FocussingMoments

java.lang.Object
- util.PropertyContainer
- - util.PropertyResources
  - - stella.adapter.AdapterUnit
    - - stella.adapter.FocussingUnit
      - stella.adapter.FocussingMoments

All Implemented Interfaces:

Cloneable, Abortable, Initializable, PropertySupplying, ResourceSupplying

Direct Known Subclasses:

LinearPrimeFocus, MirrorFocus
```
public abstract class FocussingMoments
extends FocussingUnit
implements Abortable
```
This class uses maximization of ADU moments to obtain a best focus. Its mechanism of offsetting the focus are unspecified, but a CCD must be present in order to obtain images from which ADU statistics can be drawn. Additionally, a method must be present that allows a crude estimate of the focus position. This can be done with a temperature model, but any other mechanism is allowed, as long as it adheres to #crudeFocus.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class FocussingMoments.Zernike
From a recorded Zernike fits, call scanA4.
- Nested classes/interfaces inherited from class util.PropertyResources
  PropertyResources.Load, PropertyResources.URLResource

Nested Classes
Modifier and Type	Class and Description
`static class`	`FocussingMoments.Zernike` From a recorded Zernike fits, call scanA4.

Field Summary

Fields
Modifier and Type	Field and Description
`private static String`	`A4MOM`
`private static String`	`A4MOMREM`
`private boolean`	`abort` Abort ongoing focus sequence.
`private static double`	`DEFA4ERROR` Default A4 error (2011-10-14).
`private static double`	`DEFA4SLOPE` Default A4 slope (2011-10-14).
`private static Dimension`	`DEFADUSIZE` The default size around the bright spot.
`private static Rectangle`	`DEFBLOBFRAME` The default blob frame.
`private static Dimension`	`DEFBLOBSIZE` The default blob size.
`private static double`	`DEFCOARSEACCEPT` Default always do sequence.
`private static boolean`	`DEFDOSAVE` If true we save the indivdual images during focus.
`private static boolean`	`DEFDOSEARCH` If temperature model is accurate enough, we can skip the search.
`private static double`	`DEFERRORCRUDE` Default temperature focusing error in steps.
`private static double`	`DEFEXPOSEFOCUS` The default S/N on acquire.
`private static Dimension`	`DEFFOCUSBINNING` The default binning on acquire.
`private static int`	`DEFFOCUSORDER` The moment during fine focus.
`private static String`	`DEFFWHMMEASURE` Default fwhm measure parameter name.
`private static Dimension`	`DEFFWHMSIZE` The default size around the bright spot.
`private static double`	`DEFHIGHSKYSIGMA` Per default we do not do ADU rejection, thus this is zero.
`private static double`	`DEFLOWSKYSIGMA` Per default we do not do ADU rejection, thus this is zero.
`private static boolean`	`DEFMEDIANSKY` Default we use median for sky-level determination.
`private static String`	`DEFMOMENTS` Default focus temperature parameter name.
`private static int`	`DEFSEARCHORDER` The moment during coarse focus.
`private static int`	`DEFSEARCHSTEPS` Default half-number of search steps.
`private static int`	`DEFSKYFRAME` The defautl sky frame size.
`private static double`	`DEFZERNIKEACCEPT` Default always do sequence.
`private static double`	`DEFZERNIKESTEP` Default no extra Zernike images.
`private static double`	`DEFZEXPOSE` Default no extra increase in exposure time on Zernikes.
`private long`	`exptms` The exposure time in ms calculated once per focus sequence.
`static String`	`EXTRAFOCAL` Extension for extrafocal image in Zernike coefficient determination.
`private static String`	`FOCMOM`
`private static String`	`FOCMOMREM`
`private static String`	`FWHMGAUSS`
`private static String`	`FWHMGAUSSREM`
`static String`	`INTRAFOCAL` Extension for intrafocal image in Zernike coefficient determination.
`static String`	`KEY_A4ERROR` This is the error estimate for A4 slope.
`static String`	`KEY_A4SLOPE` This is the slope of A4 versus steps.
`static String`	`KEY_ADUSIZE` The box to scan for A4.
`static String`	`KEY_BLOBFRAME` The frame for searching blobs, smaller than image frame.
`static String`	`KEY_BLOBSIZE` The default blob size.
`static String`	`KEY_COARSEACCEPT` If the coarse error is below this, we spare the sequence.
`static String`	`KEY_DOSAVE` Save the focus sequence images.
`static String`	`KEY_DOSEARCH` Once the temperature model is accurate enough, we do not search.
`static String`	`KEY_ERRORCRUDE` Estimated focussing error on crude focus.
`static String`	`KEY_EXPOSEFOCUS` The S/N for focus.
`static String`	`KEY_FOCUSBINNING` The binnning for focus images.
`static String`	`KEY_FOCUSFRAME` The frame for focus images.
`static String`	`KEY_FOCUSOFFSET` The offset from the optimal focus for image 1&2.
`static String`	`KEY_FOCUSORDER` The moment during fine focus.
`static String`	`KEY_FWHMMEASURE` The name of the fwhm measurement parameter to use.
`static String`	`KEY_FWHMSIZE` The box to scan for fwhm.
`static String`	`KEY_HIGHSKYSIGMA` If greather than zero, the high bound sigma for background rejection.
`static String`	`KEY_LOWSKYSIGMA` If greather than zero, the low-bound sigma for background rejection.
`static String`	`KEY_MAXFOCUSEXPOSE` If the exposure time required for moments exceed this, do T only.
`static String`	`KEY_MEDIANSKY` If true, use median in background frame.
`static String`	`KEY_MOMENTS` The name of the fits moments to use.
`static String`	`KEY_MOMENTSFRAME` The frame for focus moments, smaller than image frame.
`static String`	`KEY_SEARCHOFFSET` The step width, if focus model is bad.
`static String`	`KEY_SEARCHORDER` The moment during coarse focus.
`static String`	`KEY_SEARCHSTEPS` The number of search steps in either direction.
`static String`	`KEY_SKYFRAME` The default sky frame size.
`static String`	`KEY_ZERNIKEACCEPT` If the zernike error is below this, we spare the sequence.
`static String`	`KEY_ZERNIKESTEP` If this multiplier to searchsteps is greater 0, we do Zernikes.
`static String`	`KEY_ZEXPOSE` Multiplier to nominal exposure time for extra/intra focal Zernike.
`private FwhmMeasure`	`measfwhm` We also measure the FWHM in the final focus image.
`private FitsMoments`	`moments` The fits-moments parameter.
`static String`	`SEARCH` If the mode quals search, we always do an extensive search.
`private static String`	`SETFOCUS`
`private static String`	`SETFOCUSREM`

Fields inherited from class stella.adapter.FocussingUnit
increase

Fields inherited from class stella.adapter.AdapterUnit
ACQUIRETYPE, GUIDERTYPE, PYRAMIDTYPE

Fields inherited from class util.PropertyResources
KEY_NOINITONCREATE, POSTFIX_ALPHABET, POSTFIX_BYTES, POSTFIX_DIR, POSTFIX_EXT, POSTFIX_FILE, POSTFIX_LIST, POSTFIX_MODTIME, POSTFIX_URL

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

Constructors
Modifier Constructor and Description

protected FocussingMoments(Map<String,String> prop)
Constructor chaining.

Constructors
Modifier	Constructor and Description
`protected`	`FocussingMoments(Map<String,String> prop)` Constructor chaining.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`protected ErrorEvent`	`doFocusTask(String mode)` Task of this unit is to auto focus after a successful acquire.
`private Vector2D`	`doZernikes(double zernike, double pos0)` Does Zernike focussing using A4.
`protected abstract double`	`getCrudeFocus()` This method estimates a first crude focus and returns this position in arbitrary units, which my be millimeters or steps or even non-linear units.
`private double`	`getFwhm(MImageHDU f0)`
`abstract double`	`getMaximumFocus()` Returns the maximum focus position to avoid focus underruns.
`abstract double`	`getMinimumFocus()` Returns the minimum focus position to avoid focus underruns.
`private Pair<Double,MImageHDU>`	`getMomentAt(double step, int order)` We position the linear stage at the indicated step, take an image with the CCD camera on the `#KEY_FOCSUFRAME` and calculate the moments of this image.
`protected boolean`	`isValid()` We are valid only if we have the linear drive and the moments.
`private Vector2D`	`limitCoarseFocus()` In the coarse focus, we do a temperature model, even if very inaccurate, then procced to in and out with `#KEY_SEARCH` step, doing a image on the small frame along the offsets.
`private Vector2D`	`limitCrudeFocus()`
`private double`	`scanA4(MImageHDU hdu)` We calculate the A4 parameter from second image moments following Equation 5 in PASP118, 1165, but without pixel scaling.
`void`	`setAbort(boolean to)` Allows the sub-device to abort as soone as possible.
`protected void`	`setMaster(AdapterMaster chef)` From the master, we query the driver for the linear stage and grab the temperature and the fits moments parameter.
`private boolean`	`store(MImageHDU image, String store)`
`private MFits`	`takeSingleImage(CcdDriver ccd, double ms, Dimension bin)` Takes a single image, resets the driver if necessary.

Methods inherited from class stella.adapter.FocussingUnit
setFocus, setFocusOffset, setIncrease

Methods inherited from class stella.adapter.AdapterUnit
doUnitTask, getGuider, getMaster, getTelescope, getUnitType, init, isManual, resetUnit, setGuider, setManual, setTelescope

Methods inherited from class util.PropertyResources
clone, createFrom, createFrom, createFrom, createInstance, getApplet, getAsResources, getLocate, getPropertiesToKey, getPropertiesToKey, getResource, getResourceAsStream, getResourceFromKey, getResources, hasLocalURLs, initProperties, keyCreate, keyCreate, reload, setApplet

Methods inherited from class util.PropertyContainer
augment, augment, 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, parseObject, 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

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
  - A4MOMREM
```
private static final String A4MOMREM
```
    See Also:
    
    Constant Field Values
  - A4MOM
```
private static final String A4MOM
```
    See Also:
    
    Constant Field Values
  - FWHMGAUSSREM
```
private static final String FWHMGAUSSREM
```
    See Also:
    
    Constant Field Values
  - FWHMGAUSS
```
private static final String FWHMGAUSS
```
    See Also:
    
    Constant Field Values
  - FOCMOMREM
```
private static final String FOCMOMREM
```
    See Also:
    
    Constant Field Values
  - FOCMOM
```
private static final String FOCMOM
```
    See Also:
    
    Constant Field Values
  - SETFOCUSREM
```
private static final String SETFOCUSREM
```
    See Also:
    
    Constant Field Values
  - SETFOCUS
```
private static final String SETFOCUS
```
    See Also:
    
    Constant Field Values
  - EXTRAFOCAL
```
public static final String EXTRAFOCAL
```
    Extension for extrafocal image in Zernike coefficient determination.
    
    See Also:
    
    Constant Field Values
  - INTRAFOCAL
```
public static final String INTRAFOCAL
```
    Extension for intrafocal image in Zernike coefficient determination.
    
    See Also:
    
    Constant Field Values
  - SEARCH
```
public static final String SEARCH
```
    If the mode quals search, we always do an extensive search.
    
    See Also:
    
    Constant Field Values
  - KEY_FWHMMEASURE
```
public static final String KEY_FWHMMEASURE
```
    The name of the fwhm measurement parameter to use.
    
    See Also:
    
    Constant Field Values
  - KEY_MOMENTS
```
public static final String KEY_MOMENTS
```
    The name of the fits moments to use.
    
    See Also:
    
    Constant Field Values
  - KEY_FOCUSOFFSET
```
public static final String KEY_FOCUSOFFSET
```
    The offset from the optimal focus for image 1&2.
    
    See Also:
    
    Constant Field Values
  - KEY_FOCUSORDER
```
public static final String KEY_FOCUSORDER
```
    The moment during fine focus.
    
    See Also:
    
    Constant Field Values
  - KEY_SEARCHSTEPS
```
public static final String KEY_SEARCHSTEPS
```
    The number of search steps in either direction.
    
    See Also:
    
    Constant Field Values
  - KEY_SEARCHOFFSET
```
public static final String KEY_SEARCHOFFSET
```
    The step width, if focus model is bad.
    
    See Also:
    
    Constant Field Values
  - KEY_SEARCHORDER
```
public static final String KEY_SEARCHORDER
```
    The moment during coarse focus.
    
    See Also:
    
    Constant Field Values
  - KEY_DOSEARCH
```
public static final String KEY_DOSEARCH
```
    Once the temperature model is accurate enough, we do not search.
    
    See Also:
    
    Constant Field Values
  - KEY_DOSAVE
```
public static final String KEY_DOSAVE
```
    Save the focus sequence images. Always done with String-type ccds.
    
    See Also:
    
    Constant Field Values
  - KEY_FOCUSFRAME
```
public static final String KEY_FOCUSFRAME
```
    The frame for focus images.
    
    See Also:
    
    Constant Field Values
  - KEY_MOMENTSFRAME
```
public static final String KEY_MOMENTSFRAME
```
    The frame for focus moments, smaller than image frame.
    
    See Also:
    
    Constant Field Values
  - KEY_BLOBFRAME
```
public static final String KEY_BLOBFRAME
```
    The frame for searching blobs, smaller than image frame.
    
    See Also:
    
    Constant Field Values
  - KEY_FOCUSBINNING
```
public static final String KEY_FOCUSBINNING
```
    The binnning for focus images.
    
    See Also:
    
    Constant Field Values
  - KEY_EXPOSEFOCUS
```
public static final String KEY_EXPOSEFOCUS
```
    The S/N for focus.
    
    See Also:
    
    Constant Field Values
  - KEY_MAXFOCUSEXPOSE
```
public static final String KEY_MAXFOCUSEXPOSE
```
    If the exposure time required for moments exceed this, do T only.
    
    See Also:
    
    Constant Field Values
  - KEY_ZERNIKESTEP
```
public static final String KEY_ZERNIKESTEP
```
    If this multiplier to searchsteps is greater 0, we do Zernikes.
    
    See Also:
    
    Constant Field Values
  - KEY_ZEXPOSE
```
public static final String KEY_ZEXPOSE
```
    Multiplier to nominal exposure time for extra/intra focal Zernike.
    
    See Also:
    
    Constant Field Values
  - KEY_A4SLOPE
```
public static final String KEY_A4SLOPE
```
    This is the slope of A4 versus steps.
    
    See Also:
    
    Constant Field Values
  - KEY_A4ERROR
```
public static final String KEY_A4ERROR
```
    This is the error estimate for A4 slope.
    
    See Also:
    
    Constant Field Values
  - KEY_BLOBSIZE
```
public static final String KEY_BLOBSIZE
```
    The default blob size.
    
    See Also:
    
    Constant Field Values
  - KEY_ADUSIZE
```
public static final String KEY_ADUSIZE
```
    The box to scan for A4.
    
    See Also:
    
    Constant Field Values
  - KEY_FWHMSIZE
```
public static final String KEY_FWHMSIZE
```
    The box to scan for fwhm.
    
    See Also:
    
    Constant Field Values
  - KEY_SKYFRAME
```
public static final String KEY_SKYFRAME
```
    The default sky frame size.
    
    See Also:
    
    Constant Field Values
  - KEY_MEDIANSKY
```
public static final String KEY_MEDIANSKY
```
    If true, use median in background frame.
    
    See Also:
    
    Constant Field Values
  - KEY_LOWSKYSIGMA
```
public static final String KEY_LOWSKYSIGMA
```
    If greather than zero, the low-bound sigma for background rejection.
    
    See Also:
    
    Constant Field Values
  - KEY_HIGHSKYSIGMA
```
public static final String KEY_HIGHSKYSIGMA
```
    If greather than zero, the high bound sigma for background rejection.
    
    See Also:
    
    Constant Field Values
  - KEY_ZERNIKEACCEPT
```
public static final String KEY_ZERNIKEACCEPT
```
    If the zernike error is below this, we spare the sequence.
    
    See Also:
    
    Constant Field Values
  - KEY_COARSEACCEPT
```
public static final String KEY_COARSEACCEPT
```
    If the coarse error is below this, we spare the sequence.
    
    See Also:
    
    Constant Field Values
  - KEY_ERRORCRUDE
```
public static final String KEY_ERRORCRUDE
```
    Estimated focussing error on crude focus.
    
    See Also:
    
    Constant Field Values
  - DEFMOMENTS
```
private static final String DEFMOMENTS
```
    Default focus temperature parameter name.
    
    See Also:
    
    Constant Field Values
  - DEFFWHMMEASURE
```
private static final String DEFFWHMMEASURE
```
    Default fwhm measure parameter name.
    
    See Also:
    
    Constant Field Values
  - DEFSEARCHSTEPS
```
private static final int DEFSEARCHSTEPS
```
    Default half-number of search steps.
    
    See Also:
    
    Constant Field Values
  - DEFDOSEARCH
```
private static final boolean DEFDOSEARCH
```
    If temperature model is accurate enough, we can skip the search.
    
    See Also:
    
    Constant Field Values
  - DEFDOSAVE
```
private static final boolean DEFDOSAVE
```
    If true we save the indivdual images during focus.
    
    See Also:
    
    Constant Field Values
  - DEFEXPOSEFOCUS
```
private static final double DEFEXPOSEFOCUS
```
    The default S/N on acquire.
    
    See Also:
    
    Constant Field Values
  - DEFSEARCHORDER
```
private static final int DEFSEARCHORDER
```
    The moment during coarse focus.
    
    See Also:
    
    Constant Field Values
  - DEFFOCUSORDER
```
private static final int DEFFOCUSORDER
```
    The moment during fine focus.
    
    See Also:
    
    Constant Field Values
  - DEFFOCUSBINNING
```
private static final Dimension DEFFOCUSBINNING
```
    The default binning on acquire.
  - DEFZERNIKESTEP
```
private static final double DEFZERNIKESTEP
```
    Default no extra Zernike images.
    
    See Also:
    
    Constant Field Values
  - DEFZEXPOSE
```
private static final double DEFZEXPOSE
```
    Default no extra increase in exposure time on Zernikes.
    
    See Also:
    
    Constant Field Values
  - DEFA4SLOPE
```
private static final double DEFA4SLOPE
```
    Default A4 slope (2011-10-14).
    
    See Also:
    
    Constant Field Values
  - DEFA4ERROR
```
private static final double DEFA4ERROR
```
    Default A4 error (2011-10-14).
    
    See Also:
    
    Constant Field Values
  - DEFBLOBFRAME
```
private static final Rectangle DEFBLOBFRAME
```
    The default blob frame.
  - DEFBLOBSIZE
```
private static final Dimension DEFBLOBSIZE
```
    The default blob size.
  - DEFADUSIZE
```
private static final Dimension DEFADUSIZE
```
    The default size around the bright spot.
  - DEFFWHMSIZE
```
private static final Dimension DEFFWHMSIZE
```
    The default size around the bright spot.
  - DEFSKYFRAME
```
private static final int DEFSKYFRAME
```
    The defautl sky frame size.
    
    See Also:
    
    Constant Field Values
  - DEFMEDIANSKY
```
private static final boolean DEFMEDIANSKY
```
    Default we use median for sky-level determination.
    
    See Also:
    
    Constant Field Values
  - DEFLOWSKYSIGMA
```
private static final double DEFLOWSKYSIGMA
```
    Per default we do not do ADU rejection, thus this is zero.
    
    See Also:
    
    Constant Field Values
  - DEFHIGHSKYSIGMA
```
private static final double DEFHIGHSKYSIGMA
```
    Per default we do not do ADU rejection, thus this is zero.
    
    See Also:
    
    Constant Field Values
  - DEFZERNIKEACCEPT
```
private static final double DEFZERNIKEACCEPT
```
    Default always do sequence.
    
    See Also:
    
    Constant Field Values
  - DEFCOARSEACCEPT
```
private static final double DEFCOARSEACCEPT
```
    Default always do sequence.
    
    See Also:
    
    Constant Field Values
  - DEFERRORCRUDE
```
private static final double DEFERRORCRUDE
```
    Default temperature focusing error in steps.
    
    See Also:
    
    Constant Field Values
  - moments
```
private FitsMoments moments
```
    The fits-moments parameter.
  - measfwhm
```
private FwhmMeasure measfwhm
```
    We also measure the FWHM in the final focus image.
  - exptms
```
private long exptms
```
    The exposure time in ms calculated once per focus sequence.
  - abort
```
private boolean abort
```
    Abort ongoing focus sequence.
- Constructor Detail
  - FocussingMoments
```
protected FocussingMoments(Map<String,String> prop)
```
    Constructor chaining.
- Method Detail
  - getMinimumFocus
```
public abstract double getMinimumFocus()
```
    Returns the minimum focus position to avoid focus underruns.
  - getMaximumFocus
```
public abstract double getMaximumFocus()
```
    Returns the maximum focus position to avoid focus underruns.
  - getCrudeFocus
```
protected abstract double getCrudeFocus()
```
    This method estimates a first crude focus and returns this position in arbitrary units, which my be millimeters or steps or even non-linear units. It does not set the focus.
  - setMaster
```
protected void setMaster(AdapterMaster chef)
```
    From the master, we query the driver for the linear stage and grab the temperature and the fits moments parameter.
    
    Overrides:
    
    setMaster in class AdapterUnit
  - isValid
```
protected boolean isValid()
```
    We are valid only if we have the linear drive and the moments.
    
    Overrides:
    
    isValid in class AdapterUnit
  - setAbort
```
public void setAbort(boolean to)
```
    Description copied from interface: Abortable
    
    Allows the sub-device to abort as soone as possible. Does not necessarily block until the sub-device is ready again, but must ensure that the sub-device is ready to proceed with a new task, or, on starting the new task, is not doing the last task. As an example: On a focus sequence, an abort should mean that furhter stepping through the sequences is canceled. If the same CCD is used by an acquire task, a synchronization on the CCD fulfills the requirement above.
    
    Specified by:
    
    setAbort in interface Abortable
  - doFocusTask
```
protected ErrorEvent doFocusTask(String mode)
```
    Task of this unit is to auto focus after a successful acquire. This is done in two steps
  - limitCrudeFocus
```
private Vector2D limitCrudeFocus()
```
  - limitCoarseFocus
```
private Vector2D limitCoarseFocus()
```
    In the coarse focus, we do a temperature model, even if very inaccurate, then procced to in and out with #KEY_SEARCH step, doing a image on the small frame along the offsets. For each image, the value of the KEY_SEARCHORDER moment is recorded, in this list the maximum is found. From this maximum and from its neighbouring values, a parabola is fit through this three points, the maximum is the new focus, which we also set. If the maximum value in the original sequence is at the edge, we return a value slightly inside, depending on the two inner points to the maximum.
    
    Returns:
    
    True on success.
  - doZernikes
```
private Vector2D doZernikes(double zernike,
                            double pos0)
```
    Does Zernike focussing using A4.
  - scanA4
```
private double scanA4(MImageHDU hdu)
               throws BasicFitsException
```
    We calculate the A4 parameter from second image moments following Equation 5 in PASP118, 1165, but without pixel scaling.
```
 A4 = sqrt(Mx+My), with
 Mx,y =
 Σ(x,y_ij-x,y_c)^2*ADU_ij/ΣADU_ij
 
```
    Centered on the brightest pixel blob in the image, we use a rectangle of size KEY_ADUSIZE and around that a #SKYFRAME thick frame for background determination. The background is either the median or the mean of the ADUs in the sky frame, the RMS estimate is either the quartile-sigma or the standard deviation. The two values KEY_LOWSKYSIGMA and KEY_HIGHSKYSIGMA define which range of ADUs should be considered background. This background count is removed from the image prior to calculating the moments.
    Throws:
    
    BasicFitsException
  - getMomentAt
```
private Pair<Double,MImageHDU> getMomentAt(double step,
                                           int order)
```
    We position the linear stage at the indicated step, take an image with the CCD camera on the #KEY_FOCSUFRAME and calculate the moments of this image. The value returned is the indicated central normalized moment, except for 1 that returns the average and 2 returns the square root of the variance. If the positioning fails (or if the requested position is out of range) null is returned.
  - getFwhm
```
private double getFwhm(MImageHDU f0)
```
  - store
```
private boolean store(MImageHDU image,
                      String store)
```
  - takeSingleImage
```
private MFits takeSingleImage(CcdDriver ccd,
                              double ms,
                              Dimension bin)
```
    Takes a single image, resets the driver if necessary. double pow10 = Math. pow(10., Math.floor(Math2.log10(getAsDouble(KEY_FOCUSOFFSET)))); String uu = Unique.tf.format(step/pow10)+fext;

Class FocussingMoments

Nested Class Summary

Nested classes/interfaces inherited from class util.PropertyResources

Field Summary

Fields inherited from class stella.adapter.FocussingUnit

Fields inherited from class stella.adapter.AdapterUnit

Fields inherited from class util.PropertyResources

Fields inherited from class util.PropertyContainer

Fields inherited from interface util.ResourceSupplying

Fields inherited from interface util.PropertySupplying

Constructor Summary

Method Summary

Methods inherited from class stella.adapter.FocussingUnit

Methods inherited from class stella.adapter.AdapterUnit

Methods inherited from class util.PropertyResources

Methods inherited from class util.PropertyContainer

Methods inherited from class java.lang.Object

Methods inherited from interface util.PropertySupplying

Field Detail

A4MOMREM

A4MOM

FWHMGAUSSREM

FWHMGAUSS

FOCMOMREM

FOCMOM

SETFOCUSREM

SETFOCUS

EXTRAFOCAL

INTRAFOCAL

SEARCH

KEY_FWHMMEASURE

KEY_MOMENTS

KEY_FOCUSOFFSET

KEY_FOCUSORDER

KEY_SEARCHSTEPS

KEY_SEARCHOFFSET

KEY_SEARCHORDER

KEY_DOSEARCH

KEY_DOSAVE

KEY_FOCUSFRAME

KEY_MOMENTSFRAME

KEY_BLOBFRAME

KEY_FOCUSBINNING

KEY_EXPOSEFOCUS

KEY_MAXFOCUSEXPOSE

KEY_ZERNIKESTEP

KEY_ZEXPOSE

KEY_A4SLOPE

KEY_A4ERROR

KEY_BLOBSIZE

KEY_ADUSIZE

KEY_FWHMSIZE

KEY_SKYFRAME

KEY_MEDIANSKY

KEY_LOWSKYSIGMA

KEY_HIGHSKYSIGMA

KEY_ZERNIKEACCEPT

KEY_COARSEACCEPT

KEY_ERRORCRUDE

DEFMOMENTS

DEFFWHMMEASURE

DEFSEARCHSTEPS

DEFDOSEARCH

DEFDOSAVE

DEFEXPOSEFOCUS

DEFSEARCHORDER

DEFFOCUSORDER

DEFFOCUSBINNING

DEFZERNIKESTEP

DEFZEXPOSE

DEFA4SLOPE

DEFA4ERROR

DEFBLOBFRAME

DEFBLOBSIZE

DEFADUSIZE

DEFFWHMSIZE

DEFSKYFRAME

DEFMEDIANSKY

DEFLOWSKYSIGMA

DEFHIGHSKYSIGMA