stella.adapter
Class ModelShift

java.lang.Object
  util.PropertyContainer
      util.PropertyResources
          util.PropertyBundles
              stella.adapter.AbstractPinholeShift
                  stella.adapter.ModelShift

All Implemented Interfaces:

Cloneable, PinholeShift, Initializable, LocalizedSupplying, PropertySupplying, ResourceSupplying

public class ModelShift
extends AbstractPinholeShift

Class that determines the pixel shift between pinhole and star 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, but no hold on pinhole drifts.

Nested Class Summary

static class	ModelShift.PinholeModel 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	ModelShift.Test Test class.

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

AbstractPinholeShift.Background, AbstractPinholeShift.Evaluate, AbstractPinholeShift.Reconstruct

Nested classes/interfaces inherited from class util.PropertyResources

PropertyResources.URLResource

Field Summary

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.
private VectorG	last The last solution.

Fields inherited from class stella.adapter.AbstractPinholeShift

KEY_ADNOISE, KEY_APPLICABLE, KEY_GAIN, KEY_PINHOLE, KEY_SIGMACLIP, KEY_SKYTHICK

Fields inherited from class util.PropertyBundles

KEY_LOCALECOUNTRY, KEY_LOCALELANGUAGE, KEY_RESOURCEBUNDLES

Fields inherited from class util.PropertyResources

KEY_NOINITONCREATE, localurl, locate, POSTFIX_DIR, POSTFIX_EXT, POSTFIX_FILE, POSTFIX_LIST, POSTFIX_URL, urlset

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.ResourceSupplying

KEY_URLRESOURCES, KEY_URLUSECONFIG, KEY_URLUSECURRENT, KEY_URLUSEHOME

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Constructor Summary

ModelShift(Map<String,String> prop)
Constructs a model-shift.

Method Summary

Vector2D	getBackground(nom.tam.fits.ImageHDU hdu) This method calculates the background as the median of a frame at the outer edge of the apllicable 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	initFiberView(nom.tam.fits.Fits ccd) Returns the center of gravity shift of the image from the pinhole position.

Methods inherited from class stella.adapter.AbstractPinholeShift

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

Methods inherited from class util.PropertyBundles

clone, getLocalized, getLocalized, getLocalizedString, getLocalizedString, loadResource

Methods inherited from class util.PropertyResources

createFrom, createFrom, createFrom, getApplet, getAsResources, getLocalClassLoader, getPropertiesToKey, getPropertiesToKey, getResource, getResourceAsStream, getResourceFromKey, getResources, keyCreate, keyCreate, reload, setApplet

Methods inherited from class util.PropertyContainer

augment, augment, augment, 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, isNew, parseObject, reload, removeProperty, rescanned, setObject, setProperties, setProperty, stringProperties, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface util.ResourceSupplying

getResource, getResourceAsStream, getResources

Methods inherited from interface util.PropertySupplying

defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, parseObject, removeProperty, setObject, setProperty, stringProperties

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

last

private VectorG last

The last solution.

Constructor Detail

ModelShift

public ModelShift(Map<String,String> prop)

Constructs a model-shift.

Method Detail

getBackground

public Vector2D getBackground(nom.tam.fits.ImageHDU hdu)

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

Returns:

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

initFiberView

public Point2D initFiberView(nom.tam.fits.Fits 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.

Parameters:

ccd - The image of the pinhole entrance

Returns:

The pixel shift from the pinhole center to the star.

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