lsst::meas::algorithms::evalChi2Visitor< PixelT > Class Template Reference

A class to pass around to all our PsfCandidates to evaluate the PSF fit's X^2. More...

Inheritance diagram for lsst::meas::algorithms::evalChi2Visitor< PixelT >:

Public Member Functions
	evalChi2Visitor (afwMath::Kernel const &kernel, double lambda)
void	reset ()
void	processCandidate (afwMath::SpatialCellCandidate *candidate)
double	getValue () const
Public Member Functions inherited from lsst::afw::math::CandidateVisitor
	CandidateVisitor ()
virtual	~CandidateVisitor ()

Private Types
typedef afwImage::Image< PixelT >	Image
typedef afwImage::MaskedImage < PixelT >	MaskedImage
typedef afwImage::Exposure < PixelT >	Exposure
typedef afwImage::Image < afwMath::Kernel::Pixel >	KImage

Private Attributes
double	_chi2
afwMath::Kernel const &	_kernel
double	_lambda
KImage::Ptr	_kImage

Detailed Description

template<typename PixelT>
class lsst::meas::algorithms::evalChi2Visitor< PixelT >

A class to pass around to all our PsfCandidates to evaluate the PSF fit's X^2.

Definition at line 449 of file SpatialModelPsf.cc.

Member Typedef Documentation

template<typename PixelT>

typedef afwImage::Exposure<PixelT> lsst::meas::algorithms::evalChi2Visitor< PixelT >::Exposure

private

Definition at line 452 of file SpatialModelPsf.cc.

template<typename PixelT>

typedef afwImage::Image<PixelT> lsst::meas::algorithms::evalChi2Visitor< PixelT >::Image

private

Definition at line 450 of file SpatialModelPsf.cc.

template<typename PixelT>

typedef afwImage::Image<afwMath::Kernel::Pixel> lsst::meas::algorithms::evalChi2Visitor< PixelT >::KImage

private

Definition at line 454 of file SpatialModelPsf.cc.

template<typename PixelT>

typedef afwImage::MaskedImage<PixelT> lsst::meas::algorithms::evalChi2Visitor< PixelT >::MaskedImage

private

Definition at line 451 of file SpatialModelPsf.cc.

Constructor & Destructor Documentation

template<typename PixelT>

lsst::meas::algorithms::evalChi2Visitor< PixelT >::evalChi2Visitor ( afwMath::Kernel const &  kernel, double  lambda  )

inlineexplicit

Definition at line 456 of file SpatialModelPsf.cc.

                              :
        afwMath::CandidateVisitor(),
        _chi2(0.0), _kernel(kernel), _lambda(lambda),
        _kImage(KImage::Ptr(new KImage(kernel.getDimensions()))) {
    }

Member Function Documentation

template<typename PixelT>

double lsst::meas::algorithms::evalChi2Visitor< PixelT >::getValue ( ) const

inline

Definition at line 506 of file SpatialModelPsf.cc.

{ return _chi2; }

template<typename PixelT>

void lsst::meas::algorithms::evalChi2Visitor< PixelT >::processCandidate ( afwMath::SpatialCellCandidate *  candidate )

inlinevirtual

Reimplemented from lsst::afw::math::CandidateVisitor.

Definition at line 469 of file SpatialModelPsf.cc.

                                                                  {
        PsfCandidate<PixelT> *imCandidate = dynamic_cast<PsfCandidate<PixelT> *>(candidate);
        if (imCandidate == NULL) {
            throw LSST_EXCEPT(lsst::pex::exceptions::LogicError,
                              "Failed to cast SpatialCellCandidate to PsfCandidate");
        }
        
        double const xcen = imCandidate->getSource()->getX();
        double const ycen = imCandidate->getSource()->getY();

        _kernel.computeImage(*_kImage, true, xcen, ycen);
        typename MaskedImage::ConstPtr data;
        try {
            data = imCandidate->getOffsetImage(WARP_ALGORITHM, WARP_BUFFER);
        } catch(lsst::pex::exceptions::LengthError &) {
            return;
        }
        
        try {
            std::pair<double, double> result = fitKernel(*_kImage, *data, _lambda, false,
                                                         imCandidate->getSource()->getId());
            
            double dchi2 = result.first;      // chi^2 from this object
            double const amp = result.second; // estimate of amplitude of model at this point
            
            imCandidate->setChi2(dchi2);
            imCandidate->setAmplitude(amp);
            
            _chi2 += dchi2;
        } catch(lsst::pex::exceptions::RangeError &e) {
            imCandidate->setStatus(afwMath::SpatialCellCandidate::BAD);
            imCandidate->setChi2(std::numeric_limits<double>::quiet_NaN());
            imCandidate->setAmplitude(std::numeric_limits<double>::quiet_NaN());
        }
    }

template<typename PixelT>

void lsst::meas::algorithms::evalChi2Visitor< PixelT >::reset ( )

inlinevirtual

Reimplemented from lsst::afw::math::CandidateVisitor.

Definition at line 464 of file SpatialModelPsf.cc.

                 {
        _chi2 = 0.0;
    }

Member Data Documentation

template<typename PixelT>

double lsst::meas::algorithms::evalChi2Visitor< PixelT >::_chi2

mutableprivate

Definition at line 509 of file SpatialModelPsf.cc.

template<typename PixelT>

afwMath::Kernel const& lsst::meas::algorithms::evalChi2Visitor< PixelT >::_kernel

private

Definition at line 510 of file SpatialModelPsf.cc.

template<typename PixelT>

KImage::Ptr lsst::meas::algorithms::evalChi2Visitor< PixelT >::_kImage

mutableprivate

Definition at line 512 of file SpatialModelPsf.cc.

template<typename PixelT>

double lsst::meas::algorithms::evalChi2Visitor< PixelT >::_lambda

private

Definition at line 511 of file SpatialModelPsf.cc.

---

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

• /home/lsstsw/stack/Linux64/meas_algorithms/11.0-2-gb8b8ce7/src/SpatialModelPsf.cc