LSST Applications 27.0.0,g0265f82a02+469cd937ee,g02d81e74bb+21ad69e7e1,g1470d8bcf6+cbe83ee85a,g2079a07aa2+e67c6346a6,g212a7c68fe+04a9158687,g2305ad1205+94392ce272,g295015adf3+81dd352a9d,g2bbee38e9b+469cd937ee,g337abbeb29+469cd937ee,g3939d97d7f+72a9f7b576,g487adcacf7+71499e7cba,g50ff169b8f+5929b3527e,g52b1c1532d+a6fc98d2e7,g591dd9f2cf+df404f777f,g5a732f18d5+be83d3ecdb,g64a986408d+21ad69e7e1,g858d7b2824+21ad69e7e1,g8a8a8dda67+a6fc98d2e7,g99cad8db69+f62e5b0af5,g9ddcbc5298+d4bad12328,ga1e77700b3+9c366c4306,ga8c6da7877+71e4819109,gb0e22166c9+25ba2f69a1,gb6a65358fc+469cd937ee,gbb8dafda3b+69d3c0e320,gc07e1c2157+a98bf949bb,gc120e1dc64+615ec43309,gc28159a63d+469cd937ee,gcf0d15dbbd+72a9f7b576,gdaeeff99f8+a38ce5ea23,ge6526c86ff+3a7c1ac5f1,ge79ae78c31+469cd937ee,gee10cc3b42+a6fc98d2e7,gf1cff7945b+21ad69e7e1,gfbcc870c63+9a11dc8c8f
LSST Data Management Base Package
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RandomImage.cc
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1// -*- lsst-c++ -*-
2
3/*
4 * LSST Data Management System
5 * Copyright 2008, 2009, 2010 LSST Corporation.
6 *
7 * This product includes software developed by the
8 * LSST Project (http://www.lsst.org/).
9 *
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the LSST License Statement and
21 * the GNU General Public License along with this program. If not,
22 * see <http://www.lsstcorp.org/LegalNotices/>.
23 */
24
25/*
26 * Fill Images with Random numbers
27 */
31
32namespace lsst {
33namespace afw {
34namespace math {
35
36namespace {
37
38template <typename T>
39struct do_random : public lsst::afw::image::pixelOp0<T> {
40 do_random(Random &rand) : _rand(rand) {}
41
42protected:
43 Random &_rand;
44};
45
46template <typename T>
47struct do_uniform : public do_random<T> {
48 do_uniform(Random &rand) : do_random<T>(rand) {}
49
50 T operator()() const override { return do_random<T>::_rand.uniform(); }
51};
52
53template <typename T>
54struct do_uniformPos : public do_random<T> {
55 do_uniformPos(Random &rand) : do_random<T>(rand) {}
56
57 T operator()() const override { return do_random<T>::_rand.uniformPos(); }
58};
59
60template <typename T>
61struct do_uniformInt : public do_random<T> {
62 do_uniformInt(Random &rand, unsigned long n) : do_random<T>(rand), _n(n) {}
63
64 T operator()() const override { return do_random<T>::_rand.uniformInt(_n); }
65
66private:
67 unsigned long _n;
68};
69
70template <typename T>
71struct do_flat : public do_random<T> {
72 do_flat(Random &rand, double const a, double const b) : do_random<T>(rand), _a(a), _b(b) {}
73
74 T operator()() const override { return do_random<T>::_rand.flat(_a, _b); }
75
76private:
77 double const _a;
78 double const _b;
79};
80
81template <typename T>
82struct do_gaussian : public do_random<T> {
83 do_gaussian(Random &rand) : do_random<T>(rand) {}
84
85 T operator()() const override { return do_random<T>::_rand.gaussian(); }
86};
87
88template <typename T>
89struct do_chisq : public do_random<T> {
90 do_chisq(Random &rand, double nu) : do_random<T>(rand), _nu(nu) {}
91
92 T operator()() const override { return do_random<T>::_rand.chisq(_nu); }
93
94private:
95 double const _nu;
96};
97
98template <typename T>
99struct do_poisson : public do_random<T> {
100 do_poisson(Random &rand, double mu) : do_random<T>(rand), _mu(mu) {}
101
102 T operator()() const override { return do_random<T>::_rand.poisson(_mu); }
103
104private:
105 double const _mu;
106};
107} // namespace
108
109template <typename ImageT>
110void randomUniformImage(ImageT *image, Random &rand) {
111 lsst::afw::image::for_each_pixel(*image, do_uniform<typename ImageT::Pixel>(rand));
112}
113
114template <typename ImageT>
115void randomUniformPosImage(ImageT *image, Random &rand) {
116 lsst::afw::image::for_each_pixel(*image, do_uniformPos<typename ImageT::Pixel>(rand));
117}
118
119template <typename ImageT>
120void randomUniformIntImage(ImageT *image, Random &rand, unsigned long n) {
121 lsst::afw::image::for_each_pixel(*image, do_uniformInt<typename ImageT::Pixel>(rand, n));
122}
123
124template <typename ImageT>
125void randomFlatImage(ImageT *image, Random &rand, double const a, double const b) {
126 lsst::afw::image::for_each_pixel(*image, do_flat<typename ImageT::Pixel>(rand, a, b));
127}
128
129template <typename ImageT>
130void randomGaussianImage(ImageT *image, Random &rand) {
131 lsst::afw::image::for_each_pixel(*image, do_gaussian<typename ImageT::Pixel>(rand));
132}
133
134template <typename ImageT>
135void randomChisqImage(ImageT *image, Random &rand, double const nu) {
136 lsst::afw::image::for_each_pixel(*image, do_chisq<typename ImageT::Pixel>(rand, nu));
137}
138
139template <typename ImageT>
140void randomPoissonImage(ImageT *image, Random &rand, double const mu) {
141 lsst::afw::image::for_each_pixel(*image, do_poisson<typename ImageT::Pixel>(rand, mu));
142}
143
144//
145// Explicit instantiations
146//
148#define INSTANTIATE(T) \
149 template void randomUniformImage(lsst::afw::image::Image<T> *image, Random &rand); \
150 template void randomUniformPosImage(lsst::afw::image::Image<T> *image, Random &rand); \
151 template void randomUniformIntImage(lsst::afw::image::Image<T> *image, Random &rand, unsigned long n); \
152 template void randomFlatImage(lsst::afw::image::Image<T> *image, Random &rand, double const a, \
153 double const b); \
154 template void randomGaussianImage(lsst::afw::image::Image<T> *image, Random &rand); \
155 template void randomChisqImage(lsst::afw::image::Image<T> *image, Random &rand, double const nu); \
156 template void randomPoissonImage(lsst::afw::image::Image<T> *image, Random &rand, double const mu);
157
158INSTANTIATE(double)
159INSTANTIATE(float)
161} // namespace math
162} // namespace afw
163} // namespace lsst
#define INSTANTIATE(FROMSYS, TOSYS)
Definition Detector.cc:509
Random & _rand
table::Key< int > b
A class that can be used to generate sequences of random numbers according to a number of different a...
Definition Random.h:57
void for_each_pixel(Image< LhsT > &lhs, pixelOp0< LhsT > const &func)
Set each pixel in an Image<LhsT> to func()
void randomUniformImage(ImageT *image, Random &rand)
Set image to random numbers uniformly distributed in the range [0, 1)
void randomPoissonImage(ImageT *image, Random &rand, double const mu)
Set image to random numbers with a Poisson distribution with mean mu (n.b.
void randomGaussianImage(ImageT *image, Random &rand)
Set image to random numbers with a gaussian N(0, 1) distribution.
void randomUniformPosImage(ImageT *image, Random &rand)
Set image to random numbers uniformly distributed in the range (0, 1)
void randomFlatImage(ImageT *image, Random &rand, double const a, double const b)
Set image to random numbers uniformly distributed in the range [a, b)
void randomChisqImage(ImageT *image, Random &rand, double const nu)
Set image to random numbers with a chi^2_{nu} distribution.
void randomUniformIntImage(ImageT *image, Random &rand, unsigned long n)
Set image to random integers uniformly distributed in the range 0 ... n - 1.
T rand(T... args)
A functor class equivalent to std::function<ValT ()>, but with a virtual operator()