fitGaussian.hpp

Go to the documentation of this file.

/** \file fitGaussian.hpp
 * \author Jared R. Males
 * \brief Tools for fitting Gaussians to data.
 * \ingroup fitting_files
 *
 */
 
//***********************************************************************//
// Copyright 2015, 2016, 2017 Jared R. Males (jaredmales@gmail.com)
//
// This file is part of mxlib.
//
// mxlib 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 3 of the License, or
// (at your option) any later version.
//
// mxlib 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 mxlib.  If not, see <http://www.gnu.org/licenses/>.
//***********************************************************************//
 
#ifndef fitGaussian_hpp
#define fitGaussian_hpp
 
#include "array2FitGaussian1D.hpp"
#include "array2FitGaussian2D.hpp"
 
#include "../../mxError.hpp"
#include "levmarInterface.hpp"
#include "../func/gaussian.hpp"
#include "../constants.hpp"
 
#include "../../improc/eigenImage.hpp"
 
namespace mx
{
namespace math
{
namespace fit
{
 
/** \defgroup gaussian_peak_fit Gaussians
 * \brief Fitting Gaussians to data.
 *
 * The Gaussian function is fit to data.
 *
 * \ingroup peak_fit
 */
 
// forward
template <typename _realT>
struct gaussian1D_fitter;
 
///\ref levmarInterface fitter structure for the symmetric Gaussian.
/** \ingroup gaussian_peak_fit
 *
 */
template <typename _realT>
struct gaussian1D_fitter
{
    typedef _realT realT;
 
    static const int nparams = 4;
 
    static void func( realT *p, realT *hx, int m, int n, void *adata )
    {
        array2FitGaussian1D<realT> *arr = (array2FitGaussian1D<realT> *)adata;
 
        realT G0 = arr->G0( p );
        realT G = arr->G( p );
        realT x0 = arr->x0( p );
        realT sigma = arr->sigma( p );
 
        if( arr->m_mask )
        {
            if( arr->m_coords )
            {
                for( int i = 0; i < arr->m_nx; ++i )
                {
                    if( arr->m_mask[i] == 0 )
                        continue;
                    hx[i] = func::gaussian<realT>( arr->m_coords[i], G0, G, x0, sigma ) - arr->m_data[i];
                }
            }
            else
            {
                for( int i = 0; i < arr->m_nx; ++i )
                {
                    if( arr->m_mask[i] == 0 )
                        continue;
                    hx[i] = func::gaussian<realT>( i, G0, G, x0, sigma ) - arr->m_data[i];
                }
            }
        }
        else
        {
            if( arr->m_coords )
            {
                for( int i = 0; i < arr->m_nx; ++i )
                {
                    hx[i] = func::gaussian<realT>( arr->m_coords[i], G0, G, x0, sigma ) - arr->m_data[i];
                }
            }
            else
            {
                for( int i = 0; i < arr->m_nx; ++i )
                {
                    hx[i] = func::gaussian<realT>( i, G0, G, x0, sigma ) - arr->m_data[i];
                }
            }
        }
    }
};
 
extern template struct gaussian1D_fitter<float>;
extern template struct gaussian1D_fitter<double>;
 
/// Class to manage fitting a 1D Gaussian to data via the \ref levmarInterface
/** Fits the following function to the data:
 * \f$ G(x) = G_0 + G\exp[-(0.5/\sigma^2)((x-x_0)^2)]\f$
 *
 * Can use a vector of x-coordinates, or use the array index as the position corresponding to each y-value.
 * A mask can be provided, where any 0 entries cause that position to be ignored.
 *
 * Any of the parameters can be fixed, and not included in the fit.
 *
 * \code
 *
 * \endcode
 *
 *
 * \tparam fitterT a type meeting the above requirements.
 *
 * \ingroup gaussian_peak_fit
 *
 */
// template<typename fitterT>
template <typename _realT>
class fitGaussian1D : public levmarInterface<gaussian1D_fitter<_realT>> // fitterT>
{
 
  public:
    typedef _realT realT;
    typedef gaussian1D_fitter<realT> fitterT;
 
  protected:
    array2FitGaussian1D<realT> arr;
 
    void initialize()
    {
        this->allocate_params( arr.nparams() );
        this->adata = &arr;
    }
 
  public:
    fitGaussian1D()
    {
        this->initialize();
    }
 
    ~fitGaussian1D()
    {
    }
 
    /// Set whether each parameter is fixed.
    /** Sets the parameter indices appropriately.
     */
    void setFixed( bool G0,   ///< [in] if true, then G0 will be not be part of the fit
                   bool G,    ///< [in] if true, then G will be not be part of the fit
                   bool x0,   ///< [in] if true, then x0 will be not be part of the fit
                   bool sigma ///< [in] if true, then sigma will be not be part of the fit
    )
    {
        arr.setFixed( G0, G, x0, sigma );
        this->allocate_params( arr.nparams() );
    }
 
    /// Set the initial guess for a symmetric Gaussian.
    /** Also works for the general case, setting the same width in both directions.
     */
    void setGuess( realT G0,   ///< [in] the constant background level
                   realT G,    ///< [in] the peak scaling
                   realT x0,   ///< [in] the center x-coordinate
                   realT sigma ///< [in] the width parameter
    )
    {
        arr.G0( this->p, G0 );
        arr.G( this->p, G );
        arr.x0( this->p, x0 );
        arr.sigma( this->p, sigma );
    }
 
    /// Set the data aray.
    void setArray( realT *data, int nx )
    {
        arr.m_data = data;
        arr.m_nx = nx;
 
        this->n = nx;
    }
 
    /// Set the data aray.
    void setArray( realT *data, realT *coords, int nx )
    {
        arr.m_data = data;
        arr.m_coords = coords;
        arr.m_nx = nx;
 
        this->n = nx;
    }
 
    /// Do the fit.
    int fit()
    {
        fitterT fitter;
 
        return levmarInterface<fitterT>::fit();
    }
 
    /// Get the current value of G0, the constant.
    /**
     * \returns the current value of G0, which is p[0].
     */
    realT G0()
    {
        return arr.G0( this->p );
    }
 
    /// Get the peak scaling.
    realT G()
    {
        return arr.G( this->p );
    }
 
    /// Get the center x-coordinate
    realT x0()
    {
        return arr.x0( this->p );
    }
 
    /// Return sigma
    /**
     */
    realT sigma()
    {
        return arr.sigma( this->p );
    }
};
 
extern template class fitGaussian1D<float>;
extern template class fitGaussian1D<double>;
 
/// Alias for the fitGaussian1D type fitting the gaussian.
/** \ingroup gaussian_peak_fit
 */
// template<typename realT>
// using fitGaussian1D = mx::math::fit::fitGaussian1D<mx::math::fit::gaussian1D_fitter<realT>>;
 
// forward
template <typename _realT>
struct gaussian2D_sym_fitter;
 
// forward
template <typename _realT>
struct gaussian2D_gen_fitter;
 
template <typename _realT>
struct gaussian2D_gen_fitter_bgfixed;
 
/// Class to manage fitting a 2D Gaussian to data via the \ref levmarInterface
/** Can fit either the symmetric Gaussian, or the rotated asymmetric Gaussian.  Individual parameters can be fixed,
 * except in the asymmetric case \f$\sigma_x, \sigma_y, \theta\f$ must currently be fixed together.
 *
 * In addition to the requirements on fitterT specified by \ref levmarInterface
 * this class also requires the following in fitterT
 * \code
 * static const int nparams = 7; //where the number 7 is replaced by the number of parameters that fitterT expects to
 * fit.
 *
 * void paramNormalizer( array2FitGaussian2D * arr,
 *                       realT *,
 *                       int); //A function which converts from input parameters to fitting parameters.  May do nothing.
 *
 * \endcode
 *
 *
 * \tparam fitterT a type meeting the above requirements.
 *
 * \ingroup gaussian_peak_fit
 *
 * \test Scenario: Verify direction and accuracy of various image shifts \ref tests_improc_imageTransforms_imageShift
 * "[test doc]"
 *
 */
template <typename fitterT>
class fitGaussian2D : public levmarInterface<fitterT>
{
 
  public:
    typedef typename fitterT::realT realT;
 
    array2FitGaussian2D<realT>
        arr; /**< Data array to pass to the levmar library.
                  Contains the actual data plus the parameters if fixed.*/
 
    void initialize()
    {
        if( fitterT::maxNparams == 5 )
        {
            arr.setSymmetric();
        }
        else
        {
            arr.setGeneral();
        }
        this->allocate_params( arr.nparams() );
        this->adata = &arr;
    }
 
    fitGaussian2D()
    {
        initialize();
    }
 
    ~fitGaussian2D()
    {
    }
 
    /// Set whether each parameter is fixed.
    /** Sets the parameter indices appropriately.
     */
    void setFixed( bool G0,      ///< [in] if true, then G0 will be not be part of the fit
                   bool G,       ///< [in] if true, then G will be not be part of the fit
                   bool x0,      ///< [in] if true, then x0 will be not be part of the fit
                   bool y0,      ///< [in] if true, then y0 will be not be part of the fit
                   bool sigma_x, ///< [in] if true, then sigma_x will be not be part of the fit
                   bool sigma_y, ///< [in] if true, then sigma_y will be not be part of the fit
                   bool theta    ///< [in] if true, then theta will be not be part of the fit
    )
    {
        arr.setFixed( G0, G, x0, y0, sigma_x, sigma_y, theta );
        this->allocate_params( arr.nparams() );
    }
 
    /// Set whether each parameter is fixed.
    /** Sets the parameter indices appropriately.
     */
    void setFixed( bool G0,   ///< [in] if true, then G0 will be not be part of the fit
                   bool G,    ///< [in] if true, then G will be not be part of the fit
                   bool x0,   ///< [in] if true, then x0 will be not be part of the fit
                   bool y0,   ///< [in] if true, then y0 will be not be part of the fit
                   bool sigma ///< [in] if true, then sigma will be not be part of the fit
    )
    {
        arr.setFixed( G0, G, x0, y0, sigma, sigma, sigma );
        this->allocate_params( arr.nparams() );
    }
 
    /// Set the initial guess for a symmetric Gaussian.
    /** Also works for the general case, setting the same width in both directions.
     */
    void setGuess( realT G0,   ///< [in] the constant background level
                   realT G,    ///< [in] the peak scaling
                   realT x0,   ///< [in] the center x-coordinate
                   realT y0,   ///< [in] the center y-coordinate
                   realT sigma ///< [in] the width parameter
    )
    {
        arr.G0( this->p, G0 );
        arr.G( this->p, G );
        arr.x0( this->p, x0 );
        arr.y0( this->p, y0 );
        arr.sigma( this->p, sigma );
    }
 
    /// Set the initial guess for the general Gaussian.
    void setGuess( realT G0,      ///< [in] the constant background level
                   realT G,       ///< [in] the peak scaling
                   realT x0,      ///< [in] the center x-coordinate
                   realT y0,      ///< [in] the center y-coordinate
                   realT sigma_x, ///< [in] the width parameter in the rotated x-direction (the long axis)
                   realT sigma_y, ///< [in] the width parameter in the rotated y-direction
                   realT theta    ///< [in] the angle of the long axis (always sigma_x)
    )
    {
 
        arr.G0( this->p, G0 );
        arr.G( this->p, G );
        arr.x0( this->p, x0 );
        arr.y0( this->p, y0 );
        arr.sigma_x( this->p, sigma_x );
        arr.sigma_y( this->p, sigma_y );
        arr.theta( this->p, theta );
    }
 
    /// Set the data aray.
    void setArray( realT *data, ///< [in] The 2D array of data to fit.
                   int nx,      ///< [in] the x size of the data
                   int ny       ///< [in] the y size of the data
    )
    {
        arr.data = data;
        arr.nx = nx;
        arr.ny = ny;
        arr.mask = nullptr;
        this->n = nx * ny;
    }
 
    /// Set the data aray, with a mask.
    void setArray(
        realT *data, ///< [in] The 2D array of data to fit.
        int nx,      ///< [in] the x size of the data
        int ny,      ///< [in] the y size of the data
        realT *mask  ///< [in] Array of same size as data.  Any 0 pixels in this array will be excluded from the fit.
    )
    {
        arr.data = data;
        arr.nx = nx;
        arr.ny = ny;
        arr.mask = mask;
 
        this->n = 0;
        int idx_mat;
        for( int j = 0; j < nx; ++j )
        {
            for( int i = 0; i < ny; ++i )
            {
                idx_mat = i + j * nx;
 
                this->n += arr.mask[idx_mat];
            }
        }
    }
 
    /// Do the fit.
    int fit()
    {
        fitterT fitter;
        fitter.paramNormalizer( &arr, this->p, 1 );
 
        levmarInterface<fitterT>::fit();
 
        fitter.paramNormalizer( &arr, this->p, -1 );
        fitter.paramNormalizer(
            &arr, this->init_p, -1 ); // The normalized version is stored, so fix it before possible output.
 
        return 0;
    }
 
    /// Get the current value of G0, the constant.
    /**
     * \returns the current value of G0.
     */
    realT G0()
    {
        return arr.G0( this->p );
    }
 
    /// Get the peak scaling.
    realT G()
    {
        return arr.G( this->p );
    }
 
    /// Get the center x-coordinate
    realT x0()
    {
        return arr.x0( this->p );
    }
 
    /// Get the center y-coordinate
    realT y0()
    {
        return arr.y0( this->p );
    }
 
    /// Return the width parameter
    /** As described for the symmetric Gaussian.
     *
     * For the general Gaussian, this returns \f$ \sigma = \sqrt{ \sigma_x^2 + \sigma_y^2} \f$.
     */
    realT sigma()
    {
        return arr.sigma( this->p );
    }
 
    /// Return the full-width at half maximum
    /** This is a simple scaling of the sigma() result
     */
    realT fwhm()
    {
        return func::sigma2fwhm( arr.sigma( this->p ) );
    }
 
    /// Return the width parameter on the long axis.
    realT sigma_x()
    {
        return arr.sigma_x( this->p );
    }
 
    /// Return the width parameter on the short axis.
    realT sigma_y()
    {
        return arr.sigma_y( this->p );
    }
 
    /// Return the orientation of the long axis.
    realT theta()
    {
        return arr.theta( this->p );
    }
};
 
///\ref levmarInterface fitter structure for the symmetric Gaussian.
/** \ingroup gaussian_peak_fit
 *
 * \test Scenario: Verify direction and accuracy of various image shifts \ref tests_improc_imageTransforms_imageShift
 * "[test doc]"
 */
template <typename _realT>
struct gaussian2D_sym_fitter
{
    typedef _realT realT;
 
    static const int maxNparams = 5;
 
    static void func( realT *p, realT *hx, int m, int n, void *adata )
    {
        array2Fit<realT> *arr = (array2Fit<realT> *)adata;
 
        size_t idx_mat, idx_dat;
 
        idx_dat = 0;
 
        for( int j = 0; j < arr->ny; j++ )
        {
            for( int i = 0; i < arr->nx; i++ )
            {
                idx_mat = i + j * arr->nx;
 
                hx[idx_dat] = func::gaussian2D<realT>( i, j, p[0], p[1], p[2], p[3], p[4] ) - arr->data[idx_mat];
 
                idx_dat++;
            }
        }
    }
 
    /// Does nothing in this case.
    void paramNormalizer( array2FitGaussian2D<realT> *arr, realT *p, int dir )
    {
        return;
    }
};
 
///\ref levmarInterface fitter structure for the general elliptical Gaussian.
/** \ingroup gaussian_peak_fit
 *
 */
template <typename _realT>
struct gaussian2D_gen_fitter
{
    typedef _realT realT;
 
    static const int maxNparams = 7;
 
    static void func( realT *p, realT *hx, int m, int n, void *adata )
    {
        array2FitGaussian2D<realT> *arr = (array2FitGaussian2D<realT> *)adata;
 
        size_t idx_mat, idx_dat;
 
        realT G0 = arr->G0( p ); // 0
        realT G = arr->G( p );   // 1
        realT x0 = arr->x0( p ); // 2
        realT y0 = arr->y0( p ); // 3
        realT a = arr->a( p );   // 4
        realT b = arr->b( p );   // 5
        realT c = arr->c( p );   // 6
 
        // Check for positive-definiteness of {{a b}{b c}}
        if( a * c - b * b <= 0 || a <= 0 || c <= 0 || a + c <= 2 * fabs( b ) )
        {
            idx_dat = 0;
            // If it's not positive-definite, then we just fill in with the value of the image itself.
            if( arr->mask == nullptr )
            {
                if( arr->weights == nullptr)
                {
                    for( int j = 0; j < arr->ny; ++j )
                    {
                        for( int i = 0; i < arr->ny; ++i )
                        {
                            idx_mat = i + j * arr->nx;
                            hx[idx_dat] = arr->data[idx_mat];
                            ++idx_dat;
                        }
                    }
                }
                else
                {
                    for( int j = 0; j < arr->ny; ++j )
                    {
                        for( int i = 0; i < arr->ny; ++i )
                        {
                            idx_mat = i + j * arr->nx;
                            hx[idx_dat] = arr->data[idx_mat] * arr->weights[idx_mat];
                            ++idx_dat;
                        }
                    }
                }
            }
            else
            {
                for( int j = 0; j < arr->ny; ++j )
                {
                    for( int i = 0; i < arr->ny; ++i )
                    {
                        idx_mat = i + j * arr->nx;
                        if( arr->mask[idx_mat] == 0 )
                        {
                            continue;
                        }
                        hx[idx_dat] = arr->data[idx_mat];
                        ++idx_dat;
                    }
                }
            }
            return;
        }
 
        // If positive-definite, now actually calculate
        idx_dat = 0;
 
        if( arr->mask == nullptr )
        {
            if(arr->weights == nullptr)
            {
                for( int j = 0; j < arr->ny; ++j )
                {
                    for( int i = 0; i < arr->nx; ++i )
                    {
                        idx_mat = i + j * arr->nx;
 
                        hx[idx_dat] = func::gaussian2D<realT>( i, j, G0, G, x0, y0, a, b, c ) - arr->data[idx_mat];
 
                        ++idx_dat;
                    }
                }
            }
            else
            {
                for( int j = 0; j < arr->ny; ++j )
                {
                    for( int i = 0; i < arr->nx; ++i )
                    {
                        idx_mat = i + j * arr->nx;
 
                        hx[idx_dat] = (func::gaussian2D<realT>( i, j, G0, G, x0, y0, a, b, c ) - arr->data[idx_mat])*arr->weights[idx_mat];
 
                        ++idx_dat;
                    }
                }
            }
        }
        else
        {
            for( int j = 0; j < arr->ny; ++j )
            {
                for( int i = 0; i < arr->nx; ++i )
                {
                    idx_mat = i + j * arr->nx;
 
                    if( arr->mask[idx_mat] == 0 )
                    {
                        continue;
                    }
                    else
                    {
                        hx[idx_dat] = func::gaussian2D<realT>( i, j, G0, G, x0, y0, a, b, c ) - arr->data[idx_mat];
 
                        ++idx_dat;
                    }
                }
            }
        }
    }
 
    void paramNormalizer( array2FitGaussian2D<realT> *arr, realT *p, int dir )
    {
        // Prepare for fit
        if( dir == 1 )
        {
            realT na, nb, nc;
            realT sx = arr->sigma_x( p );
            realT sy = arr->sigma_y( p );
            realT th = arr->theta( p );
 
            func::gaussian2D_rot2gen( na, nb, nc, sx, sy, th );
            arr->a( p, na );
            arr->b( p, nb );
            arr->c( p, nc );
            return;
        }
 
        // Convert after fit
        if( dir == -1 )
        {
            realT sx, sy, th;
            realT na = arr->a( p );
            realT nb = arr->b( p );
            realT nc = arr->c( p );
            func::gaussian2D_gen2rot( sx, sy, th, na, nb, nc );
 
            arr->sigma_x( p, sx );
            arr->sigma_y( p, sy );
            arr->theta( p, th );
            return;
        }
    }
};
 
extern template class fitGaussian2D<mx::math::fit::gaussian2D_sym_fitter<float>>;
extern template class fitGaussian2D<mx::math::fit::gaussian2D_sym_fitter<double>>;
extern template class fitGaussian2D<mx::math::fit::gaussian2D_gen_fitter<float>>;
extern template class fitGaussian2D<mx::math::fit::gaussian2D_gen_fitter<double>>;
 
/// Alias for the fitGaussian2D type fitting the symmetric gaussian.
/** \ingroup gaussian_peak_fit
 */
template <typename realT>
using fitGaussian2Dsym = fitGaussian2D<mx::math::fit::gaussian2D_sym_fitter<realT>>;
 
/// Alias for the fitGaussian2D type fitting the general elliptical gaussian.
/** \ingroup gaussian_peak_fit
 */
template <typename realT>
using fitGaussian2Dgen = fitGaussian2D<mx::math::fit::gaussian2D_gen_fitter<realT>>;
 
/// Form an estimate of the parameters of an elliptical Gaussian from a 2D image.
/** Note that this assumes that there is no constant value (i.e. it is zero-ed).
 *
 *  \ingroup gaussian_peak_fit
 */
template <typename realT>
int guessGauss2D_ang( realT &Ag,                         ///< [out] estimate of the peak
                      realT &xg,                         ///< [out] estimate of the x-coordinate of the peak
                      realT &yg,                         ///< [out] estimate of the y-coordinate of the peak
                      realT &xFWHM,                      ///< [out] estimate of the x-FWHM
                      realT &yFWHM,                      ///< [out] estimate of the y-FWHM
                      realT &angG,                       ///< [out] estimate of the angle of the ellipse
                      mx::improc::eigenImage<realT> &im, ///< [in] the image with an elliptical gaussian
                      realT maxWidth,                    ///< [in] the width of the box to search for the maximum
                      realT widthWidth,                  ///< [in] the radius of the circle to search for the widths
                      realT nAngs, ///< [in] the number of angles at which to search for the widths
                      realT xg0,   ///< [in] an initial guess at the x-coordinate of the peak
                      realT yg0    ///< [in] an initial guess at the y-coordinate of the peak
)
{
    xg = xg0;
    yg = yg0;
    Ag = im( (int)xg, (int)yg );
    for( int i = 0; i < 2 * maxWidth + 1; ++i )
    {
        for( int j = 0; j < 2 * maxWidth + 1; ++j )
        {
            if( im( (int)( xg0 - maxWidth + i ), (int)( yg0 - maxWidth + j ) ) > Ag )
            {
                Ag = im( (int)( xg0 - maxWidth + i ), (int)( yg0 - maxWidth + j ) );
                xg = xg0 - maxWidth + i;
                yg = yg0 - maxWidth + j;
            }
        }
    }
 
    realT dAng = math::two_pi<realT>() / nAngs;
    // std::vector<realT> dist(nAngs);
 
    realT c, s;
 
    realT maxD = 0;
    int maxDidx = 0;
    realT minD = widthWidth;
    int minDidx = 0;
 
    for( int i = 0; i < nAngs; ++i )
    {
        c = cos( i * dAng );
        s = sin( i * dAng );
 
        for( int j = 0; j < widthWidth; ++j )
        {
            if( im( (int)( xg + j * c ), (int)( yg + j * s ) ) <= 0.5 * Ag )
            {
                // dist[i] = j;
 
                if( j > maxD )
                {
                    maxD = j;
                    maxDidx = i;
                }
 
                if( j < minD )
                {
                    minD = j;
                    minDidx = i;
                }
                break;
            }
        }
    }
 
    // Take minang and move it by 90 degrees
    realT minang = fmod( minDidx * dAng - 0.5 * math::pi<realT>(), math::pi<realT>() );
    if( minang < 0 )
        minang = fmod( minang + math::two_pi<realT>(), math::pi<realT>() );
 
    realT maxang = fmod( maxDidx * dAng, math::pi<realT>() );
 
    // Now average
    angG = 0.5 * ( minang + maxang );
 
    xFWHM = 2 * maxD;
    yFWHM = 2 * minD;
 
    return 0; ///\returns 0 if successful
}
 
extern template int guessGauss2D_ang<float>( float &Ag,
                                             float &xg,
                                             float &yg,
                                             float &xFWHM,
                                             float &yFWHM,
                                             float &angG,
                                             mx::improc::eigenImage<float> &im,
                                             float maxWidth,
                                             float widthWidth,
                                             float nAngs,
                                             float xg0,
                                             float yg0 );
 
extern template int guessGauss2D_ang<double>( double &Ag,
                                              double &xg,
                                              double &yg,
                                              double &xFWHM,
                                              double &yFWHM,
                                              double &angG,
                                              mx::improc::eigenImage<double> &im,
                                              double maxWidth,
                                              double widthWidth,
                                              double nAngs,
                                              double xg0,
                                              double yg0 );
 
} // namespace fit
} // namespace math
 
} // namespace mx
 
#endif // fitGaussian_hpp