric() = default;
~MutualInformationHistogramImageToImageMetric() override = default;
/** Evaluates the mutual information from the histogram. */
MeasureType
EvaluateMeasure(HistogramType & histogram) const override;
};
} // End namespace itk.
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkMutualInformationHistogramImageToImageMetric.hxx"
#endif
#endif // itkMutualInformationHistogramImageToImageMetric_h
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