VeresModel.h

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// -*- lsst-c++ -*-
/*
 * This file is part of meas_extensions_trailedSources.
 *
 * Developed for the LSST Data Management System.
 * This product includes software developed by the LSST Project
 * (https://www.lsst.org).
 * See the COPYRIGHT file at the top-level directory of this distribution
 * for details of code ownership.
 *
 * 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 3 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, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef LSST_MEAS_EXTENSIONS_TRAILEDSOURCES_VERES_MODEL_H
#define LSST_MEAS_EXTENSIONS_TRAILEDSOURCES_VERES_MODEL_H
 
#include "ndarray.h"
 
#include "lsst/geom.h"
#include "lsst/pex/config.h"
#include "lsst/afw/image.h"
#include "lsst/afw/geom.h"
 
namespace lsst {
namespace meas {
namespace extensions {
namespace trailedSources {

class VeresModel final {
public:
    using ImageF = afw::image::Image<float>;
    using ExposureF = afw::image::Exposure<float>;

    explicit VeresModel(ExposureF const& data);
 
    VeresModel(VeresModel const &) = default;
    VeresModel(VeresModel &&) = default;
    VeresModel & operator=(VeresModel const &) = default;
    VeresModel & operator=(VeresModel &&) = default;
    ~VeresModel() = default;

    double operator()(std::vector<double> const& params) const;

    std::vector<double> gradient(std::vector<double> const& params) const;

    std::tuple<double, std::vector<double>> computeFluxWithGradient(std::vector<double> const& params) const;

    std::shared_ptr<ImageF> computeModelImage(std::vector<double> const& params) const;

    double getSigma() const noexcept { return _sigma; }
 
private:
    double _computeModel(double x, double y, double xc, double yc,
                         double flux, double length, double theta) const noexcept;

    std::array<double, 5> _computeGradient(double x, double y, double xc, double yc,
                         double flux, double length, double theta) const noexcept;
 
    double _sigma;           // PSF sigma
    lsst::geom::Box2I _bbox; // Data bounding box
    ImageF::Array _data;     // Image array of exposure
    ImageF::Array _variance; // Variance array of exposure
};
 
}}}} // lsst::meas::extensions::trailedSources
 
#endif // LSST_MEAS_EXTENSIONS_TRAILEDSOURCES_VERES_MODEL_H