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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
{
/** \addtogroup Registration */
//@{
#ifdef _MSC_VER
#pragma warning (disable:4521)
#endif
/** Base class for voxel metrics with pre-converted image data.
*/
class ImagePairSimilarityMeasureNMI :
/// Inherit generic image pair similarity class.
public ImagePairSimilarityJointHistogram
{
public:
/// This type.
typedef ImagePairSimilarityMeasureNMI Self;
/// Smart pointer.
typedef SmartPointer<Self> SmartPtr;
/// Return type: same as cmtk::Functional.
typedef Functional::ReturnType ReturnType;
/** Constructor.
* For reference and floating volume, InitDataset is called.
*\param refVolume The reference (fixed) volume.
*\param fltVolume The model (transformed) volume.
*\param interpolation ID of the selected floating image interpolation.
*/
ImagePairSimilarityMeasureNMI( UniformVolume::SmartConstPtr& refVolume, UniformVolume::SmartConstPtr& fltVolume, const Interpolators::InterpolationEnum interpolation = Interpolators::DEFAULT )
: ImagePairSimilarityJointHistogram( refVolume, fltVolume, interpolation )
{}
/** Default constructor.
*/
ImagePairSimilarityMeasureNMI() {};
/** Virtual destructor.
*/
virtual ~ImagePairSimilarityMeasureNMI() {};
/// Get the value of the metric.
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_
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