cmtkImagePairSimilarityMeasureNMI.h

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/*
//
//  Copyright 1997-2009 Torsten Rohlfing
//
//  Copyright 2004-2011 SRI International
//
//  This file is part of the Computational Morphometry Toolkit.
//
//  http://www.nitrc.org/projects/cmtk/
//
//  The Computational Morphometry Toolkit is free software: you can
//  redistribute it and/or modify it under the terms of the GNU General Public
//  License as published by the Free Software Foundation, either version 3 of
//  the License, or (at your option) any later version.
//
//  The Computational Morphometry Toolkit is distributed in the hope that it
//  will be useful, but WITHOUT ANY WARRANTY; without even the implied
//  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License along
//  with the Computational Morphometry Toolkit.  If not, see
//  <http://www.gnu.org/licenses/>.
//
//  $Revision: 2752 $
//
//  $LastChangedDate: 2011-01-17 11:33:31 -0800 (Mon, 17 Jan 2011) $
//
//  $LastChangedBy: torstenrohlfing $
//
*/

#ifndef __cmtkImagePairSimilarityMeasureNMI_h_included_
#define __cmtkImagePairSimilarityMeasureNMI_h_included_

#include <cmtkconfig.h>

#include <Registration/cmtkImagePairSimilarityJointHistogram.h>

#include <Base/cmtkUniformVolume.h>

namespace
cmtk
{


#ifdef _MSC_VER
#pragma warning (disable:4521)
#endif

class ImagePairSimilarityMeasureNMI :
  public ImagePairSimilarityJointHistogram
{
public:
  typedef ImagePairSimilarityMeasureNMI Self;

  typedef SmartPointer<Self> SmartPtr;

  typedef Functional::ReturnType ReturnType;

  ImagePairSimilarityMeasureNMI( UniformVolume::SmartConstPtr& refVolume, UniformVolume::SmartConstPtr& fltVolume, const Interpolators::InterpolationEnum interpolation = Interpolators::DEFAULT )
    : ImagePairSimilarityJointHistogram( refVolume, fltVolume, interpolation )
  {}

  ImagePairSimilarityMeasureNMI() {};

  virtual ~ImagePairSimilarityMeasureNMI() {};

  virtual Self::ReturnType Get() const 
  {
    double HX, HY;
    
    this->m_JointHistogram.GetMarginalEntropies(HX,HY);
    const double HXY = this->m_JointHistogram.GetJointEntropy();
    
    return static_cast<Self::ReturnType>( (HX + HY) / HXY );
  }
};


} // namespace cmtk

#endif // #ifndef __cmtkImagePairSimilarityMeasureNMI_h_included_