Classes
class	CachingPsf

class	DeblendedParent

class	DeblendedPeak

class	DeblenderResult

class	MultiColorPeak

Functions
	deblend (footprint, maskedImage, psf, psffwhm, psfChisqCut1=1.5, psfChisqCut2=1.5, psfChisqCut2b=1.5, fitPsfs=True, medianSmoothTemplate=True, medianFilterHalfsize=2, monotonicTemplate=True, weightTemplates=False, log=None, verbose=False, sigma1=None, maxNumberOfPeaks=0, assignStrayFlux=True, strayFluxToPointSources='necessary', strayFluxAssignment='r-to-peak', rampFluxAtEdge=False, patchEdges=False, tinyFootprintSize=2, getTemplateSum=False, clipStrayFluxFraction=0.001, clipFootprintToNonzero=True, removeDegenerateTemplates=False, maxTempDotProd=0.5)

	newDeblend (debPlugins, footprint, mMaskedImage, psfs, psfFwhms, log=None, verbose=False, avgNoise=None, maxNumberOfPeaks=0)

Variables
list	DEFAULT_PLUGINS

Function Documentation

◆ deblend()

lsst.meas.deblender.baseline.deblend	(	footprint,
		maskedImage,
		psf,
		psffwhm,
		psfChisqCut1 = 1.5,
		psfChisqCut2 = 1.5,
		psfChisqCut2b = 1.5,
		fitPsfs = True,
		medianSmoothTemplate = True,
		medianFilterHalfsize = 2,
		monotonicTemplate = True,
		weightTemplates = False,
		log = None,
		verbose = False,
		sigma1 = None,
		maxNumberOfPeaks = 0,
		assignStrayFlux = True,
		strayFluxToPointSources = 'necessary',
		strayFluxAssignment = 'r-to-peak',
		rampFluxAtEdge = False,
		patchEdges = False,
		tinyFootprintSize = 2,
		getTemplateSum = False,
		clipStrayFluxFraction = 0.001,
		clipFootprintToNonzero = True,
		removeDegenerateTemplates = False,
		maxTempDotProd = 0.5 )

Deblend a parent ``Footprint`` in a ``MaskedImageF``.

Deblending assumes that ``footprint`` has multiple peaks, as it will still create a
`PerFootprint` object with a list of peaks even if there is only one peak in the list.
It is recommended to first check that ``footprint`` has more than one peak, similar to the
execution of `lsst.meas.deblender.deblend.SourceDeblendTask`.

.. note::
This is the API for the old deblender, however the function builds the plugins necessary
to use the new deblender to perform identically to the old deblender.
To test out newer functionality use ``newDeblend`` instead.

Deblending involves several mandatory and optional steps:

# Optional: If ``fitPsfs`` is True, find all peaks that are well-fit by a PSF + background model

* Peaks that pass the cuts have their footprints modified to the PSF + background model
and their ``deblendedAsPsf`` property set to ``True``.
* Relevant parameters: ``psfChisqCut1``, ``psfChisqCut2``, ``psfChisqCut2b``,
``tinyFootprintSize``.
* See the parameter descriptions for more.

# Build a symmetric template for each peak not well-fit by the PSF model

* Given ``maskedImageF``, ``footprint``, and a ``DeblendedPeak``, creates a symmetric
template (``templateImage`` and ``templateFootprint``) around the peak
for all peaks not flagged as ``skip`` or ``deblendedAsPsf``.
* If ``patchEdges=True`` and if ``footprint`` touches pixels with the
``EDGE`` bit set, then ``footprint`` is grown to include spans whose
symmetric mirror is outside of the image.
* Relevant parameters: ``sigma1`` and ``patchEdges``.

# Optional: If ``rampFluxAtEdge`` is True, adjust flux on the edges of the template footprints

* Using the PSF, a peak ``Footprint`` with pixels on the edge of of ``footprint``
is grown by the psffwhm*1.5 and filled in with zeros.
* The result is a new symmetric footprint template for the peaks near the edge.
* Relevant parameter: ``patchEdges``.

# Optionally (``medianSmoothTemplate=True``) filter the template images

* Apply a median smoothing filter to all of the template images.
* Relevant parameters: ``medianFilterHalfSize``

# Optional: If ``monotonicTemplate`` is True, make the templates monotonic.

* The pixels in the templates are modified such that pixels
further from the peak will have values smaller than those closer to the peak.

# Optional: If ``clipFootprintToNonzero`` is True, clip non-zero spans in the template footprints

* Peak ``Footprint``\ s are clipped to the region in the image containing non-zero values
by dropping spans that are completely zero and moving endpoints to non-zero pixels
(but does not split spans that have internal zeros).

# Optional: If ``weightTemplates`` is True, weight the templates to best fit the observed image

* Re-weight the templates so that their linear combination
best represents the observed ``maskedImage``

# Optional: If ``removeDegenerateTempaltes`` is True, reconstruct shredded galaxies

* If galaxies have substructure, such as face-on spirals, the process of identifying peaks can
"shred" the galaxy into many pieces. The templates of shredded galaxies are typically quite
similar because they represent the same galaxy, so we try to identify these "degenerate" peaks
by looking at the inner product (in pixel space) of pairs of templates.
* If they are nearly parallel, we only keep one of the peaks and reject the other.
* If only one of the peaks is a PSF template, the other template is used,
otherwise the one with the maximum template value is kept.
* Relevant parameters: ``maxTempDotProduct``

# Apportion flux to all of the peak templates

* Divide the ``maskedImage`` flux amongst all of the templates based on the fraction of
flux assigned to each ``tempalteFootprint``.
* Leftover "stray flux" is assigned to peaks based on the other parameters.
* Relevant parameters: ``clipStrayFluxFraction``, ``strayFluxAssignment``,
``strayFluxToPointSources``, ``assignStrayFlux``

Parameters
----------
footprint: `afw.detection.Footprint`
Parent footprint to deblend
maskedImage: `afw.image.MaskedImageF`
Masked image containing the ``footprint``
psf: `afw.detection.Psf`
Psf of the ``maskedImage``
psffwhm: `float`
FWHM of the ``maskedImage``\'s ``psf``
psfChisqCut*: `float`, optional
If ``fitPsfs==True``, all of the peaks are fit to the image PSF.
``psfChisqCut1`` is the maximum chi-squared-per-degree-of-freedom allowed for a peak to
be considered a PSF match without recentering.
A fit is also made that includes terms to recenter the PSF.
``psfChisqCut2`` is the same as ``psfChisqCut1`` except it determines the restriction on the
fit that includes recentering terms.
If the peak is a match for a re-centered PSF, the PSF is repositioned at the new center and
the peak footprint is fit again, this time to the new PSF.
If the resulting chi-squared-per-degree-of-freedom is less than ``psfChisqCut2b`` then it
passes the re-centering algorithm.
If the peak passes both the re-centered and fixed position cuts, the better of the two is accepted,
but parameters for all three psf fits are stored in the ``DeblendedPeak``.
The default for ``psfChisqCut1``, ``psfChisqCut2``, and ``psfChisqCut2b`` is ``1.5``.
fitPsfs: `bool`, optional
If True then all of the peaks will be compared to the image PSF to
distinguish stars from galaxies.
medianSmoothTemplate: ``bool``, optional
If ``medianSmoothTemplate==True`` it a median smoothing filter is applied to the ``maskedImage``.
The default is ``True``.
medianFilterHalfSize: `int`, optional
Half the box size of the median filter, ie a ``medianFilterHalfSize`` of 50 means that
each output pixel will be the median of the pixels in a 101 x 101-pixel box in the input image.
This parameter is only used when ``medianSmoothTemplate==True``, otherwise it is ignored.
The default value is 2.
monotonicTempalte: `bool`, optional
If True then make the template monotonic.
The default is True.
weightTemplates: `bool`, optional
If True, re-weight the templates so that their linear combination best represents
the observed ``maskedImage``.
The default is False.
log: `log.Log`, optional
LSST logger for logging purposes.
The default is ``None`` (no logging).
verbose: `bool`, optional
Whether or not to show a more verbose output.
The default is ``False``.
sigma1: `float`, optional
Average noise level in ``maskedImage``.
The default is ``None``, which estimates the noise from the median value of ``maskedImage``.
maxNumberOfPeaks: `int`, optional
If nonzero, the maximum number of peaks to deblend.
If the total number of peaks is greater than ``maxNumberOfPeaks``,
then only the first ``maxNumberOfPeaks`` sources are deblended.
The default is 0, which deblends all of the peaks.
assignStrayFlux: `bool`, optional
If True then flux in the parent footprint that is not covered by any of the
template footprints is assigned to templates based on their 1/(1+r^2) distance.
How the flux is apportioned is determined by ``strayFluxAssignment``.
The default is True.
strayFluxToPointSources: `string`
Determines how stray flux is apportioned to point sources

* ``never``: never apportion stray flux to point sources
* ``necessary`` (default): point sources are included only if there are no extended sources nearby
* ``always``: point sources are always included in the 1/(1+r^2) splitting

strayFluxAssignment: `string`, optional
Determines how stray flux is apportioned.

* ``trim``: Trim stray flux and do not include in any footprints
* ``r-to-peak`` (default): Stray flux is assigned based on (1/(1+r^2) from the peaks
* ``r-to-footprint``: Stray flux is distributed to the footprints based on 1/(1+r^2) of the
minimum distance from the stray flux to footprint
* ``nearest-footprint``: Stray flux is assigned to the footprint with lowest L-1 (Manhattan)
distance to the stray flux

rampFluxAtEdge: `bool`, optional
If True then extend footprints with excessive flux on the edges as described above.
The default is False.
patchEdges: `bool`, optional
If True and if the footprint touches pixels with the ``EDGE`` bit set,
then grow the footprint to include all symmetric templates.
The default is ``False``.
tinyFootprintSize: `float`, optional
The PSF model is shrunk to the size that contains the original footprint.
If the bbox of the clipped PSF model for a peak is smaller than ``max(tinyFootprintSize,2)``
then ``tinyFootprint`` for the peak is set to ``True`` and the peak is not fit.
The default is 2.
getTemplateSum: `bool`, optional
As part of the flux calculation, the sum of the templates is calculated.
If ``getTemplateSum==True`` then the sum of the templates is stored in the result (a `PerFootprint`).
The default is False.
clipStrayFluxFraction: `float`, optional
Minimum stray-flux portion.
Any stray-flux portion less than ``clipStrayFluxFraction`` is clipped to zero.
The default is 0.001.
clipFootprintToNonzero: `bool`, optional
If True then clip non-zero spans in the template footprints. See above for more.
The default is True.
removeDegenerateTemplates: `bool`, optional
If True then we try to identify "degenerate" peaks by looking at the inner product
(in pixel space) of pairs of templates.
The default is False.
maxTempDotProduct: `float`, optional
All dot products between templates greater than ``maxTempDotProduct`` will result in one
of the templates removed. This parameter is only used when ``removeDegenerateTempaltes==True``.
The default is 0.5.

Returns
-------
res: `PerFootprint`
Deblender result that contains a list of ``DeblendedPeak``\ s for each peak and (optionally)
the template sum.

Definition at line 430 of file baseline.py.

            ):
    r"""Deblend a parent ``Footprint`` in a ``MaskedImageF``.
 
    Deblending assumes that ``footprint`` has multiple peaks, as it will still create a
    `PerFootprint` object with a list of peaks even if there is only one peak in the list.
    It is recommended to first check that ``footprint`` has more than one peak, similar to the
    execution of `lsst.meas.deblender.deblend.SourceDeblendTask`.
 
    .. note::
        This is the API for the old deblender, however the function builds the plugins necessary
        to use the new deblender to perform identically to the old deblender.
        To test out newer functionality use ``newDeblend`` instead.
 
    Deblending involves several mandatory and optional steps:
 
    # Optional: If ``fitPsfs`` is True, find all peaks that are well-fit by a PSF + background model
 
        * Peaks that pass the cuts have their footprints modified to the PSF + background model
          and their ``deblendedAsPsf`` property set to ``True``.
        * Relevant parameters: ``psfChisqCut1``, ``psfChisqCut2``, ``psfChisqCut2b``,
          ``tinyFootprintSize``.
        * See the parameter descriptions for more.
 
    # Build a symmetric template for each peak not well-fit by the PSF model
 
        * Given ``maskedImageF``, ``footprint``, and a ``DeblendedPeak``, creates a symmetric
          template (``templateImage`` and ``templateFootprint``) around the peak
          for all peaks not flagged as ``skip`` or ``deblendedAsPsf``.
        * If ``patchEdges=True`` and if ``footprint`` touches pixels with the
          ``EDGE`` bit set, then ``footprint`` is grown to include spans whose
          symmetric mirror is outside of the image.
        * Relevant parameters: ``sigma1`` and ``patchEdges``.
 
    # Optional: If ``rampFluxAtEdge`` is True, adjust flux on the edges of the template footprints
 
        * Using the PSF, a peak ``Footprint`` with pixels on the edge of of ``footprint``
          is grown by the psffwhm*1.5 and filled in with zeros.
        * The result is a new symmetric footprint template for the peaks near the edge.
        * Relevant parameter: ``patchEdges``.
 
    # Optionally (``medianSmoothTemplate=True``) filter the template images
 
        * Apply a median smoothing filter to all of the template images.
        * Relevant parameters: ``medianFilterHalfSize``
 
    # Optional: If ``monotonicTemplate`` is True, make the templates monotonic.
 
        * The pixels in the templates are modified such that pixels
          further from the peak will have values smaller than those closer to the peak.
 
    # Optional: If ``clipFootprintToNonzero`` is True, clip non-zero spans in the template footprints
 
        * Peak ``Footprint``\ s are clipped to the region in the image containing non-zero values
          by dropping spans that are completely zero and moving endpoints to non-zero pixels
          (but does not split spans that have internal zeros).
 
    # Optional: If ``weightTemplates`` is True,  weight the templates to best fit the observed image
 
        * Re-weight the templates so that their linear combination
          best represents the observed ``maskedImage``
 
    # Optional: If ``removeDegenerateTempaltes`` is True, reconstruct shredded galaxies
 
        * If galaxies have substructure, such as face-on spirals, the process of identifying peaks can
          "shred" the galaxy into many pieces. The templates of shredded galaxies are typically quite
          similar because they represent the same galaxy, so we try to identify these "degenerate" peaks
          by looking at the inner product (in pixel space) of pairs of templates.
        * If they are nearly parallel, we only keep one of the peaks and reject the other.
        * If only one of the peaks is a PSF template, the other template is used,
          otherwise the one with the maximum template value is kept.
        * Relevant parameters: ``maxTempDotProduct``
 
    # Apportion flux to all of the peak templates
 
        * Divide the ``maskedImage`` flux amongst all of the templates based on the fraction of
          flux assigned to each ``tempalteFootprint``.
        * Leftover "stray flux" is assigned to peaks based on the other parameters.
        * Relevant parameters: ``clipStrayFluxFraction``, ``strayFluxAssignment``,
          ``strayFluxToPointSources``, ``assignStrayFlux``
 
    Parameters
    ----------
    footprint: `afw.detection.Footprint`
        Parent footprint to deblend
    maskedImage: `afw.image.MaskedImageF`
        Masked image containing the ``footprint``
    psf: `afw.detection.Psf`
        Psf of the ``maskedImage``
    psffwhm: `float`
        FWHM of the ``maskedImage``\'s ``psf``
    psfChisqCut*: `float`, optional
        If ``fitPsfs==True``, all of the peaks are fit to the image PSF.
        ``psfChisqCut1`` is the maximum chi-squared-per-degree-of-freedom allowed for a peak to
        be considered a PSF match without recentering.
        A fit is also made that includes terms to recenter the PSF.
        ``psfChisqCut2`` is the same as ``psfChisqCut1`` except it determines the restriction on the
        fit that includes recentering terms.
        If the peak is a match for a re-centered PSF, the PSF is repositioned at the new center and
        the peak footprint is fit again, this time to the new PSF.
        If the resulting chi-squared-per-degree-of-freedom is less than ``psfChisqCut2b`` then it
        passes the re-centering algorithm.
        If the peak passes both the re-centered and fixed position cuts, the better of the two is accepted,
        but parameters for all three psf fits are stored in the ``DeblendedPeak``.
        The default for ``psfChisqCut1``, ``psfChisqCut2``, and ``psfChisqCut2b`` is ``1.5``.
    fitPsfs: `bool`, optional
        If True then all of the peaks will be compared to the image PSF to
        distinguish stars from galaxies.
    medianSmoothTemplate: ``bool``, optional
        If ``medianSmoothTemplate==True`` it a median smoothing filter is applied to the ``maskedImage``.
        The default is ``True``.
    medianFilterHalfSize: `int`, optional
        Half the box size of the median filter, ie a ``medianFilterHalfSize`` of 50 means that
        each output pixel will be the median of  the pixels in a 101 x 101-pixel box in the input image.
        This parameter is only used when ``medianSmoothTemplate==True``, otherwise it is ignored.
        The default value is 2.
    monotonicTempalte: `bool`, optional
        If True then make the template monotonic.
        The default is True.
    weightTemplates: `bool`, optional
        If True, re-weight the templates so that their linear combination best represents
        the observed ``maskedImage``.
        The default is False.
    log: `log.Log`, optional
        LSST logger for logging purposes.
        The default is ``None`` (no logging).
    verbose: `bool`, optional
        Whether or not to show a more verbose output.
        The default is ``False``.
    sigma1: `float`, optional
        Average noise level in ``maskedImage``.
        The default is ``None``, which estimates the noise from the median value of ``maskedImage``.
    maxNumberOfPeaks: `int`, optional
        If nonzero, the maximum number of peaks to deblend.
        If the total number of peaks is greater than ``maxNumberOfPeaks``,
        then only the first ``maxNumberOfPeaks`` sources are deblended.
        The default is 0, which deblends all of the peaks.
    assignStrayFlux: `bool`, optional
        If True then flux in the parent footprint that is not covered by any of the
        template footprints is assigned to templates based on their 1/(1+r^2) distance.
        How the flux is apportioned is determined by ``strayFluxAssignment``.
        The default is True.
    strayFluxToPointSources: `string`
        Determines how stray flux is apportioned to point sources
 
        * ``never``: never apportion stray flux to point sources
        * ``necessary`` (default): point sources are included only if there are no extended sources nearby
        * ``always``: point sources are always included in the 1/(1+r^2) splitting
 
    strayFluxAssignment: `string`, optional
        Determines how stray flux is apportioned.
 
        * ``trim``: Trim stray flux and do not include in any footprints
        * ``r-to-peak`` (default): Stray flux is assigned based on (1/(1+r^2) from the peaks
        * ``r-to-footprint``: Stray flux is distributed to the footprints based on 1/(1+r^2) of the
          minimum distance from the stray flux to footprint
        * ``nearest-footprint``: Stray flux is assigned to the footprint with lowest L-1 (Manhattan)
          distance to the stray flux
 
    rampFluxAtEdge: `bool`, optional
        If True then extend footprints with excessive flux on the edges as described above.
        The default is False.
    patchEdges: `bool`, optional
        If True and if the footprint touches pixels with the ``EDGE`` bit set,
        then grow the footprint to include all symmetric templates.
        The default is ``False``.
    tinyFootprintSize: `float`, optional
        The PSF model is shrunk to the size that contains the original footprint.
        If the bbox of the clipped PSF model for a peak is smaller than ``max(tinyFootprintSize,2)``
        then ``tinyFootprint`` for the peak is set to ``True`` and the peak is not fit.
        The default is 2.
    getTemplateSum: `bool`, optional
        As part of the flux calculation, the sum of the templates is calculated.
        If ``getTemplateSum==True`` then the sum of the templates is stored in the result (a `PerFootprint`).
        The default is False.
    clipStrayFluxFraction: `float`, optional
        Minimum stray-flux portion.
        Any stray-flux portion less than ``clipStrayFluxFraction`` is clipped to zero.
        The default is 0.001.
    clipFootprintToNonzero: `bool`, optional
        If True then clip non-zero spans in the template footprints. See above for more.
        The default is True.
    removeDegenerateTemplates: `bool`, optional
        If True then we try to identify "degenerate" peaks by looking at the inner product
        (in pixel space) of pairs of templates.
        The default is False.
    maxTempDotProduct: `float`, optional
        All dot products between templates greater than ``maxTempDotProduct`` will result in one
        of the templates removed. This parameter is only used when ``removeDegenerateTempaltes==True``.
        The default is 0.5.
 
    Returns
    -------
    res: `PerFootprint`
        Deblender result that contains a list of ``DeblendedPeak``\ s for each peak and (optionally)
        the template sum.
    """
    avgNoise = sigma1
 
    debPlugins = []
 
    # Add activated deblender plugins
    if fitPsfs:
        debPlugins.append(plugins.DeblenderPlugin(plugins.fitPsfs,
                                                  psfChisqCut1=psfChisqCut1,
                                                  psfChisqCut2=psfChisqCut2,
                                                  psfChisqCut2b=psfChisqCut2b,
                                                  tinyFootprintSize=tinyFootprintSize))
    debPlugins.append(plugins.DeblenderPlugin(plugins.buildSymmetricTemplates, patchEdges=patchEdges))
    if rampFluxAtEdge:
        debPlugins.append(plugins.DeblenderPlugin(plugins.rampFluxAtEdge, patchEdges=patchEdges))
    if medianSmoothTemplate:
        debPlugins.append(plugins.DeblenderPlugin(plugins.medianSmoothTemplates,
                                                  medianFilterHalfsize=medianFilterHalfsize))
    if monotonicTemplate:
        debPlugins.append(plugins.DeblenderPlugin(plugins.makeTemplatesMonotonic))
    if clipFootprintToNonzero:
        debPlugins.append(plugins.DeblenderPlugin(plugins.clipFootprintsToNonzero))
    if weightTemplates:
        debPlugins.append(plugins.DeblenderPlugin(plugins.weightTemplates))
    if removeDegenerateTemplates:
        if weightTemplates:
            onReset = len(debPlugins)-1
        else:
            onReset = len(debPlugins)
        debPlugins.append(plugins.DeblenderPlugin(plugins.reconstructTemplates,
                                                  onReset=onReset,
                                                  maxTempDotProd=maxTempDotProd))
    debPlugins.append(plugins.DeblenderPlugin(plugins.apportionFlux,
                                              clipStrayFluxFraction=clipStrayFluxFraction,
                                              assignStrayFlux=assignStrayFlux,
                                              strayFluxAssignment=strayFluxAssignment,
                                              strayFluxToPointSources=strayFluxToPointSources,
                                              getTemplateSum=getTemplateSum))
 
    debResult = newDeblend(debPlugins, footprint, maskedImage, psf, psffwhm, log, verbose, avgNoise)
 
    return debResult
 
 

◆ newDeblend()

lsst.meas.deblender.baseline.newDeblend	(	debPlugins,
		footprint,
		mMaskedImage,
		psfs,
		psfFwhms,
		log = None,
		verbose = False,
		avgNoise = None,
		maxNumberOfPeaks = 0 )

Deblend a parent ``Footprint`` in a ``MaskedImageF``.

Deblending assumes that ``footprint`` has multiple peaks, as it will still create a
`PerFootprint` object with a list of peaks even if there is only one peak in the list.
It is recommended to first check that ``footprint`` has more than one peak, similar to the
execution of `lsst.meas.deblender.deblend.SourceDeblendTask`.

This version of the deblender accepts a list of plugins to execute, with the option to re-run parts
of the deblender if templates are changed during any of the steps.

Parameters
----------
debPlugins: list of `meas.deblender.plugins.DeblenderPlugins`
Plugins to execute (in order of execution) for the deblender.
footprint: `afw.detection.Footprint` or list of Footprints
Parent footprint to deblend.
mMaskedImage: `MultibandMaskedImage` or `MaskedImage`
Masked image in each band.
psfs: `afw.detection.Psf` or list of Psfs
Psf of the ``maskedImage``.
psfFwhms: `float` or list of floats
FWHM of the ``maskedImage``\'s ``psf``.
log: `log.Log`, optional
LSST logger for logging purposes.
The default is ``None`` (no logging).
verbose: `bool`, optional
Whether or not to show a more verbose output.
The default is ``False``.
avgNoise: `float`or list of `float`\ s, optional
Average noise level in each ``maskedImage``.
The default is ``None``, which estimates the noise from the median value of the
variance plane of ``maskedImage`` for each filter.
maxNumberOfPeaks: `int`, optional
If nonzero, the maximum number of peaks to deblend.
If the total number of peaks is greater than ``maxNumberOfPeaks``,
then only the first ``maxNumberOfPeaks`` sources are deblended.

Returns
-------
debResult: `DeblendedParent`
Deblender result that contains a list of ``MultiColorPeak``\ s for each peak and
information that describes the footprint in all filters.

Definition at line 678 of file baseline.py.

               log=None, verbose=False, avgNoise=None, maxNumberOfPeaks=0):
    r"""Deblend a parent ``Footprint`` in a ``MaskedImageF``.
 
    Deblending assumes that ``footprint`` has multiple peaks, as it will still create a
    `PerFootprint` object with a list of peaks even if there is only one peak in the list.
    It is recommended to first check that ``footprint`` has more than one peak, similar to the
    execution of `lsst.meas.deblender.deblend.SourceDeblendTask`.
 
    This version of the deblender accepts a list of plugins to execute, with the option to re-run parts
    of the deblender if templates are changed during any of the steps.
 
    Parameters
    ----------
    debPlugins: list of `meas.deblender.plugins.DeblenderPlugins`
        Plugins to execute (in order of execution) for the deblender.
    footprint: `afw.detection.Footprint` or list of Footprints
        Parent footprint to deblend.
    mMaskedImage: `MultibandMaskedImage` or `MaskedImage`
        Masked image in each band.
    psfs: `afw.detection.Psf` or list of Psfs
        Psf of the ``maskedImage``.
    psfFwhms: `float` or list of floats
        FWHM of the ``maskedImage``\'s ``psf``.
    log: `log.Log`, optional
        LSST logger for logging purposes.
        The default is ``None`` (no logging).
    verbose: `bool`, optional
        Whether or not to show a more verbose output.
        The default is ``False``.
    avgNoise: `float`or list of `float`\ s, optional
        Average noise level in each ``maskedImage``.
        The default is ``None``, which estimates the noise from the median value of the
        variance plane of ``maskedImage`` for each filter.
    maxNumberOfPeaks: `int`, optional
        If nonzero, the maximum number of peaks to deblend.
        If the total number of peaks is greater than ``maxNumberOfPeaks``,
        then only the first ``maxNumberOfPeaks`` sources are deblended.
 
    Returns
    -------
    debResult: `DeblendedParent`
        Deblender result that contains a list of ``MultiColorPeak``\ s for each peak and
        information that describes the footprint in all filters.
    """
    # Import C++ routines
 
    if log is None:
        import lsst.log as lsstLog
 
        log = lsstLog.Log.getLogger(__name__)
 
        if verbose:
            log.setLevel(lsstLog.Log.TRACE)
 
    # get object that will hold our results
    debResult = DeblenderResult(footprint, mMaskedImage, psfs, psfFwhms, log,
                                maxNumberOfPeaks=maxNumberOfPeaks, avgNoise=avgNoise)
 
    step = 0
    while step < len(debPlugins):
        # If a failure occurs at any step,
        # the result is flagged as `failed`
        # and the remaining steps are skipped
        if not debResult.failed:
            reset = debPlugins[step].run(debResult, log)
        else:
            log.warning("Skipping steps %s", debPlugins[step:])
            return debResult
        if reset:
            step = debPlugins[step].onReset
        else:
            step += 1
 
    return debResult
 
 

Variable Documentation

◆ DEFAULT_PLUGINS

list lsst.meas.deblender.baseline.DEFAULT_PLUGINS

Initial value:

=  [
    plugins.DeblenderPlugin(plugins.fitPsfs),
    plugins.DeblenderPlugin(plugins.buildSymmetricTemplates),
    plugins.DeblenderPlugin(plugins.medianSmoothTemplates),
    plugins.DeblenderPlugin(plugins.makeTemplatesMonotonic),
    plugins.DeblenderPlugin(plugins.clipFootprintsToNonzero),
    plugins.DeblenderPlugin(plugins.reconstructTemplates, onReset=5),
    plugins.DeblenderPlugin(plugins.apportionFlux),
]

Definition at line 36 of file baseline.py.

Classes

Functions

Variables

Function Documentation

◆ deblend()

◆ newDeblend()

Variable Documentation

◆ DEFAULT_PLUGINS