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DM-33888: Add config parameter to grow streak footprints #639

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merged 2 commits into from
Apr 6, 2022
Merged

DM-33888: Add config parameter to grow streak footprints #639

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17cb6ff
Add config parameter to grow streak footprints
yalsayyad Mar 2, 2022
d97a310
Add padding around detected streak masks
cmsaunders Mar 3, 2022
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12 changes: 12 additions & 0 deletions python/lsst/pipe/tasks/assembleCoadd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2012,6 +2012,11 @@ class CompareWarpAssembleCoaddConfig(AssembleCoaddConfig,
dtype=bool,
default=False
)
growStreakFp = pexConfig.Field(
doc="Grow streak footprints by this number multiplied by the PSF width",
dtype=float,
default=5
)

def setDefaults(self):
AssembleCoaddConfig.setDefaults(self)
Expand Down Expand Up @@ -2417,6 +2422,13 @@ def findArtifacts(self, templateCoadd, tempExpRefList, imageScalerList):
streakMask = warpDiffExp.mask
spanSetStreak = afwGeom.SpanSet.fromMask(streakMask,
streakMask.getPlaneBitMask(maskName)).split()
# Pad the streaks to account for low-surface brightness wings
psf = warpDiffExp.getPsf()
for s, sset in enumerate(spanSetStreak):
psfShape = psf.computeShape(sset.computeCentroid())
dilation = self.config.growStreakFp * psfShape.getDeterminantRadius()
sset_dilated = sset.dilated(int(dilation))
spanSetStreak[s] = sset_dilated

# PSF-Matched warps have less available area (~the matching kernel) because the calexps
# undergo a second convolution. Pixels with data in the direct warp
Expand Down