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/* -*- mode: c++ -*-
*/
/*
GIFT, a flexible content based image retrieval system.
Copyright (C) 1998, 1999, 2000, 2001, 2002, CUI University of Geneva
Copyright (C) 2003, 2004 Bayreuth University
2005 Bamberg University
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _CSQUASHER
#define _CSQUASHER
#include "libGIFTAcDistanceMatrix/include/uses-declarations.h"
#include <functional>
//
// in general for squashing: for the case that
// FARTHER much farther away than CLOSER
// the probability is supposed to be one
//
//the base
class CSquasher:public unary_function<double,double>{
protected:
double mSigma;
public:
///the real squashing function
virtual double operator()(double inCloser,
double inFarther)const=0;
///setting a parameter how much to believe the user
inline void setSigma(double inSigma){
mSigma=inSigma;
}
};
class CStandardSquasher:public CSquasher{
public:
///
virtual double operator()(double inCloser,
double inFarther)const;
};
class CDiscreteSquasher:public CSquasher{
public:
virtual double operator()(double inCloser,
double inFarther)const;
};
class CGaussianSquasher:public CSquasher{
public:
virtual double operator()(double inCloser,
double inFarther)const;
};
class CFlexibleSquasher:public CSquasher{
public:
virtual double operator()(double inCloser,
double inFarther)const;
};
#endif
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