lsst::meas::astrom::ScaledPolynomialTransform Class Reference

A 2-d coordinate transform represented by a lazy composition of an AffineTransform, a PolynomialTransform, and another AffineTransform. More...

#include <PolynomialTransform.h>

Public Member Functions
	ScaledPolynomialTransform (PolynomialTransform const &poly, geom::AffineTransform const &inputScaling, geom::AffineTransform const &outputScalingInverse)
	Construct a new ScaledPolynomialTransform from its constituents. More...
	ScaledPolynomialTransform (ScaledPolynomialTransform const &other)=default
	ScaledPolynomialTransform (ScaledPolynomialTransform &&other)=default
ScaledPolynomialTransform &	operator= (ScaledPolynomialTransform const &other)=default
ScaledPolynomialTransform &	operator= (ScaledPolynomialTransform &&other)=default
void	swap (ScaledPolynomialTransform &other)
PolynomialTransform const &	getPoly () const
	Return the polynomial transform applied after the input scaling. More...
geom::AffineTransform const &	getInputScaling () const
	Return the first affine transform applied to input points. More...
geom::AffineTransform const &	getOutputScalingInverse () const
	Return the affine transform applied to points after the polynomial transform. More...
geom::AffineTransform	linearize (geom::Point2D const &in) const
	Return an approximate affine transform at the given point. More...
geom::Point2D	operator() (geom::Point2D const &in) const
	Apply the transform to a point. More...

Static Public Member Functions
static ScaledPolynomialTransform	convert (PolynomialTransform const &poly)
	Convert a PolynomialTransform to an equivalent ScaledPolynomialTransform. More...
static ScaledPolynomialTransform	convert (SipForwardTransform const &sipForward)
	Convert a SipForwardTransform to an equivalent ScaledPolynomialTransform. More...
static ScaledPolynomialTransform	convert (SipReverseTransform const &sipReverse)
	Convert a SipForwardTransform to an equivalent ScaledPolynomialTransform. More...

Friends
class	ScaledPolynomialTransformFitter

Detailed Description

A 2-d coordinate transform represented by a lazy composition of an AffineTransform, a PolynomialTransform, and another AffineTransform.

ScaledPolynomialTransform instances should be confined to a single thread.

Definition at line 157 of file PolynomialTransform.h.

Constructor & Destructor Documentation

ScaledPolynomialTransform() [1/3]

lsst::meas::astrom::ScaledPolynomialTransform::ScaledPolynomialTransform	(	PolynomialTransform const &	poly,
		geom::AffineTransform const &	inputScaling,
		geom::AffineTransform const &	outputScalingInverse
	)

Construct a new ScaledPolynomialTransform from its constituents.

Parameters

[in]	poly	A PolynomialTransform to be applied to points. after the inputScaling transform.
[in]	inputScaling	An AffineTransform to be applied immediately to input points.
[in]	outputScalingInverse	An AffineTransform to be applied to points after the PolynomialTransform.

Definition at line 195 of file PolynomialTransform.cc.

        : _poly(poly), _inputScaling(inputScaling), _outputScalingInverse(outputScalingInverse) {}

ScaledPolynomialTransform() [2/3]

lsst::meas::astrom::ScaledPolynomialTransform::ScaledPolynomialTransform ( ScaledPolynomialTransform const &  other )

default

ScaledPolynomialTransform() [3/3]

lsst::meas::astrom::ScaledPolynomialTransform::ScaledPolynomialTransform ( ScaledPolynomialTransform &&  other )

default

Member Function Documentation

convert() [1/3]

ScaledPolynomialTransform lsst::meas::astrom::ScaledPolynomialTransform::convert ( PolynomialTransform const &  poly )

static

Convert a PolynomialTransform to an equivalent ScaledPolynomialTransform.

This simply inserts identity AffineTransforms before and after applying the given PolynomialTransform.

Definition at line 172 of file PolynomialTransform.cc.

                                                                                            {
    return ScaledPolynomialTransform(poly, geom::AffineTransform(), geom::AffineTransform());
}

convert() [2/3]

ScaledPolynomialTransform lsst::meas::astrom::ScaledPolynomialTransform::convert ( SipForwardTransform const &  sipForward )

static

Convert a SipForwardTransform to an equivalent ScaledPolynomialTransform.

The input transform's CRPIX offset and CD matrix scaling are used to define the input and output affine transforms, respectively, leaving the polynomial coefficients unmodified.

Definition at line 176 of file PolynomialTransform.cc.

                                                                                                  {
    ScaledPolynomialTransform result(sipForward.getPoly(),
                                     geom::AffineTransform(geom::Point2D(0, 0) - sipForward.getPixelOrigin()),
                                     geom::AffineTransform(sipForward.getCdMatrix()));
    // Account for the terms outside the sum in the SIP definition (see comment
    // earlier in the file for more explanation).
    result._poly._xCoeffs(1, 0) += 1;
    result._poly._yCoeffs(0, 1) += 1;
    return result;
}

convert() [3/3]

ScaledPolynomialTransform lsst::meas::astrom::ScaledPolynomialTransform::convert ( SipReverseTransform const &  sipReverse )

static

Convert a SipForwardTransform to an equivalent ScaledPolynomialTransform.

The input transform's CD matrix scaling and CRPIX offset are used to define the input and output affine transforms, respectively, leaving the polynomial coefficients unmodified.

Definition at line 187 of file PolynomialTransform.cc.

                                                                                                  {
    ScaledPolynomialTransform result(sipReverse.getPoly(), geom::AffineTransform(sipReverse._cdInverse),
                                     geom::AffineTransform(geom::Extent2D(sipReverse.getPixelOrigin())));
    result._poly._xCoeffs(1, 0) += 1;
    result._poly._yCoeffs(0, 1) += 1;
    return result;
}

getInputScaling()

geom::AffineTransform const& lsst::meas::astrom::ScaledPolynomialTransform::getInputScaling ( ) const

inline

Return the first affine transform applied to input points.

Definition at line 212 of file PolynomialTransform.h.

{ return _inputScaling; }

getOutputScalingInverse()

geom::AffineTransform const& lsst::meas::astrom::ScaledPolynomialTransform::getOutputScalingInverse ( ) const

inline

Return the affine transform applied to points after the polynomial transform.

Definition at line 215 of file PolynomialTransform.h.

{ return _outputScalingInverse; }

getPoly()

PolynomialTransform const& lsst::meas::astrom::ScaledPolynomialTransform::getPoly ( ) const

inline

Return the polynomial transform applied after the input scaling.

Definition at line 209 of file PolynomialTransform.h.

{ return _poly; }

linearize()

geom::AffineTransform lsst::meas::astrom::ScaledPolynomialTransform::linearize

(

geom::Point2D const &

in

)

const

Return an approximate affine transform at the given point.

Definition at line 206 of file PolynomialTransform.cc.

                                                                                    {
    return _outputScalingInverse * _poly.linearize(_inputScaling(in)) * _inputScaling;
}

operator()()

geom::Point2D lsst::meas::astrom::ScaledPolynomialTransform::operator()

(

geom::Point2D const &

in

)

const

Apply the transform to a point.

Definition at line 210 of file PolynomialTransform.cc.

                                                                             {
    return _outputScalingInverse(_poly(_inputScaling(in)));
}

operator=() [1/2]

ScaledPolynomialTransform& lsst::meas::astrom::ScaledPolynomialTransform::operator= ( ScaledPolynomialTransform &&  other )

default

operator=() [2/2]

ScaledPolynomialTransform& lsst::meas::astrom::ScaledPolynomialTransform::operator= ( ScaledPolynomialTransform const &  other )

default

swap()

void lsst::meas::astrom::ScaledPolynomialTransform::swap

(

ScaledPolynomialTransform &

other

)

Definition at line 200 of file PolynomialTransform.cc.

                                                                     {
    _poly.swap(other._poly);
    std::swap(_inputScaling, other._inputScaling);
    std::swap(_outputScalingInverse, other._outputScalingInverse);
}

Friends And Related Function Documentation

ScaledPolynomialTransformFitter

friend class ScaledPolynomialTransformFitter

friend

Definition at line 228 of file PolynomialTransform.h.

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The documentation for this class was generated from the following files:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-0.7.0/Linux64/meas_astrom/22.0.1-12-g44dc1dc+2a20fdde0d/include/lsst/meas/astrom/PolynomialTransform.h
• /j/snowflake/release/lsstsw/stack/lsst-scipipe-0.7.0/Linux64/meas_astrom/22.0.1-12-g44dc1dc+2a20fdde0d/src/PolynomialTransform.cc