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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkMutualInformationHistogramImageToImageMetric.h,v $
Language: C++
Date: $Date: 2003-09-10 14:28:35 $
Version: $Revision: 1.3 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#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 */
template <class TFixedImage, class TMovingImage>
class ITK_EXPORT MutualInformationHistogramImageToImageMetric :
public HistogramImageToImageMetric<TFixedImage, TMovingImage>
{
public:
/** Standard class typedefs. */
typedef MutualInformationHistogramImageToImageMetric Self;
typedef HistogramImageToImageMetric<TFixedImage, TMovingImage> 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(MutualInformationHistogramImageToImageMetric,
HistogramImageToImageMetric);
/** Types transferred from the base class */
typedef typename Superclass::RealType RealType;
typedef typename Superclass::TransformType TransformType;
typedef typename Superclass::TransformPointer TransformPointer;
typedef typename Superclass::TransformParametersType
TransformParametersType;
typedef typename Superclass::TransformJacobianType TransformJacobianType;
typedef typename Superclass::GradientPixelType GradientPixelType;
typedef typename Superclass::MeasureType MeasureType;
typedef typename Superclass::DerivativeType DerivativeType;
typedef typename Superclass::FixedImageType FixedImageType;
typedef typename Superclass::MovingImageType MovingImageType;
typedef typename Superclass::FixedImageConstPointer FixedImageConstPointer;
typedef typename Superclass::MovingImageConstPointer
MovingImageConstPointer;
typedef typename Superclass::HistogramType HistogramType;
typedef typename HistogramType::FrequencyType HistogramFrequencyType;
typedef typename HistogramType::Iterator HistogramIteratorType;
typedef typename HistogramType::MeasurementVectorType
HistogramMeasurementVectorType;
protected:
/** Constructor is protected to ensure that \c New() function is used to
create instances. */
MutualInformationHistogramImageToImageMetric(){}
virtual ~MutualInformationHistogramImageToImageMetric(){}
/** Evaluates the mutual information from the histogram. */
virtual MeasureType EvaluateMeasure(HistogramType& histogram) const;
private:
// Purposely not implemented.
MutualInformationHistogramImageToImageMetric(Self const&);
void operator=(Self const&); // Purposely not implemented.
};
} // End namespace itk.
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMutualInformationHistogramImageToImageMetric.txx"
#endif
#endif // __itkMutualInformationHistogramImageToImageMetric_h
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