lsst.afw  tickets.DM-23835-g31c64b24f1
SipApproximation.h
Go to the documentation of this file.
1 // -*- lsst-c++ -*-
2 /*
3  * Developed for the LSST Data Management System.
4  * This product includes software developed by the LSST Project
5  * (https://www.lsst.org).
6  * See the COPYRIGHT file at the top-level directory of this distribution
7  * for details of code ownership.
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 GNU General Public License
20  * along with this program. If not, see <https://www.gnu.org/licenses/>.
21  */
22 
23 #ifndef LSST_AFW_GEOM_SipApproximation_h_INCLUDED
24 #define LSST_AFW_GEOM_SipApproximation_h_INCLUDED
25 
26 #include <memory>
27 #include <vector>
28 
29 #include "Eigen/Core"
30 
32 #include "lsst/afw/geom/Box.h"
34 
35 namespace lsst { namespace afw { namespace geom {
36 
94 class SipApproximation final {
95 public:
96 
129  Point2D const & crpix,
130  Eigen::Matrix2d const & cd,
131  Box2D const & bbox,
132  Extent2I const & gridShape,
133  int order,
134  bool useInverse=true,
135  double svdThreshold=-1
136  );
137 
178  Point2D const & crpix,
179  Eigen::Matrix2d const & cd,
180  Box2D const & bbox,
181  Extent2I const & gridShape,
182  ndarray::Array<double const, 2> const & a,
183  ndarray::Array<double const, 2> const & b,
184  ndarray::Array<double const, 2> const & ap,
185  ndarray::Array<double const, 2> const & bp,
186  bool useInverse=true
187  );
188 
189  // No copies just because they'd be a pain to implement and probably aren't necessary
190  SipApproximation(SipApproximation const &) = delete;
191  SipApproximation & operator=(SipApproximation const &) = delete;
192 
193  // Moves are fine.
194  SipApproximation(SipApproximation &&) noexcept = default;
195  SipApproximation & operator=(SipApproximation &&) noexcept = default;
196 
197  // Needs to be defined in .cc, where compiler can see the definitions of forward-declared
198  // private implementation classes.
199  ~SipApproximation() noexcept;
200 
202  int getOrder() const noexcept;
203 
211  double getA(int p, int q) const;
212 
220  double getB(int p, int q) const;
221 
229  double getAP(int p, int q) const;
230 
238  double getBP(int p, int q) const;
239 
241  Eigen::MatrixXd getA() const noexcept;
242 
244  Eigen::MatrixXd getB() const noexcept;
245 
247  Eigen::MatrixXd getAP() const noexcept;
248 
250  Eigen::MatrixXd getBP() const noexcept;
251 
259  Point2D applyForward(Point2D const & pix) const;
260 
267 
275  Point2D applyInverse(Point2D const & iwcs) const;
276 
283 
285  Extent2D getGridStep() const noexcept;
286 
288  Extent2I getGridShape() const noexcept;
289 
291  Box2D getBBox() const noexcept { return _bbox; }
292 
294  Point2D getPixelOrigin() const noexcept { return Point2D(_crpix); }
295 
297  Eigen::Matrix2d getCdMatrix() const noexcept { return _cdInv.inverted().getMatrix(); }
298 
311  void updateGrid(Extent2I const & shape);
312 
321  void refineGrid(int factor=2);
322 
338  void fit(int order, double svdThreshold=-1);
339 
353 
354 private:
355 
356  struct Grid;
357  struct Solution;
358 
359  bool _useInverse;
360  std::shared_ptr<TransformPoint2ToPoint2> _pixelToIwc;
361  Box2D _bbox;
362  Extent2D _crpix;
363  LinearTransform _cdInv;
364  std::unique_ptr<Grid const> _grid;
365  std::unique_ptr<Solution const> _solution;
366 };
367 
368 }}} // namespace lsst::afw::geom
369 
370 #endif // !LSST_AFW_GEOM_SipApproximation_h_INCLUDED
lsst::afw::geom::SipApproximation::getA
Eigen::MatrixXd getA() const noexcept
Return the coefficients of the forward transform polynomial.
Definition: SipApproximation.cc:293
lsst::afw::geom::SipApproximation::refineGrid
void refineGrid(int factor=2)
Update the grid by making it finer by a given integer factor.
Definition: SipApproximation.cc:366
lsst::afw::geom::SipApproximation::SipApproximation
SipApproximation(std::shared_ptr< TransformPoint2ToPoint2 > pixelToIwc, Point2D const &crpix, Eigen::Matrix2d const &cd, Box2D const &bbox, Extent2I const &gridShape, int order, bool useInverse=true, double svdThreshold=-1)
Construct a new approximation by fitting on a grid of points.
Definition: SipApproximation.cc:209
lsst::afw::geom::SipApproximation::operator=
SipApproximation & operator=(SipApproximation const &)=delete
lsst::afw::geom::SipApproximation
A fitter and results class for approximating a general Transform in a form compatible with FITS WCS p...
Definition: SipApproximation.h:94
std::shared_ptr
STL class.
lsst::afw::geom::SipApproximation::getCdMatrix
Eigen::Matrix2d getCdMatrix() const noexcept
Return the CD matrix of the WCS being approximated.
Definition: SipApproximation.h:297
lsst::afw::geom::Transform
Transform LSST spatial data, such as lsst::geom::Point2D and lsst::geom::SpherePoint,...
Definition: Transform.h:67
std::pair< double, double >
std::vector
STL class.
lsst::geom::LinearTransform
lsst::afw::geom::SipApproximation::getGridStep
Extent2D getGridStep() const noexcept
Return the distance between grid points in pixels.
Definition: SipApproximation.cc:353
lsst::afw::geom::SipApproximation::applyInverse
Point2D applyInverse(Point2D const &iwcs) const
Convert a point from intermediate world coordinates to pixels.
Definition: SipApproximation.cc:338
lsst::afw::geom::SipApproximation::fit
void fit(int order, double svdThreshold=-1)
Obtain a new solution at the given order with the current grid.
Definition: SipApproximation.cc:374
lsst::afw::geom::SipApproximation::getPixelOrigin
Point2D getPixelOrigin() const noexcept
Return the pixel origin of the WCS being approximated.
Definition: SipApproximation.h:294
lsst::afw::geom::SipApproximation::updateGrid
void updateGrid(Extent2I const &shape)
Update the grid to the given number of points in x and y.
Definition: SipApproximation.cc:362
lsst::afw::geom::SipApproximation::getOrder
int getOrder() const noexcept
Return the polynomial order of the current solution (same for forward and reverse).
Definition: SipApproximation.cc:258
Box.h
lsst::afw::geom::SipApproximation::getBBox
Box2D getBBox() const noexcept
Return the pixel-coordinate bounding box over which the approximation should be valid.
Definition: SipApproximation.h:291
lsst::afw::geom::SipApproximation::getAP
Eigen::MatrixXd getAP() const noexcept
Return the coefficients of the reverse transform polynomial.
Definition: SipApproximation.cc:307
crpix
table::PointKey< double > crpix
Definition: OldWcs.cc:131
LinearTransform.h
cd
table::Key< table::Array< double > > cd
Definition: OldWcs.cc:132
lsst::geom::LinearTransform::getMatrix
Matrix const & getMatrix() const noexcept
b
table::Key< int > b
Definition: TransmissionCurve.cc:467
lsst
A base class for image defects.
lsst::afw::geom::SipApproximation::getBP
Eigen::MatrixXd getBP() const noexcept
Return the coefficients of the reverse transform polynomial.
Definition: SipApproximation.cc:314
Transform.h
a
table::Key< int > a
Definition: TransmissionCurve.cc:466
lsst::geom::LinearTransform::inverted
const LinearTransform inverted() const
std
STL namespace.
Point< double, 2 >
lsst::afw::geom::SipApproximation::computeMaxDeviation
std::pair< double, double > computeMaxDeviation() const noexcept
Return the maximum deviation of the solution from the exact transform on the current grid.
Definition: SipApproximation.cc:378
lsst::afw::geom::SipApproximation::applyForward
Point2D applyForward(Point2D const &pix) const
Convert a point from pixels to intermediate world coordinates.
Definition: SipApproximation.cc:321
lsst::afw::geom::SipApproximation::getB
Eigen::MatrixXd getB() const noexcept
Return the coefficients of the forward transform polynomial.
Definition: SipApproximation.cc:300
lsst::geom::Box2D
lsst::afw::geom::SipApproximation::getGridShape
Extent2I getGridShape() const noexcept
Return the number of grid points in x and y.
Definition: SipApproximation.cc:358
lsst::afw::geom.Point2D
Point2D
Definition: __init__.py:89
lsst::afw::geom::SipApproximation::~SipApproximation
~SipApproximation() noexcept
Definition: SipApproximation.cc:256
Extent< int, 2 >
bbox
AmpInfoBoxKey bbox
Definition: Amplifier.cc:117