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LSST Data Management Base Package
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An algorithm that fits a 2-component shapelet approximation to the PSF model. More...
#include <DoubleShapeletPsfApprox.h>
Public Types | |
typedef DoubleShapeletPsfApproxControl | Control |
Public Member Functions | |
DoubleShapeletPsfApproxAlgorithm (Control const &ctrl, std::string const &name, afw::table::Schema &schema) | |
Failure modes passed by MeasurementErrors thrown by this class. | |
void | measure (afw::table::SourceRecord &measRecord, afw::image::Exposure< float > const &exposure) const |
Run all fitting stages on the Psf attached to the given Exposure, saving the results in measRecord. | |
void | fail (afw::table::SourceRecord &measRecord, lsst::meas::base::MeasurementError *error=nullptr) const |
Handle failures caught by the measurement plugin system, setting failure flags as appropriate. | |
void | measureForced (afw::table::SourceRecord &measRecord, afw::image::Exposure< float > const &exposure, afw::table::SourceRecord const &refRecord, afw::geom::SkyWcs const &refWcs) const override |
Called to measure a single child source in an image. | |
void | measureNForced (afw::table::SourceCatalog const &measCat, afw::image::Exposure< float > const &exposure, afw::table::SourceCatalog const &refRecord, afw::geom::SkyWcs const &refWcs) const override |
Called to simultaneously measure all children in a deblend family, in a single image. | |
virtual void | measureN (afw::table::SourceCatalog const &measCat, afw::image::Exposure< float > const &exposure) const |
Called to simultaneously measure all children in a deblend family, in a single image. | |
std::string | getLogName () const |
Static Public Member Functions | |
static base::FlagDefinitionList const & | getFlagDefinitions () |
static shapelet::MultiShapeletFunction | initializeResult (Control const &ctrl) |
Create a MultiShapeletFunction with orders and radii and amplitude ratios from the control object. | |
static void | fitMoments (shapelet::MultiShapeletFunction &result, Control const &ctrl, afw::image::Image< Scalar > const &psfImage) |
Update a MultiShapeletFunction's ellipses to match the first and second moments of a PSF image. | |
static std::shared_ptr< OptimizerObjective > | makeObjective (afw::geom::ellipses::Ellipse const &moments, Control const &ctrl, afw::image::Image< Scalar > const &psfImage) |
Return an Objective object that can be used to fit the profile of the model. | |
static void | fitProfile (shapelet::MultiShapeletFunction &result, Control const &ctrl, afw::image::Image< Scalar > const &psfImage) |
Update a MultiShapeletFunction's zeroth-order profile by fitting radii and amplitudes. | |
static void | fitShapelets (shapelet::MultiShapeletFunction &result, Control const &ctrl, afw::image::Image< Scalar > const &psfImage) |
Update a MultiShapeletFunction's higher-order shapelet terms, holding everything else fixed. | |
Static Public Attributes | |
static base::FlagDefinition const | FAILURE |
static base::FlagDefinition const | INVALID_POINT_FOR_PSF |
static base::FlagDefinition const | INVALID_MOMENTS |
static base::FlagDefinition const | MAX_ITERATIONS |
Protected Attributes | |
std::string | _logName |
An algorithm that fits a 2-component shapelet approximation to the PSF model.
This algorithm fits a similar model to the one that has been used on the HSC side for several data releases, but uses the improved optimizer in meas_modelfit instead of the one in (the now defunct) meas_extensions_multiShapelet and using moments to reduce the number of parameters in the fit. It is faster and more robust than GeneralShapeletPsfApprox, but much less flexible.
The model is not a fully general one, even for two shapelet components. We tie the ellipticities of the two components together, hold the center fixed, and keep their radii fixed at a value set in the configuration; this means we fit only one set of ellipse parameters, instead of two.
Definition at line 96 of file DoubleShapeletPsfApprox.h.
typedef DoubleShapeletPsfApproxControl lsst::meas::modelfit::DoubleShapeletPsfApproxAlgorithm::Control |
Definition at line 106 of file DoubleShapeletPsfApprox.h.
lsst::meas::modelfit::DoubleShapeletPsfApproxAlgorithm::DoubleShapeletPsfApproxAlgorithm | ( | Control const & | ctrl, |
std::string const & | name, | ||
afw::table::Schema & | schema ) |
Failure modes passed by MeasurementErrors thrown by this class.
Construct an algorithm for use with record outputs.
Essentially all of the functionality of this class is accessible through static methods, so an instance only needs to be constructed if you want to store the results in a record object.
[in] | ctrl | Control object specifying the details of the model and how to fit it. |
[in] | name | Name of the algorithm; will be used as the prefix for all field names. |
[in,out] | schema | Schema to which fields will be added. Must already contain a slot_Centroid alias pointing to fields with position information. |
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Handle failures caught by the measurement plugin system, setting failure flags as appropriate.
Implements lsst::meas::base::BaseAlgorithm.
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Update a MultiShapeletFunction's ellipses to match the first and second moments of a PSF image.
The relative ampltidues, radii, and ellipticities of the ellipses will not be modified; both ellipses will simply be transformed (together) such that the moments of the MultiShapeletFunction match the (unweighted) moments of the image, and the two components will be scaled together to match the total flux in the image.
[in,out] | result | MultiShapeletFunction to update. Must have unit circle moments. Probably the result of a call to initializeResult(). |
[in] | ctrl | Control object specifying the details of the model and how to fit it. |
[in] | psfImage | Image of the PSF to fit. Should have xy0 set such that (0,0) is at the center of the image. Probably the result of a call to Psf::computeKernelImage(). |
meas::base::MeasurementError | if the resulting moments are invalid, either because they have negative determinant or the radii are out of bounds. |
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Update a MultiShapeletFunction's zeroth-order profile by fitting radii and amplitudes.
Holding the center positions and ellipticities fixed, the radii and amplitudes of the two Gaussians are fit simultaneously with an optimizer. Higher-order terms will be ignored.
[in,out] | result | MultiShapeletFunction to update. Probably the result of a call to fitMoments(). |
[in] | ctrl | Control object specifying the details of the model and how to fit it. |
[in] | psfImage | Image of the PSF to fit. Should have xy0 set such that (0,0) is at the center of the image. Probably the result of a call to Psf::computeKernelImage(). |
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Update a MultiShapeletFunction's higher-order shapelet terms, holding everything else fixed.
All ellipse parameters and the zeroth-order (Gaussian) shapelet coefficients will be held fixed.
[in,out] | result | MultiShapeletFunction to update. Probably the result of a call to fitProfile(). |
[in] | ctrl | Control object specifying the details of the model and how to fit it. |
[in] | psfImage | Image of the PSF to fit. Should have xy0 set such that (0,0) is at the center of the image. Probably the result of a call to Psf::computeKernelImage(). |
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inlineinherited |
Definition at line 66 of file Algorithm.h.
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Create a MultiShapeletFunction with orders and radii and amplitude ratios from the control object.
This creates a circular two-component MultiShapeletFunction with unit total flux and unit circle moments, with zeroth-order amplitudes matching ctrl.peakRatio and ellipse radii matching ctrl.radiusRatio.
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Return an Objective object that can be used to fit the profile of the model.
By "profile" we mean the two radii and two zeroth-order amplitudes, which we fit in fitProfile() while holding all other parameters fixed.
This function is probably not useful to most users, who should just call fitProfile instead; it's public mostly to make it easier to test functionality internal to fitProfile().
The parameters expected by the Objective are:
[in] | moments | Ellipse computed from the moments of the MultiShapeletFunction to be fit. |
[in] | ctrl | Control object specifying the details of the model and how to fit it. |
[in] | psfImage | Image of the PSF to fit. Should have xy0 set such that (0,0) is at the center of the image. Probably the result of a call to Psf::computeKernelImage(). |
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Run all fitting stages on the Psf attached to the given Exposure, saving the results in measRecord.
We first call fitMoments(), then fitProfile(), then fitShapelets().
Implements lsst::meas::base::SingleFrameAlgorithm.
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inlineoverridevirtualinherited |
Called to measure a single child source in an image.
Before this method is called, all neighbors will be replaced with noise, using the outputs of the deblender. Outputs should be saved in the given SourceRecord, which can also be used to obtain centroid (see SafeCentroidExtractor) and shape (see SafeShapeExtractor) information.
Implements lsst::meas::base::ForcedAlgorithm.
Reimplemented in lsst::meas::extensions::photometryKron::KronFluxAlgorithm.
Definition at line 172 of file Algorithm.h.
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virtualinherited |
Called to simultaneously measure all children in a deblend family, in a single image.
Outputs should be saved in the given SourceCatalog, which can also be used to obtain centroid (see SafeCentroidExtractor) and shape (see SafeShapeExtractor) information.
The default implementation simply throws an exception, indicating that simultaneous measurement is not supported.
Definition at line 31 of file Algorithm.cc.
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inlineoverridevirtualinherited |
Called to simultaneously measure all children in a deblend family, in a single image.
Outputs should be saved in the given SourceCatalog, which can also be used to obtain centroid (see SafeCentroidExtractor) and shape (see SafeShapeExtractor) information.
The default implementation simply throws an exception, indicating that simultaneous measurement is not supported.
Reimplemented from lsst::meas::base::ForcedAlgorithm.
Definition at line 179 of file Algorithm.h.
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protectedinherited |
Definition at line 69 of file Algorithm.h.
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Definition at line 101 of file DoubleShapeletPsfApprox.h.
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Definition at line 103 of file DoubleShapeletPsfApprox.h.
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Definition at line 102 of file DoubleShapeletPsfApprox.h.
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Definition at line 104 of file DoubleShapeletPsfApprox.h.