Correlation.h

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/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#ifndef CORRELATION_H
#define CORRELATION_H
 
#include "fftw3.h"

class Correlation
{
public:
  Correlation(int N);
  ~Correlation();

  void correlateWithShift (int N,
                           const double function1 [],
                           const double function2 [],
                           int &binStartMax,
                           double &corrMax,
                           double correlations []) const;

  void correlateWithoutShift (int N,
                              const double function1 [],
                              const double function2 [],
                              double &corrMax) const;
 
private:
  Correlation();
 
  int m_N;
 
  fftw_complex *m_signalA;
  fftw_complex *m_signalB;
  fftw_complex *m_outShifted;
  fftw_complex *m_outA;
  fftw_complex *m_outB;
  fftw_complex *m_out;
 
  fftw_plan m_planA;
  fftw_plan m_planB;
  fftw_plan m_planX;
};
 
#endif // CORRELATION_H