Inheritance diagram for lsst.pipe.tasks.background.MaskObjectsTask:

Public Member Functions
	__init__ (self, args, *kwargs)

	run (self, exposure, maskPlanes=None)

	findObjects (self, exposure)

	removeObjects (self, exposure, maskPlanes=None)

Static Public Attributes
	ConfigClass = MaskObjectsConfig

Detailed Description

Iterative masking of objects on an Exposure

This task makes more exhaustive object mask by iteratively doing detection
and background-subtraction. The purpose of this task is to get true
background removing faint tails of large objects. This is useful to get a
clean sky estimate from relatively small number of visits.

We deliberately use the specified ``detectSigma`` instead of the PSF,
in order to better pick up the faint wings of objects.

Definition at line 803 of file background.py.

Constructor & Destructor Documentation

◆ init()

lsst.pipe.tasks.background.MaskObjectsTask.__init__	(		self,
		*	args,
		**	kwargs )

Definition at line 816 of file background.py.

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Disposable schema suppresses warning from SourceDetectionTask.__init__
        self.makeSubtask("detection", schema=afwTable.Schema())
        self.makeSubtask("interpolate")
        self.makeSubtask("subtractBackground")
 

Member Function Documentation

◆ findObjects()

lsst.pipe.tasks.background.MaskObjectsTask.findObjects	(		self,
			exposure )

Iteratively find objects on an exposure

Objects are masked with the ``DETECTED`` mask plane.

Parameters
----------
exposure : `lsst.afw.image.Exposure`
    Exposure on which to mask objects.

Definition at line 838 of file background.py.

    def findObjects(self, exposure):
        """Iteratively find objects on an exposure
 
        Objects are masked with the ``DETECTED`` mask plane.
 
        Parameters
        ----------
        exposure : `lsst.afw.image.Exposure`
            Exposure on which to mask objects.
        """
        for _ in range(self.config.nIter):
            bg = self.subtractBackground.run(exposure).background
            self.detection.detectFootprints(exposure, sigma=self.config.detectSigma, clearMask=True)
            exposure.maskedImage += bg.getImage()
 

◆ removeObjects()

lsst.pipe.tasks.background.MaskObjectsTask.removeObjects	(	self,
		exposure,
		maskPlanes = None )

Remove objects from exposure

We interpolate over using a background model if ``doInterpolate`` is
set; otherwise we simply replace everything with the median.

Parameters
----------
exposure : `lsst.afw.image.Exposure`
    Exposure on which to mask objects.
maskPlanes : iterable of `str`, optional
    List of mask planes to remove. ``DETECTED`` will be added as well.

Definition at line 853 of file background.py.

    def removeObjects(self, exposure, maskPlanes=None):
        """Remove objects from exposure
 
        We interpolate over using a background model if ``doInterpolate`` is
        set; otherwise we simply replace everything with the median.
 
        Parameters
        ----------
        exposure : `lsst.afw.image.Exposure`
            Exposure on which to mask objects.
        maskPlanes : iterable of `str`, optional
            List of mask planes to remove. ``DETECTED`` will be added as well.
        """
        image = exposure.image
        mask = exposure.mask
        maskVal = mask.getPlaneBitMask("DETECTED")
        if maskPlanes is not None:
            maskVal |= mask.getPlaneBitMask(maskPlanes)
        isBad = mask.array & maskVal > 0
 
        if self.config.doInterpolate:
            smooth = self.interpolate.fitBackground(exposure.maskedImage)
            replace = smooth.getImageF().array[isBad]
            mask.array &= ~mask.getPlaneBitMask(["DETECTED"])
        else:
            replace = numpy.median(image.array[~isBad])
        image.array[isBad] = replace
 
 

◆ run()

lsst.pipe.tasks.background.MaskObjectsTask.run	(	self,
		exposure,
		maskPlanes = None )

Mask objects on Exposure

Objects are found and removed.

Parameters
----------
exposure : `lsst.afw.image.Exposure`
    Exposure on which to mask objects.
maskPlanes : iterable of `str`, optional
    List of mask planes to remove.

Definition at line 823 of file background.py.

    def run(self, exposure, maskPlanes=None):
        """Mask objects on Exposure
 
        Objects are found and removed.
 
        Parameters
        ----------
        exposure : `lsst.afw.image.Exposure`
            Exposure on which to mask objects.
        maskPlanes : iterable of `str`, optional
            List of mask planes to remove.
        """
        self.findObjects(exposure)
        self.removeObjects(exposure, maskPlanes)
 

Member Data Documentation

◆ ConfigClass

lsst.pipe.tasks.background.MaskObjectsTask.ConfigClass = MaskObjectsConfig

static

Definition at line 814 of file background.py.

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

/j/snowflake/release/lsstsw/stack/lsst-scipipe-8.0.0/Linux64/pipe_tasks/gc07e1c2157+a98bf949bb/python/lsst/pipe/tasks/background.py

Public Member Functions

Static Public Attributes