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/*
//
// Copyright 2004-2010 SRI International
//
// Copyright 1997-2009 Torsten Rohlfing
//
// 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: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#ifndef __cmtkTypedArrayFunctionHistogramMatching_h_included_
#define __cmtkTypedArrayFunctionHistogramMatching_h_included_
#include <cmtkconfig.h>
#include <Base/cmtkTypedArrayFunction.h>
#include <Base/cmtkTypedArray.h>
#include <Base/cmtkHistogram.h>
namespace
cmtk
{
/** \addtogroup Base */
//@{
/** Lookup class for histogram intensity matching.
* This class provides a lookup table that is computed from the histograms of two
* cmtk::TypedArray objects. The lookup can then be applied to the "variable" array
* so that its distribution afterwards matches, as closely as possible, the distribution
* of the "fixed" array.
*
* To apply histogram matching to "variableArray" based on the distribution of "fixedArray",
* use the following:
*\code
* variableArray->ApplyFunction( cmtk::TypedArrayFunctionHistogramMatching( variableArray, fixedArray ) );
*\endcode
* The variable array for setting up the matching function need not be the same as the array
* that the function is applied to:
*\code
* variableArray->ApplyFunction( cmtk::TypedArrayFunctionHistogramMatching( testArray, fixedArray ) );
*\endcode
*/
class
TypedArrayFunctionHistogramMatching
/// Inherit from base class.
: public TypedArrayFunction
{
public:
/// This class.
typedef TypedArrayFunctionHistogramMatching Self;
/// Default number of histogram bins.
static const size_t DefaultNumberOfHistogramBins = 1024;
/// Histogram type.
typedef Histogram<unsigned int> HistogramType;
/// Constructor: build lookup from two data arrays.
TypedArrayFunctionHistogramMatching( const TypedArray& variableArray, const TypedArray& fixedArray, const size_t numberOfHistogramBins = Self::DefaultNumberOfHistogramBins );
/// Constructor: build lookup from two histograms.
TypedArrayFunctionHistogramMatching( const Self::HistogramType& variableHistogram, const Self::HistogramType& fixedHistogram );
/// Map a single value from the variable array to its new value.
virtual Types::DataItem operator()( const Types::DataItem valueIn ) const;
private:
/// Fixed array histogram.
HistogramType::SmartPtr m_FixedArrayHistogram;
/// Variable array histogram.
HistogramType::SmartPtr m_VariableArrayHistogram;
/// Lookup table that translates between the two histograms.
std::vector<unsigned int> m_Lookup;
/// Create lookup from histograms.
void CreateLookup();
};
//@}
} // namespace cmtk
#endif // #ifndef __cmtkTypedArrayFunctionHistogramMatching_h_included_
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