www.pudn.com > firev0.01.rar > arccosfidelity.hpp

/*
This file is part of the FIRE -- Flexible Image Retrieval System

FIRE 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.

FIRE 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 FIRE; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#ifndef __arccosfidelity_hpp
#define __arccosfidelity_hpp

#include 
#include "basedist.hpp"
/** 
 * This class implements the Chi-square distance as subclass of
 * BaseDist. The functions itself are not documented. @see BaseDist
 * for further information.
 */
class ArccosFidelity : public BaseDist {

public:
  ArccosFidelity() {};

  virtual double dist(const BaseFeature *a, const BaseFeature *b) const {
    double result=.0;
    unsigned int nOfBins=a->size();
    double n1, n2;
    for(unsigned int i=0;ioperator[](i);
      n2=b->operator[](i);
      result+=sqrt(n1)*sqrt(n2);
    }
    return 2.0/M_PI*acos(result);
  }

  virtual double dist(const BaseFeature *a, const vector &b) const {
    double result=.0;
    unsigned int nOfBins=a->size();
    double n1, n2;
    for(unsigned int i=0;ioperator[](i);
      n2=b[i];
      
      result+=sqrt(n1)*sqrt(n2);
    }
    return 2.0/M_PI*acos(result);
  }
  
  virtual std::string name() {
    return "arccosfidelity";
  }


};


#endif