DistribGF.h

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/*
        This file is part of ALIZE which is an open-source tool for 
        speaker recognition.

    ALIZE is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as 
    published by the Free Software Foundation, either version 3 of 
    the License, or any later version.

    ALIZE 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public 
    License along with ALIZE.
    If not, see <http://www.gnu.org/licenses/>.
        
        ALIZE is a development project initiated by the ELISA consortium
        [alize.univ-avignon.fr/] and funded by the French Research 
        Ministry in the framework of the TECHNOLANGUE program 
        [www.technolangue.net]

        The ALIZE project team wants to highlight the limits of voice
        authentication in a forensic context.
        The "Person  Authentification by Voice: A Need of Caution" paper 
        proposes a good overview of this point (cf. "Person  
        Authentification by Voice: A Need of Caution", Bonastre J.F., 
        Bimbot F., Boe L.J., Campbell J.P., Douglas D.A., Magrin-
        chagnolleau I., Eurospeech 2003, Genova].
        The conclusion of the paper of the paper is proposed bellow:
        [Currently, it is not possible to completely determine whether the 
        similarity between two recordings is due to the speaker or to other 
        factors, especially when: (a) the speaker does not cooperate, (b) there 
        is no control over recording equipment, (c) recording conditions are not 
        known, (d) one does not know whether the voice was disguised and, to a 
        lesser extent, (e) the linguistic content of the message is not 
        controlled. Caution and judgment must be exercised when applying speaker 
        recognition techniques, whether human or automatic, to account for these 
        uncontrolled factors. Under more constrained or calibrated situations, 
        or as an aid for investigative purposes, judicious application of these 
        techniques may be suitable, provided they are not considered as infallible.
        At the present time, there is no scientific process that enables one to 
        uniquely characterize a person=92s voice or to identify with absolute 
        certainty an individual from his or her voice.]
        Contact Jean-Francois Bonastre for more information about the licence or
        the use of ALIZE

        Copyright (C) 2003-2010
        Laboratoire d'informatique d'Avignon [lia.univ-avignon.fr]
        ALIZE admin [alize@univ-avignon.fr]
        Jean-Francois Bonastre [jean-francois.bonastre@univ-avignon.fr]
*/

#if !defined(ALIZE_DistribGF_h)
#define ALIZE_DistribGF_h

#if defined(_WIN32)
#if defined(ALIZE_EXPORTS)
#define ALIZE_API __declspec(dllexport)
#else
#define ALIZE_API __declspec(dllimport)
#endif
#else
#define ALIZE_API
#endif

#include "Distrib.h"
#include "RealVector.h"
#include "DoubleSquareMatrix.h"

namespace alize
{
  class Config;



  class ALIZE_API DistribGF : public Distrib
  {
    friend class TestDistribGF;
    friend class TestMixtureGF;
    friend class TestMixtureGFStat;

  public :

    DistribGF(const DistribGF& d);

    explicit DistribGF(const unsigned long vectSize);

    explicit DistribGF(const Config& config);

    virtual const Distrib& operator=(const Distrib& d);
    
    const DistribGF& operator=(const DistribGF& d);

    virtual bool operator==(const Distrib& d) const;

    virtual ~DistribGF();

    virtual void reset();

    virtual lk_t computeLK(const Feature&) const;
    virtual lk_t computeLK(const Feature&, unsigned long idx) const;

    void setCov(const real_t value, const unsigned long col, const unsigned long row);

    virtual void computeAll();

    real_t getCov(const unsigned long col, const unsigned long row) const;

    real_t getCovInv(const unsigned long col, const unsigned long row) const;

    DoubleSquareMatrix& getCovMatrix();
    const DoubleSquareMatrix& getCovMatrix() const;

    DoubleSquareMatrix& getCovInvMatrix();
    const DoubleSquareMatrix& getCovInvMatrix() const;

    virtual String getClassName() const;
    virtual String toString() const;

    void setCovInv(const K&, real_t value, const unsigned long col,
                         const unsigned long row);

    static DistribGF& create(const K&, const unsigned long vectSize);

    static DistribGF& create(const K&, const Config& config);

    DistribGF& duplicate(const K&) const;

  private :

    virtual Distrib& clone() const;

    mutable DoubleSquareMatrix _covMatr;    
    DoubleSquareMatrix  _covInvMatr; 
    real_t              _cst;        
    DoubleVector        _tmpVect;

  };

} // end namespace alize

#endif // !defined(ALIZE_DistribGF_h)