lsst.afw.math::BoundedField Class Reference

An abstract base class for 2-d functions defined on an integer bounding boxes. More...

#include <BoundedField.h>

Inheritance diagram for lsst.afw.math::BoundedField:

Public Member Functions
virtual double	evaluate (geom::Point2D const &position) const =0
double	evaluate (double x, double y) const
ndarray::Array< double, 1, 1 >	evaluate (ndarray::Array< double const, 1 > const &x, ndarray::Array< double const, 1 > const &y) const
geom::Box2I	getBBox () const
template<typename T >
void	fillImage (image::Image< T > &image, bool overlapOnly=false) const
template<typename T >
void	addToImage (image::Image< T > &image, double scaleBy=1.0, bool overlapOnly=false) const
template<typename T >
void	multiplyImage (image::Image< T > &image, bool overlapOnly=false) const
template<typename T >
void	divideImage (image::Image< T > &image, bool overlapOnly=false) const
virtual boost::shared_ptr < BoundedField >	operator* (double const scale) const =0
boost::shared_ptr< BoundedField >	operator/ (double scale) const
virtual	~BoundedField ()
Public Member Functions inherited from lsst.afw.table.io::Persistable
void	writeFits (std::string const &fileName, std::string const &mode="w") const
	Write the object to a regular FITS file. More...
void	writeFits (fits::MemFileManager &manager, std::string const &mode="w") const
	Write the object to a FITS image in memory. More...
void	writeFits (fits::Fits &fitsfile) const
	Write the object to an already-open FITS object. More...
virtual bool	isPersistable () const
	Return true if this particular object can be persisted using afw::table::io. More...
virtual	~Persistable ()

Protected Member Functions
	BoundedField (geom::Box2I const &bbox)
Protected Member Functions inherited from lsst.afw.table.io::Persistable
virtual std::string	getPersistenceName () const
	Return the unique name used to persist this object and look up its factory. More...
virtual std::string	getPythonModule () const
	Return the fully-qualified Python module that should be imported to guarantee that its factory is registered. More...
virtual void	write (OutputArchiveHandle &handle) const
	Write the object to one or more catalogs. More...
	Persistable ()
	Persistable (Persistable const &other)
void	operator= (Persistable const &other)

Private Attributes
geom::Box2I const	_bbox

Additional Inherited Members
Static Public Member Functions inherited from lsst.afw.table.io::PersistableFacade< BoundedField >
static boost::shared_ptr < BoundedField >	readFits (fits::Fits &fitsfile)
	Read an object from an already open FITS object. More...
static boost::shared_ptr < BoundedField >	readFits (std::string const &fileName, int hdu=0)
	Read an object from a regular FITS file. More...
static boost::shared_ptr < BoundedField >	readFits (fits::MemFileManager &manager, int hdu=0)
	Read an object from a FITS file in memory. More...
Protected Types inherited from lsst.afw.table.io::Persistable
typedef io::OutputArchiveHandle	OutputArchiveHandle

Detailed Description

An abstract base class for 2-d functions defined on an integer bounding boxes.

BoundedField provides a number of ways of accessing the function, all delegating to a single evaluate-at-a-point implementation. The base class does not mandate anything about how the field is constructed, so it's appropriate for use with e.g. model-fitting results, interpolation results points, or functions known a priori.

Usually, BoundedField will be used to represent functions that correspond to images, for quantities such as aperture corrections, photometric scaling, PSF model parameters, or backgrounds, and its bounding box will be set to match the PARENT bounding box of the image.

Definition at line 49 of file BoundedField.h.

Constructor & Destructor Documentation

virtual lsst.afw.math::BoundedField::~BoundedField ( )

inlinevirtual

Definition at line 160 of file BoundedField.h.

{}

lsst.afw.math::BoundedField::BoundedField ( geom::Box2I const &  bbox )

inlineexplicitprotected

Definition at line 164 of file BoundedField.h.

: _bbox(bbox) {}

Member Function Documentation

template<typename T >

template void lsst.afw.math::BoundedField::addToImage	(	image::Image< T > &	image,
		double	scaleBy = 1.0,
		bool	overlapOnly = false
	)		const

Add the field or a constant multiple of it to an image in-place

Parameters

[out]	image	Image to add to.
[in]	scaleBy	Multiply the field by this before adding it to the image.
[in]	overlapOnly	If true, only modify the region in the intersection of image.getBBox(image::PARENT) and this->getBBox().

Exceptions

pex::exceptions::RuntimeError

if the bounding boxes do not overlap and overlapOnly=false.

Definition at line 113 of file BoundedField.cc.

                                                                                         {
    applyToImage(*this, img, ScaledAdd(scaleBy), overlapOnly);
}

template<typename T >

template void lsst.afw.math::BoundedField::divideImage	(	image::Image< T > &	image,
		bool	overlapOnly = false
	)		const

Divide an image by the field in-place.

Parameters

[out]	image	Image to fill.
[in]	overlapOnly	If true, only modify the region in the intersection of image.getBBox(image::PARENT) and this->getBBox().

Exceptions

pex::exceptions::RuntimeError

if the bounding boxes do not overlap and overlapOnly=false.

Definition at line 123 of file BoundedField.cc.

                                                                          {
    applyToImage(*this, img, Divide(), overlapOnly);
}

virtual double lsst.afw.math::BoundedField::evaluate ( geom::Point2D const &  position ) const

pure virtual

Evaluate the field at the given point.

This is the only abstract method to be implemented by subclasses.

Subclasses should not provide bounds checking on the given position; this is the responsibility of the user, who can almost always do it more efficiently.

Implemented in lsst.afw.math::ChebyshevBoundedField, and lsst::meas::algorithms::CoaddBoundedField.

double lsst.afw.math::BoundedField::evaluate ( double  x, double  y  ) const

inline

Evaluate the field at the given point.

This delegates to the evaluate() method that takes geom::Point2D.

There is no bounds-checking on the given position; this is the responsibility of the user, who can almost always do it more efficiently.

Definition at line 70 of file BoundedField.h.

{ return evaluate(geom::Point2D(x, y)); }

ndarray::Array< double, 1, 1 > lsst.afw.math::BoundedField::evaluate	(	ndarray::Array< double const, 1 > const &	x,
		ndarray::Array< double const, 1 > const &	y
	)		const

Evaluate the field at multiple arbitrary points

Parameters

[in]	x	array of x coordinates, same shape as y
[in]	y	array of y coordinates, same shape as x

Returns

an array of output values, same shape as x and y

There is no bounds-checking on the given positions; this is the responsibility of the user, who can almost always do it more efficiently.

Definition at line 30 of file BoundedField.cc.

        {
    ndarray::Array<double,1,1> out = ndarray::allocate(x.getSize<0>());
    for (int i = 0, n = x.getSize<0>(); i < n; ++i) {
        out[i] = evaluate(x[i], y[i]);
    }
    return out;
}

template<typename T >

template void lsst.afw.math::BoundedField::fillImage	(	image::Image< T > &	image,
		bool	overlapOnly = false
	)		const

Assign the field to an image, overwriting values already present.

Parameters

[out]	image	Image to fill.
[in]	overlapOnly	If true, only modify the region in the intersection of image.getBBox(image::PARENT) and this->getBBox().

Exceptions

pex::exceptions::RuntimeError

if the bounding boxes do not overlap and overlapOnly=false.

Definition at line 108 of file BoundedField.cc.

                                                                        {
    applyToImage(*this, img, Assign(), overlapOnly);
}

geom::Box2I lsst.afw.math::BoundedField::getBBox ( ) const

inline

Return the bounding box that defines the region where the field is valid

Because this is an integer bounding box, its minimum and maximum positions are the centers of the pixels where the field is valid, but the field can be assumed to be valid to the edges of those pixels, which is the boundary you'd get by converting the returned Box2I into a Box2D.

Definition at line 95 of file BoundedField.h.

{ return _bbox; }

template<typename T >

template void lsst.afw.math::BoundedField::multiplyImage	(	image::Image< T > &	image,
		bool	overlapOnly = false
	)		const

Multiply an image by the field in-place.

Parameters

[out]	image	Image to fill.
[in]	overlapOnly	If true, only modify the region in the intersection of image.getBBox(image::PARENT) and this->getBBox().

Exceptions

pex::exceptions::RuntimeError

if the bounding boxes do not overlap and overlapOnly=false.

Definition at line 118 of file BoundedField.cc.

                                                                            {
    applyToImage(*this, img, Multiply(), overlapOnly);
}

virtual boost::shared_ptr< BoundedField > lsst.afw.math::BoundedField::operator* ( double const  scale ) const

pure virtual

Return a scaled BoundedField

Parameters

[in]

scale

Scaling factor

Implemented in lsst.afw.math::ChebyshevBoundedField, and lsst::meas::algorithms::CoaddBoundedField.

boost::shared_ptr< BoundedField > lsst.afw.math::BoundedField::operator/ ( double  scale ) const

inline

Definition at line 156 of file BoundedField.h.

                                                    {
        return (*this)*(1.0/scale);
    }

Member Data Documentation

geom::Box2I const lsst.afw.math::BoundedField::_bbox

private

Definition at line 167 of file BoundedField.h.

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

• /home/lsstsw/stack/Linux64/afw/11.0.rc2+4/include/lsst/afw/math/BoundedField.h
• /home/lsstsw/stack/Linux64/afw/11.0.rc2+4/src/math/BoundedField.cc