lsst::jointcal::PhotometryTransform Class Reference

A photometric transform, defined in terms of the input flux or magnitude. More...

#include <PhotometryTransform.h>

Inheritance diagram for lsst::jointcal::PhotometryTransform:

Public Member Functions
virtual double	transform (double x, double y, double value) const =0
	Return the transform of value at (x,y). More...
double	transform (Point const &in, double value) const
	Return the transformed value at Point(x,y). More...
virtual double	transformError (double x, double y, double value, double valueErr) const =0
	Return the transformed valueErr at Point(x,y). More...
double	transformError (Point const &in, double value, double valueErr) const
	Return the transformed valueErr at Point(x,y). More...
virtual void	print (std::ostream &out) const =0
	Print the transform coefficients to stream. More...
virtual std::size_t	getNpar () const =0
	Return the number of parameters (used to compute chisq) More...
virtual void	offsetParams (Eigen::VectorXd const &delta)=0
	Offset the parameters by some (negative) amount during fitting. More...
virtual std::shared_ptr< PhotometryTransform >	clone () const =0
	return a copy (allocated by new) of the transformation. More...
virtual void	computeParameterDerivatives (double x, double y, double value, Eigen::Ref< Eigen::VectorXd > derivatives) const =0
	Compute the derivatives with respect to the parameters (i.e. More...
virtual Eigen::VectorXd	getParameters () const =0
	Get a copy of the parameters of this model, in the same order as offsetParams. More...

Friends
std::ostream &	operator<< (std::ostream &s, PhotometryTransform const &transform)

Detailed Description

A photometric transform, defined in terms of the input flux or magnitude.

Unit agnostic: a higher level Model must keep track of the units going into and out of of its Transforms.

See also

lsst::afw::image::PhotoCalib

Definition at line 52 of file PhotometryTransform.h.

Member Function Documentation

clone()

virtual std::shared_ptr<PhotometryTransform> lsst::jointcal::PhotometryTransform::clone ( ) const

pure virtual

return a copy (allocated by new) of the transformation.

Implemented in lsst::jointcal::MagnitudeTransformChebyshev, lsst::jointcal::FluxTransformChebyshev, lsst::jointcal::MagnitudeTransformSpatiallyInvariant, and lsst::jointcal::FluxTransformSpatiallyInvariant.

computeParameterDerivatives()

virtual void lsst::jointcal::PhotometryTransform::computeParameterDerivatives ( double  x, double  y, double  value, Eigen::Ref< Eigen::VectorXd >  derivatives  ) const

pure virtual

Compute the derivatives with respect to the parameters (i.e.

the coefficients).

Parameters

[in]	x	The x coordinate to compute at (in the appropriate units for this transform).
[in]	y	The y coordinate to compute at (in the appropriate units for this transform).
[in]	value	The instrument flux or magnitude to compute the derivative at.
[out]	derivatives	The computed derivatives, in the same order as the deltas in offsetParams.

Implemented in lsst::jointcal::MagnitudeTransformChebyshev, lsst::jointcal::FluxTransformChebyshev, lsst::jointcal::MagnitudeTransformSpatiallyInvariant, and lsst::jointcal::FluxTransformSpatiallyInvariant.

getNpar()

virtual std::size_t lsst::jointcal::PhotometryTransform::getNpar ( ) const

pure virtual

Return the number of parameters (used to compute chisq)

Implemented in lsst::jointcal::PhotometryTransformChebyshev, and lsst::jointcal::PhotometryTransformSpatiallyInvariant.

getParameters()

virtual Eigen::VectorXd lsst::jointcal::PhotometryTransform::getParameters ( ) const

pure virtual

Get a copy of the parameters of this model, in the same order as offsetParams.

Implemented in lsst::jointcal::PhotometryTransformChebyshev, and lsst::jointcal::PhotometryTransformSpatiallyInvariant.

offsetParams()

virtual void lsst::jointcal::PhotometryTransform::offsetParams ( Eigen::VectorXd const &  delta )

pure virtual

Offset the parameters by some (negative) amount during fitting.

Equivalent to flatten(parameters) -= delta

Ordering of delta is the same as the ordering of the derivatives returned from computeParameterDerivatives.

Implemented in lsst::jointcal::PhotometryTransformChebyshev, and lsst::jointcal::PhotometryTransformSpatiallyInvariant.

print()

virtual void lsst::jointcal::PhotometryTransform::print ( std::ostream &  out ) const

pure virtual

Print the transform coefficients to stream.

Implemented in lsst::jointcal::PhotometryTransformChebyshev, and lsst::jointcal::PhotometryTransformSpatiallyInvariant.

transform() [1/2]

virtual double lsst::jointcal::PhotometryTransform::transform ( double  x, double  y, double  value  ) const

pure virtual

Return the transform of value at (x,y).

Implemented in lsst::jointcal::MagnitudeTransformChebyshev, lsst::jointcal::FluxTransformChebyshev, lsst::jointcal::FluxTransformSpatiallyInvariant, and lsst::jointcal::MagnitudeTransformSpatiallyInvariant.

transform() [2/2]

double lsst::jointcal::PhotometryTransform::transform ( Point const &  in, double  value  ) const

inline

Return the transformed value at Point(x,y).

Definition at line 58 of file PhotometryTransform.h.

{ return transform(in.x, in.y, value); }

transformError() [1/2]

virtual double lsst::jointcal::PhotometryTransform::transformError ( double  x, double  y, double  value, double  valueErr  ) const

pure virtual

Return the transformed valueErr at Point(x,y).

Implemented in lsst::jointcal::PhotometryTransformChebyshev, lsst::jointcal::MagnitudeTransformSpatiallyInvariant, and lsst::jointcal::FluxTransformSpatiallyInvariant.

transformError() [2/2]

double lsst::jointcal::PhotometryTransform::transformError ( Point const &  in, double  value, double  valueErr  ) const

inline

Return the transformed valueErr at Point(x,y).

Definition at line 64 of file PhotometryTransform.h.

                                                                                {
        return transformError(in.x, in.y, value, valueErr);
    }

Friends And Related Function Documentation

operator<<

std::ostream& operator<< ( std::ostream &  s, PhotometryTransform const &  transform  )

friend

Definition at line 71 of file PhotometryTransform.h.

                                                                                       {
        transform.print(s);
        return s;
    }

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

• /j/snowflake/release/lsstsw/stack/1a1d771/Linux64/jointcal/20.0.0/include/lsst/jointcal/PhotometryTransform.h