lsst.afw.math::AnalyticKernel Class Reference

A kernel described by a function. More...

#include <Kernel.h>

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

Classes
class	Factory

Public Types
typedef boost::shared_ptr < AnalyticKernel >	Ptr
typedef boost::shared_ptr < AnalyticKernel const >	ConstPtr
typedef lsst::afw::math::Function2 < Pixel >	KernelFunction
typedef boost::shared_ptr < lsst::afw::math::Function2 < Pixel > >	KernelFunctionPtr
Public Types inherited from lsst.afw.math::Kernel
typedef double	Pixel
typedef boost::shared_ptr< Kernel >	Ptr
typedef boost::shared_ptr < Kernel const >	ConstPtr
typedef boost::shared_ptr < lsst::afw::math::Function2 < double > >	SpatialFunctionPtr
typedef lsst::afw::math::Function2 < double >	SpatialFunction
typedef lsst::afw::math::NullFunction2 < double >	NullSpatialFunction
typedef generic_kernel_tag	kernel_fill_factor
Public Types inherited from lsst::daf::base::Citizen
enum	{ magicSentinel = 0xdeadbeef }
typedef unsigned long	memId
	Type of the block's ID. More...
typedef memId(*	memNewCallback )(const memId cid)
	A function used to register a callback. More...
typedef memId(*	memCallback )(const Citizen *ptr)
Public Types inherited from lsst::daf::base::Persistable
typedef boost::shared_ptr < Persistable >	Ptr

Public Member Functions
	AnalyticKernel ()
	Construct an empty spatially invariant AnalyticKernel of size 0x0. More...
	AnalyticKernel (int width, int height, KernelFunction const &kernelFunction, Kernel::SpatialFunction const &spatialFunction=NullSpatialFunction())
	Construct a spatially invariant AnalyticKernel, or a spatially varying AnalyticKernel where the spatial model is described by one function (that is cloned to give one per analytic function parameter). More...
	AnalyticKernel (int width, int height, KernelFunction const &kernelFunction, std::vector< Kernel::SpatialFunctionPtr > const &spatialFunctionList)
	Construct a spatially varying AnalyticKernel, where the spatial model is described by a list of functions (one per analytic function parameter). More...
virtual	~AnalyticKernel ()
virtual boost::shared_ptr< Kernel >	clone () const
	Return a pointer to a deep copy of this kernel. More...
double	computeImage (lsst::afw::image::Image< Pixel > &image, bool doNormalize, double x=0.0, double y=0.0) const
	Compute an image (pixellized representation of the kernel) in place. More...
virtual std::vector< double >	getKernelParameters () const
	Return the current kernel parameters. More...
virtual KernelFunctionPtr	getKernelFunction () const
	Get a deep copy of the kernel function. More...
virtual std::string	toString (std::string const &prefix="") const
	Return a string representation of the kernel. More...
virtual bool	isPersistable () const
	Return true if this particular object can be persisted using afw::table::io. More...
Public Member Functions inherited from lsst.afw.math::Kernel
	Kernel ()
	Construct a null Kernel of size 0,0. More...
	Kernel (int width, int height, unsigned int nKernelParams, SpatialFunction const &spatialFunction=NullSpatialFunction())
	Construct a spatially invariant Kernel or a spatially varying Kernel with one spatial function that is duplicated as needed. More...
	Kernel (int width, int height, const std::vector< SpatialFunctionPtr > spatialFunctionList)
	Construct a spatially varying Kernel with a list of spatial functions (one per kernel parameter) More...
virtual	~Kernel ()
double	computeImage (lsst::afw::image::Image< Pixel > &image, bool doNormalize, double x=0.0, double y=0.0) const
	Compute an image (pixellized representation of the kernel) in place. More...
geom::Extent2I const	getDimensions () const
	Return the Kernel's dimensions (width, height) More...
void	setDimensions (geom::Extent2I dims)
void	setWidth (int width)
void	setHeight (int height)
int	getWidth () const
	Return the Kernel's width. More...
int	getHeight () const
	Return the Kernel's height. More...
lsst::afw::geom::Point2I	getCtr () const
	Return index of kernel's center. More...
int	getCtrX () const
	Return x index of kernel's center. More...
int	getCtrY () const
	Return y index of kernel's center. More...
lsst::afw::geom::Box2I	getBBox () const
	return parent bounding box, with XY0 = -center More...
unsigned int	getNKernelParameters () const
	Return the number of kernel parameters (0 if none) More...
int	getNSpatialParameters () const
	Return the number of spatial parameters (0 if not spatially varying) More...
SpatialFunctionPtr	getSpatialFunction (unsigned int index) const
	Return a clone of the specified spatial function (one component of the spatial model) More...
std::vector< SpatialFunctionPtr >	getSpatialFunctionList () const
	Return a list of clones of the spatial functions. More...
virtual double	getKernelParameter (unsigned int i) const
lsst::afw::geom::Box2I	growBBox (lsst::afw::geom::Box2I const &bbox) const
lsst::afw::geom::Box2I	shrinkBBox (lsst::afw::geom::Box2I const &bbox) const
void	setCtr (lsst::afw::geom::Point2I ctr)
	Set index of kernel's center. More...
void	setCtrX (int ctrX)
	Set x index of kernel's center. More...
void	setCtrY (int ctrY)
	Set y index of kernel's center. More...
std::vector< std::vector < double > >	getSpatialParameters () const
	Return the spatial parameters parameters (an empty vector if not spatially varying) More...
bool	isSpatiallyVarying () const
	Return true iff the kernel is spatially varying (has a spatial function) More...
void	setKernelParameters (std::vector< double > const &params)
	Set the kernel parameters of a spatially invariant kernel. More...
void	setKernelParameters (std::pair< double, double > const &params)
	Set the kernel parameters of a 2-component spatially invariant kernel. More...
void	setSpatialParameters (const std::vector< std::vector< double > > params)
	Set the parameters of all spatial functions. More...
void	computeKernelParametersFromSpatialModel (std::vector< double > &kernelParams, double x, double y) const
	Compute the kernel parameters at a specified point. More...
virtual void	computeCache (int const )
	Compute a cache of Kernel values, if desired. More...
virtual int	getCacheSize () const
	Get the current size of the kernel cache (0 if none or if caches not supported) More...
Public Member Functions inherited from lsst::daf::base::Citizen
	Citizen (const std::type_info &)
	Citizen (Citizen const &)
	~Citizen ()
Citizen &	operator= (Citizen const &)
std::string	repr () const
	Return a string representation of a Citizen. More...
void	markPersistent (void)
	Mark a Citizen as persistent and not destroyed until process end. More...
memId	getId () const
	Return the Citizen's ID. More...
Public Member Functions inherited from lsst::daf::base::Persistable
	Persistable (void)
virtual	~Persistable (void)
template<class Archive >
void	serialize (Archive &, unsigned int const)
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	~Persistable ()

Protected Member Functions
virtual double	doComputeImage (lsst::afw::image::Image< Pixel > &image, bool doNormalize) const
	Low-level version of computeImage. More...
virtual std::string	getPersistenceName () const
	Return the unique name used to persist this object and look up its factory. More...
virtual void	write (OutputArchiveHandle &handle) const
	Write the object to one or more catalogs. More...
virtual void	setKernelParameter (unsigned int ind, double value) const
	Set one kernel parameter. More...
template<class Archive >
void	serialize (Archive &ar, unsigned int const version)
Protected Member Functions inherited from lsst.afw.math::Kernel
virtual std::string	getPythonModule () const
	Return the fully-qualified Python module that should be imported to guarantee that its factory is registered. More...
void	setKernelParametersFromSpatialModel (double x, double y) const
	Set the kernel parameters from the spatial model (if any). More...
Protected Member Functions inherited from lsst.afw.table.io::Persistable
	Persistable ()
	Persistable (Persistable const &other)
void	operator= (Persistable const &other)

Protected Attributes
KernelFunctionPtr	_kernelFunctionPtr
Protected Attributes inherited from lsst.afw.math::Kernel
std::vector< SpatialFunctionPtr >	_spatialFunctionList

Friends
class	boost::serialization::access

Additional Inherited Members
Static Public Member Functions inherited from lsst.afw.table.io::PersistableFacade< AnalyticKernel >
static boost::shared_ptr < AnalyticKernel >	readFits (fits::Fits &fitsfile)
	Read an object from an already open FITS object. More...
static boost::shared_ptr < AnalyticKernel >	readFits (std::string const &fileName, int hdu=0)
	Read an object from a regular FITS file. More...
static boost::shared_ptr < AnalyticKernel >	readFits (fits::MemFileManager &manager, int hdu=0)
	Read an object from a FITS file in memory. More...
Static Public Member Functions inherited from lsst::daf::base::Citizen
static bool	hasBeenCorrupted ()
	Check all allocated blocks for corruption. More...
static memId	getNextMemId ()
	Return the memId of the next object to be allocated. More...
static int	init ()
	Called once when the memory system is being initialised. More...
static int	census (int, memId startingMemId=0)
	How many active Citizens are there? More...
static void	census (std::ostream &stream, memId startingMemId=0)
	Print a list of all active Citizens to stream, sorted by ID. More...
static const std::vector < const Citizen * > *	census ()
	Return a (newly allocated) std::vector of active Citizens sorted by ID. More...
static memId	setNewCallbackId (memId id)
	Call the NewCallback when block is allocated. More...
static memId	setDeleteCallbackId (memId id)
	Call the current DeleteCallback when block is deleted. More...
static memNewCallback	setNewCallback (memNewCallback func)
	Set the NewCallback function. More...
static memCallback	setDeleteCallback (memCallback func)
	Set the DeleteCallback function. More...
static memCallback	setCorruptionCallback (memCallback func)
	Set the CorruptionCallback function. More...
Static Public Member Functions inherited from lsst.afw.table.io::PersistableFacade< Kernel >
static boost::shared_ptr< Kernel >	readFits (fits::Fits &fitsfile)
	Read an object from an already open FITS object. More...
static boost::shared_ptr< Kernel >	readFits (std::string const &fileName, int hdu=0)
	Read an object from a regular FITS file. More...
static boost::shared_ptr< Kernel >	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

A kernel described by a function.

The function's x, y arguments are as follows:

• -getCtr() for the lower left corner pixel
• 0, 0 for the center pixel
• (getDimensions() - 1) - getCtr() for the upper right pixel

Note: each pixel is set to the value of the kernel function at the center of the pixel (rather than averaging the function over the area of the pixel).

Definition at line 628 of file Kernel.h.

Member Typedef Documentation

typedef boost::shared_ptr< AnalyticKernel const> lsst.afw.math::AnalyticKernel::ConstPtr

Definition at line 631 of file Kernel.h.

typedef lsst::afw::math::Function2<Pixel> lsst.afw.math::AnalyticKernel::KernelFunction

Definition at line 632 of file Kernel.h.

typedef boost::shared_ptr< lsst::afw::math::Function2<Pixel> > lsst.afw.math::AnalyticKernel::KernelFunctionPtr

Definition at line 633 of file Kernel.h.

typedef boost::shared_ptr< AnalyticKernel > lsst.afw.math::AnalyticKernel::Ptr

Definition at line 630 of file Kernel.h.

Constructor & Destructor Documentation

lsst.afw.math::AnalyticKernel::AnalyticKernel ( )

explicit

Construct an empty spatially invariant AnalyticKernel of size 0x0.

Definition at line 35 of file AnalyticKernel.cc.

:
    Kernel(),
    _kernelFunctionPtr()
{}

lsst.afw.math::AnalyticKernel::AnalyticKernel ( int  width, int  height, KernelFunction const &  kernelFunction, Kernel::SpatialFunction const &  spatialFunction = NullSpatialFunction()  )

explicit

Construct a spatially invariant AnalyticKernel, or a spatially varying AnalyticKernel where the spatial model is described by one function (that is cloned to give one per analytic function parameter).

Parameters

width	width of kernel
height	height of kernel
kernelFunction	kernel function; a deep copy is made
spatialFunction	spatial function; one deep copy is made for each kernel function parameter; if omitted or set to Kernel::NullSpatialFunction() then the kernel is spatially invariant

Definition at line 41 of file AnalyticKernel.cc.

  :
    Kernel(width, height, kernelFunction.getNParameters(), spatialFunction),
    _kernelFunctionPtr(kernelFunction.clone())
{}

lsst.afw.math::AnalyticKernel::AnalyticKernel ( int  width, int  height, KernelFunction const &  kernelFunction, std::vector< Kernel::SpatialFunctionPtr > const &  spatialFunctionList  )

explicit

Construct a spatially varying AnalyticKernel, where the spatial model is described by a list of functions (one per analytic function parameter).

Exceptions

lsst::pex::exceptions::InvalidParameterError

if the length of spatialFunctionList != # kernel function parameters.

Parameters

width	width of kernel
height	height of kernel
kernelFunction	kernel function; a deep copy is made
spatialFunctionList	list of spatial functions, one per kernel function parameter; a deep copy is made of each function

Definition at line 51 of file AnalyticKernel.cc.

  :
    Kernel(width, height, spatialFunctionList),
    _kernelFunctionPtr(kernelFunction.clone())
{
    if (kernelFunction.getNParameters() != spatialFunctionList.size()) {
        std::ostringstream os;
        os << "kernelFunction.getNParameters() = " << kernelFunction.getNParameters()
            << " != " << spatialFunctionList.size() << " = " << "spatialFunctionList.size()";
        throw LSST_EXCEPT(pexExcept::InvalidParameterError, os.str());
    }
}

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

inlinevirtual

Definition at line 669 of file Kernel.h.

{}

Member Function Documentation

boost::shared_ptr< afwMath::Kernel > lsst.afw.math::AnalyticKernel::clone ( ) const

virtual

Return a pointer to a deep copy of this kernel.

This kernel exists instead of a copy constructor so one can obtain a copy of an actual kernel instead of a useless copy of the base class.

Every kernel subclass must override this method.

Returns

a pointer to a deep copy of the kernel

Implements lsst.afw.math::Kernel.

Definition at line 68 of file AnalyticKernel.cc.

                                                      {
    PTR(afwMath::Kernel) retPtr;
    if (this->isSpatiallyVarying()) {
        retPtr.reset(new afwMath::AnalyticKernel(this->getWidth(), this->getHeight(),
            *(this->_kernelFunctionPtr), this->_spatialFunctionList));
    } else {
        retPtr.reset(new afwMath::AnalyticKernel(this->getWidth(), this->getHeight(),
            *(this->_kernelFunctionPtr)));
    }
    retPtr->setCtr(this->getCtr());
    return retPtr;
}

double lsst.afw.math::AnalyticKernel::computeImage	(	lsst::afw::image::Image< Pixel > &	image,
		bool	doNormalize,
		double	x = 0.0,
		double	y = 0.0
	)		const

Compute an image (pixellized representation of the kernel) in place.

This special version accepts any size image (though you can get in trouble if the image is large enough that the image is evaluated outside its domain).

x, y are ignored if there is no spatial function.

Returns

The kernel sum

Note

computeNewImage has been retired; it doesn't need to be a member

Exceptions

lsst::pex::exceptions::InvalidParameterError	if the image is the wrong size
lsst::pex::exceptions::OverflowError	if doNormalize is true and the kernel sum is exactly 0

Parameters

image	image whose pixels are to be set (output) xy0 of the image will be set to -kernel.getCtr() - border, where border = (image.getDimensions() - kernel.getDimensions()) / 2
doNormalize	normalize the image (so sum is 1)?
x	x (column position) at which to compute spatial function
y	y (row position) at which to compute spatial function

Definition at line 81 of file AnalyticKernel.cc.

        {
    afwGeom::Extent2I llBorder = (image.getDimensions() - getDimensions()) / 2;
    image.setXY0(afwGeom::Point2I(-afwGeom::Extent2I(getCtr()+ llBorder)));
    if (this->isSpatiallyVarying()) {
        this->setKernelParametersFromSpatialModel(x, y);
    }
    return doComputeImage(image, doNormalize);
}

double lsst.afw.math::AnalyticKernel::doComputeImage ( lsst::afw::image::Image< Pixel > &  image, bool  doNormalize  ) const

protectedvirtual

Low-level version of computeImage.

Before this is called the image dimensions are checked, the image's xy0 is set and the kernel's parameters are set. This routine sets the pixels, including normalization if requested.

Returns

The kernel sum

Implements lsst.afw.math::Kernel.

Definition at line 116 of file AnalyticKernel.cc.

        {
    double imSum = 0;
    for (int y = 0; y != image.getHeight(); ++y) {
        double const fy = image.indexToPosition(y, afwImage::Y);
        afwImage::Image<Pixel>::x_iterator ptr = image.row_begin(y);
        for (int x = 0; x != image.getWidth(); ++x, ++ptr) {
            double const fx = image.indexToPosition(x, afwImage::X);
            Pixel const pixelVal = (*_kernelFunctionPtr)(fx, fy);
            *ptr = pixelVal;
            imSum += pixelVal;
        }
    }

    if (doNormalize && (imSum != 1)) {
        if (imSum == 0) {
            throw LSST_EXCEPT(pexExcept::OverflowError, "Cannot normalize; kernel sum is 0");
        }
        image /= imSum;
        imSum = 1;
    }

    return imSum;
}

afwMath::AnalyticKernel::KernelFunctionPtr lsst.afw.math::AnalyticKernel::getKernelFunction ( ) const

virtual

Get a deep copy of the kernel function.

Definition at line 95 of file AnalyticKernel.cc.

        {
    return _kernelFunctionPtr->clone();
}

std::vector< double > lsst.afw.math::AnalyticKernel::getKernelParameters ( ) const

virtual

Return the current kernel parameters.

If the kernel is spatially varying then the parameters are those last computed. See also computeKernelParametersFromSpatialModel. If there are no kernel parameters then returns an empty vector.

Reimplemented from lsst.afw.math::Kernel.

Definition at line 109 of file AnalyticKernel.cc.

                                                                   {
    return _kernelFunctionPtr->getParameters();
}

std::string lsst.afw.math::AnalyticKernel::getPersistenceName ( ) const

protectedvirtual

Return the unique name used to persist this object and look up its factory.

Must be less than ArchiveIndexSchema::MAX_NAME_LENGTH characters.

Reimplemented from lsst.afw.table.io::Persistable.

Definition at line 210 of file AnalyticKernel.cc.

{ return getAnalyticKernelPersistenceName(); }

virtual bool lsst.afw.math::AnalyticKernel::isPersistable ( ) const

inlinevirtual

Return true if this particular object can be persisted using afw::table::io.

Reimplemented from lsst.afw.table.io::Persistable.

Definition at line 708 of file Kernel.h.

{ return true; }

template<class Archive >

void lsst.afw.math::AnalyticKernel::serialize ( Archive &  ar, unsigned int const  version  )

inlineprotected

Definition at line 729 of file Kernel.h.

                                                                    {
                ar & make_nvp("k",
                        boost::serialization::base_object<Kernel>(*this));
                ar & make_nvp("fn", _kernelFunctionPtr);
            }

void lsst.afw.math::AnalyticKernel::setKernelParameter ( unsigned int  ind, double  value  ) const

protectedvirtual

Set one kernel parameter.

Classes that have kernel parameters must subclass this function.

This function is marked "const", despite modifying unimportant internals, so that computeImage can be const.

Exceptions

lsst::pex::exceptions::InvalidParameterError

always (unless subclassed)

Reimplemented from lsst.afw.math::Kernel.

Definition at line 143 of file AnalyticKernel.cc.

                                                                                   {
    _kernelFunctionPtr->setParameter(ind, value);
}

std::string lsst.afw.math::AnalyticKernel::toString ( std::string const &  prefix = "" ) const

virtual

Return a string representation of the kernel.

Reimplemented from lsst.afw.math::Kernel.

Definition at line 100 of file AnalyticKernel.cc.

                                                                       {
    std::ostringstream os;
    os << prefix << "AnalyticKernel:" << std::endl;
    os << prefix << "..function: " << (_kernelFunctionPtr ? _kernelFunctionPtr->toString() : "None")
        << std::endl;
    os << Kernel::toString(prefix + "\t");
    return os.str();
}

void lsst.afw.math::AnalyticKernel::write ( OutputArchiveHandle &  handle ) const

protectedvirtual

Write the object to one or more catalogs.

The handle object passed to this function provides an interface for adding new catalogs and adding nested objects to the same archive (while checking for duplicates). See OutputArchiveHandle for more information.

Reimplemented from lsst.afw.table.io::Persistable.

Definition at line 212 of file AnalyticKernel.cc.

                                                             {
    AnalyticKernelPersistenceHelper const keys(_spatialFunctionList.size());
    PTR(afw::table::BaseRecord) record = keys.write(handle, *this);
    record->set(keys.kernelFunction, handle.put(_kernelFunctionPtr.get()));
}

Friends And Related Function Documentation

friend class boost::serialization::access

friend

Definition at line 727 of file Kernel.h.

Member Data Documentation

KernelFunctionPtr lsst.afw.math::AnalyticKernel::_kernelFunctionPtr

protected

Definition at line 725 of file Kernel.h.

---

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

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