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LSST Data Management Base Package
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DoubleGaussianPsf.cc
Go to the documentation of this file.
1// -*- LSST-C++ -*-
2/*
3 * LSST Data Management System
4 * Copyright 2008-2013 LSST Corporation.
5 *
6 * This product includes software developed by the
7 * LSST Project (http://www.lsst.org/).
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the LSST License Statement and
20 * the GNU General Public License along with this program. If not,
21 * see <http://www.lsstcorp.org/LegalNotices/>.
22 */
23
24#include <cmath>
25
26#include "lsst/pex/exceptions.h"
35
36namespace lsst {
37namespace afw {
38namespace table {
39namespace io {
40
41template std::shared_ptr<meas::algorithms::DoubleGaussianPsf>
43
44} // namespace io
45} // namespace table
46} // namespace afw
47namespace meas {
48namespace algorithms {
49
50namespace {
51
52// Read-only singleton struct containing the schema and keys that a double-Gaussian Psf is mapped
53// to in record persistence.
54struct DoubleGaussianPsfPersistenceHelper {
60
61 static DoubleGaussianPsfPersistenceHelper const& get() {
62 static DoubleGaussianPsfPersistenceHelper instance;
63 return instance;
64 }
65
66 // No copying
67 DoubleGaussianPsfPersistenceHelper(const DoubleGaussianPsfPersistenceHelper&) = delete;
68 DoubleGaussianPsfPersistenceHelper& operator=(const DoubleGaussianPsfPersistenceHelper&) = delete;
69
70 // No moving
71 DoubleGaussianPsfPersistenceHelper(DoubleGaussianPsfPersistenceHelper&&) = delete;
72 DoubleGaussianPsfPersistenceHelper& operator=(DoubleGaussianPsfPersistenceHelper&&) = delete;
73
74private:
75 DoubleGaussianPsfPersistenceHelper()
76 : schema(),
77 dimensions(afw::table::PointKey<int>::addFields(schema, "dimensions", "width/height of kernel",
78 "pixel")),
79 sigma1(schema.addField<double>("sigma1", "radius of inner Gaussian", "pixel")),
80 sigma2(schema.addField<double>("sigma2", "radius of outer Gaussian", "pixel")),
81 b(schema.addField<double>("b", "central amplitude of outer Gaussian (inner amplitude == 1)")) {}
82};
83
84class DoubleGaussianPsfFactory : public afw::table::io::PersistableFactory {
85public:
86 virtual std::shared_ptr<afw::table::io::Persistable>
87 read(InputArchive const& archive, CatalogVector const& catalogs) const {
88 static DoubleGaussianPsfPersistenceHelper const& keys = DoubleGaussianPsfPersistenceHelper::get();
89 LSST_ARCHIVE_ASSERT(catalogs.size() == 1u);
90 LSST_ARCHIVE_ASSERT(catalogs.front().size() == 1u);
91 afw::table::BaseRecord const& record = catalogs.front().front();
92 LSST_ARCHIVE_ASSERT(record.getSchema() == keys.schema);
94 record.get(keys.dimensions.getX()), record.get(keys.dimensions.getY()),
95 record.get(keys.sigma1), record.get(keys.sigma2), record.get(keys.b));
96 }
97
98 DoubleGaussianPsfFactory(std::string const& name) : afw::table::io::PersistableFactory(name) {}
99};
100
101// Helper function for ctor: need to construct the kernel to pass to KernelPsf, because we
102// can't change it after construction.
103std::shared_ptr<afw::math::Kernel>
104makeDoubleGaussianKernel(int width, int height, double sigma1, double& sigma2, double b) {
105 if (b == 0.0 && sigma2 == 0.0) {
106 sigma2 = 1.0; // avoid 0/0 at centre of Psf
107 }
108 if (sigma1 <= 0 || sigma2 <= 0) {
110 (boost::format("sigma may not be 0: %g, %g") % sigma1 % sigma2).str());
111 }
112 afw::math::DoubleGaussianFunction2<double> dg(sigma1, sigma2, b);
113 std::shared_ptr<afw::math::Kernel> kernel(new afw::math::AnalyticKernel(width, height, dg));
114 return kernel;
115}
116
117std::string getDoubleGaussianPsfPersistenceName() { return "DoubleGaussianPsf"; }
118
119DoubleGaussianPsfFactory registration(getDoubleGaussianPsfPersistenceName());
120
121} // namespace
122
123DoubleGaussianPsf::DoubleGaussianPsf(int width, int height, double sigma1, double sigma2, double b)
124 : KernelPsf(makeDoubleGaussianKernel(width, height, sigma1, sigma2, b)),
125 _sigma1(sigma1),
126 _sigma2(sigma2),
127 _b(b) {}
128
130 return std::make_shared<DoubleGaussianPsf>(getKernel()->getWidth(), getKernel()->getHeight(), _sigma1,
131 _sigma2, _b);
132}
133
135 return std::make_shared<DoubleGaussianPsf>(width, height, _sigma1, _sigma2, _b);
136}
137
138std::string DoubleGaussianPsf::getPersistenceName() const { return getDoubleGaussianPsfPersistenceName(); }
139
141 static DoubleGaussianPsfPersistenceHelper const& keys = DoubleGaussianPsfPersistenceHelper::get();
142 afw::table::BaseCatalog catalog = handle.makeCatalog(keys.schema);
143 std::shared_ptr<afw::table::BaseRecord> record = catalog.addNew();
144 (*record).set(keys.dimensions.getX(), getKernel()->getWidth());
145 (*record).set(keys.dimensions.getY(), getKernel()->getHeight());
146 (*record).set(keys.sigma1, getSigma1());
147 (*record).set(keys.sigma2, getSigma2());
148 (*record).set(keys.b, getB());
149 handle.saveCatalog(catalog);
150}
151
152} // namespace algorithms
153} // namespace meas
154} // namespace lsst
155
156namespace lsst {
157namespace afw {
158namespace detection {
159
160} // namespace detection
161} // namespace afw
162} // namespace lsst
#define LSST_EXCEPT(type,...)
Create an exception with a given type.
Definition Exception.h:48
#define LSST_ARCHIVE_ASSERT(EXPR)
An assertion macro used to validate the structure of an InputArchive.
Definition Persistable.h:48
A kernel described by a function.
Definition Kernel.h:535
double Guassian (sum of two Gaussians)
Base class for all records.
Definition BaseRecord.h:31
A class used as a handle to a particular field in a table.
Definition Key.h:53
A FunctorKey used to get or set a lsst::geom::Point from an (x,y) pair of int or double Keys.
Definition aggregates.h:51
Defines the fields and offsets for a table.
Definition Schema.h:51
void saveCatalog(BaseCatalog const &catalog)
Save a catalog in the archive.
BaseCatalog makeCatalog(Schema const &schema)
Return a new, empty catalog with the given schema.
static std::shared_ptr< T > dynamicCast(std::shared_ptr< Persistable > const &ptr)
Dynamically cast a shared_ptr.
A base class for factory classes used to reconstruct objects from records.
io::OutputArchiveHandle OutputArchiveHandle
std::string getPersistenceName() const override
Return the unique name used to persist this object and look up its factory.
void write(OutputArchiveHandle &handle) const override
Write the object to one or more catalogs.
double getSigma1() const
Return the radius of the inner Gaussian.
DoubleGaussianPsf(int width, int height, double sigma1, double sigma2=0.0, double b=0.0)
Constructor for a DoubleGaussianPsf.
double getSigma2() const
Return the radius of the outer Gaussian.
std::shared_ptr< afw::detection::Psf > clone() const override
Polymorphic deep copy. Usually unnecessary, as Psfs are immutable.
double getB() const
Return the ratio of Gaussian peak amplitudes: outer/inner.
std::shared_ptr< afw::detection::Psf > resized(int width, int height) const override
Return a clone with specified kernel dimensions.
KernelPsf(afw::math::Kernel const &kernel, geom::Point2D const &averagePosition=geom::Point2D())
Construct a KernelPsf with a clone of the given kernel.
Definition KernelPsf.cc:33
std::shared_ptr< afw::math::Kernel const > getKernel() const
Return the Kernel used to define this Psf.
Definition KernelPsf.h:52
Reports arguments outside the domain of an operation.
Definition Runtime.h:57
T make_shared(T... args)
CatalogT< BaseRecord > BaseCatalog
Definition fwd.h:72
std::shared_ptr< table::io::Persistable > read(table::io::InputArchive const &archive, table::io::CatalogVector const &catalogs) const override