fourier_projection.h

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/***************************************************************************
 *
 * Authors:     Carlos Oscar S. Sorzano (coss@cnb.csic.es)
 *
 * Unidad de  Bioinformatica of Centro Nacional de Biotecnologia , CSIC
 *
 * 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  USAcd ..
 *  All comments concerning this program package may be sent to the
 *  e-mail address 'xmipp@cnb.csic.es'
 ***************************************************************************/

#ifndef _CORE_FOURIER_FOURIER_PROJECTION_H
#define _CORE_FOURIER_FOURIER_PROJECTION_H

#include "core/matrix2d.h"
#include "core/xmipp_fftw.h"
#include "core/xmipp_image.h"




class Projection: public Image<double>
{
public:
    Matrix1D< double > direction;

    Matrix2D< double > euler;

    Matrix2D< double > eulert;

    void reset(int Ydim, int Xdim);

    void setAngles(double _rot, double _tilt, double _psi);

    void read(const FileName& fn, const bool only_apply_shifts = false,
              DataMode datamode = DATA, MDRow * row = nullptr);

    void assign(const Projection& P);
};

class FourierProjector
{
public:
    double paddingFactor;
    double maxFrequency;
    double BSplineDeg;

public:
    // Auxiliary FFT transformer
    FourierTransformer transformer2D;

    // Volume to project
    MultidimArray<double> *volume;

    // Real and imaginary B-spline coefficients for Fourier of the volume
    MultidimArray< double > VfourierRealCoefs;
    MultidimArray< double > VfourierImagCoefs;

    // Projection in Fourier space
    MultidimArray< std::complex<double> > projectionFourier;

    // Projection in real space
    Image<double> projection;

    // Phase shift image
    MultidimArray<double> phaseShiftImgB;
    MultidimArray<double> phaseShiftImgA;

    // Original volume size
    int volumeSize;

    // Volume padded size
    int volumePaddedSize;

    // Euler matrix
    Matrix2D<double> E;
public:
    /* Empty constructor */
    FourierProjector(double paddFactor, double maxFreq, int degree);

    /*
     * The constructor of the class
     */
    FourierProjector(MultidimArray<double> &V, double paddFactor, double maxFreq, int BSplinedegree);

    void project(double rot, double tilt, double psi, const MultidimArray<double> *ctf=nullptr);

    void updateVolume(MultidimArray<double> &V);
public:
    void produceSideInfo();

    void produceSideInfoProjection();
};

/*
 * This function gets an object form the FourierProjection class and makes the desired projection in Fourier space
 */
void projectVolume(FourierProjector &projector, Projection &P, int Ydim, int Xdim,
                   double rot, double tilt, double psi, const MultidimArray<double> *ctf=nullptr);


#endif