stella.adapter

Class ModelDrift

java.lang.Object

util.PropertyContainer

stella.adapter.AbstractPinholeShift

stella.adapter.AbstractPinholeModel

stella.adapter.ModelDrift

All Implemented Interfaces:

Cloneable, PinholeShift, Initializable, PropertySupplying

public class ModelDrift
extends AbstractPinholeModel

Class that determines the pixel shift between pinhole and star plus the pinhole drift to the zero position, all by modelling the star plus pinhole. The star is a proportional to the Moffat function,

 psf(r)=(β-1)/πα²[1+(r/α)²]-β,
 

where FWHM = 2α√(2^1/β-1).
Subtracted from that is a pinhole, which is modeled with an arctan according to

 ph(r)=1+(atan(k*(x-FWHM/2))-atan(k*(x+FWHM/2)))/π,
 

where bigger k's mean steeper slope. Additionally to the shift of the pinhole, we also get a hold on the seeing and total flux of the star.

This class is similar to ModelShift, but it goes a step further and also models pinhole movements. This can only be used on very high S/N date.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ModelDrift.PinholeDrift A pinhole model is the model of a star with fitted intensity and FWHM close to the fixed pinhole position at the given coordinates.
static class	ModelDrift.Test Test class.

Nested classes/interfaces inherited from class stella.adapter.AbstractPinholeModel

AbstractPinholeModel.AbstractPinholeFits

Nested classes/interfaces inherited from class stella.adapter.AbstractPinholeShift

AbstractPinholeShift.Background, AbstractPinholeShift.Evaluate, AbstractPinholeShift.Reconstruct

Field Summary

Fields

Modifier and Type	Field and Description
private static double	DEFMOFFATBETA The moffat-beta, 4.765 is literature value.
private static double	DEFPINHOLEDEEP Broad-band anti-reflective coating, typically.
private static double	DEFPINHOLESIZE Default size (FWHM) of pinhole, pixel.
private static double	DEFPINHOLESTEEP Pinhole model steepness.
private static boolean	DEFUSESIMPLEX Default we are not using simplex.
static String	KEY_MOFFATBETA The moffat-beta, 4.765 is literature value.
static String	KEY_PINHOLEDEEP The pinhole model minimum transmission .
static String	KEY_PINHOLESIZE The pinhole diameter.
static String	KEY_PINHOLESTEEP The pinhole model steepness .
static String	KEY_USESIMPLEX If false, we use Levenberg-Marquardt algorithm, otherwise Simplex.

Fields inherited from class stella.adapter.AbstractPinholeModel

fit, KEY_MU, KEY_PIXELSCALE

Fields inherited from class stella.adapter.AbstractPinholeShift

KEY_ADNOISE, KEY_APPLICABLE, KEY_GAIN, KEY_PINHOLE, KEY_SIGMACLIP, KEY_SKYTHICK

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Constructor Summary

Constructors

Constructor and Description
ModelDrift(Map<String,String> prop) Constructs a model-shift.

Method Summary

Modifier and Type	Method and Description
protected AbstractPinholeModel.AbstractPinholeFits	generatePinholeModel(MImageHDU hdu, Rectangle frame, double back, double backerr, Point2D pinhole) This method intializes the pinhole model used in the fitting process during AbstractPinholeModel.initFiberView(fits.hdu.MFits).
Vector2D	getBackground(MImageHDU hdu) This method calculates the background as the median of a frame at the outer edge of the applicable window.
double	getFlux() Returns the total flux from the last solution, if possible.
double	getFwhm() Returns the fwhm from the last solution, if possible.
Point2D	getPinholePosition() Returns the pinhole position.
Point2D	getStarPosition() Returns the star position.
Point2D	initFiberView(MFits ccd) Returns the center of gravity shift of the image from the pinhole position.

Methods inherited from class stella.adapter.AbstractPinholeModel

getBox, getGnuPlotLines, getMeasures, getModel, getModel, getRelativeStarModel, getRemainingFlux, getResiduals, getRms, getSolution, getStarModel, solveFiberView, sumup

Methods inherited from class stella.adapter.AbstractPinholeShift

backgroundFrameMean, backgroundFrameMedian, backgroundMean, backgroundMedian, getAduSignal, getApplicableWindow, getSignalToNoise, init

Methods inherited from class util.PropertyContainer

augment, augment, augment, augment, augment, clone, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, initProperties, isNew, parseObject, parseObject, reload, reload, removeProperty, requires, rescanned, setObject, setProperties, setProperty, stringProperties, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

KEY_MOFFATBETA

public static final String KEY_MOFFATBETA

The moffat-beta, 4.765 is literature value.

See Also:

Constant Field Values

KEY_PINHOLESIZE

public static final String KEY_PINHOLESIZE

The pinhole diameter.

See Also:

Constant Field Values

KEY_PINHOLESTEEP

public static final String KEY_PINHOLESTEEP

The pinhole model steepness .

See Also:

Constant Field Values

KEY_PINHOLEDEEP

public static final String KEY_PINHOLEDEEP

The pinhole model minimum transmission .

See Also:

Constant Field Values

KEY_USESIMPLEX

public static final String KEY_USESIMPLEX

If false, we use Levenberg-Marquardt algorithm, otherwise Simplex.

See Also:

Constant Field Values

DEFMOFFATBETA

private static final double DEFMOFFATBETA

The moffat-beta, 4.765 is literature value.

See Also:

Constant Field Values

DEFPINHOLESIZE

private static final double DEFPINHOLESIZE

Default size (FWHM) of pinhole, pixel.

See Also:

Constant Field Values

DEFPINHOLESTEEP

private static final double DEFPINHOLESTEEP

Pinhole model steepness.

See Also:

Constant Field Values

DEFPINHOLEDEEP

private static final double DEFPINHOLEDEEP

Broad-band anti-reflective coating, typically.

See Also:

Constant Field Values

DEFUSESIMPLEX

private static final boolean DEFUSESIMPLEX

Default we are not using simplex.

See Also:

Constant Field Values

Constructor Detail

ModelDrift

public ModelDrift(Map<String,String> prop)

Constructs a model-shift.

Method Detail

getBackground

public Vector2D getBackground(MImageHDU hdu)

This method calculates the background as the median of a frame at the outer edge of the applicable window.

Returns:

The background ADU in x and its ADU-sigma in y.

generatePinholeModel

protected AbstractPinholeModel.AbstractPinholeFits generatePinholeModel(MImageHDU hdu,
                                                                        Rectangle frame,
                                                                        double back,
                                                                        double backerr,
                                                                        Point2D pinhole)
                                                                 throws BasicFitsException

Description copied from class: AbstractPinholeModel

This method intializes the pinhole model used in the fitting process during AbstractPinholeModel.initFiberView(fits.hdu.MFits). We supply the image data, the applicable image rectangle, the background estimate plus its error and the zero-order pinhole position.

Specified by:

generatePinholeModel in class AbstractPinholeModel

Throws:

BasicFitsException

initFiberView

public Point2D initFiberView(MFits ccd)

Returns the center of gravity shift of the image from the pinhole position. The true center of gravity is scaled with two functions to return true shifts.

Specified by:

initFiberView in interface PinholeShift

Overrides:

initFiberView in class AbstractPinholeModel

Parameters:

ccd - The image of the pinhole entrance

Returns:

The pixel shift from the pinhole center to the star in a first model.

getPinholePosition

public Point2D getPinholePosition()

Returns the pinhole position.

Specified by:

getPinholePosition in interface PinholeShift

Overrides:

getPinholePosition in class AbstractPinholeShift

getStarPosition

public Point2D getStarPosition()

Returns the star position.

Specified by:

getStarPosition in class AbstractPinholeModel

getFlux

public double getFlux()

Returns the total flux from the last solution, if possible.

Specified by:

getFlux in interface PinholeShift

Overrides:

getFlux in class AbstractPinholeShift

getFwhm

public double getFwhm()

Returns the fwhm from the last solution, if possible.

Specified by:

getFwhm in interface PinholeShift

Overrides:

getFwhm in class AbstractPinholeShift