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# 

# LSST Data Management System 

# 

# Copyright 2008-2016 AURA/LSST. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <https://www.lsstcorp.org/LegalNotices/>. 

# 

import unittest 

 

import lsst.utils.tests 

import lsst.afw.detection as afwDetection 

import lsst.afw.image as afwImage 

import lsst.afw.geom as afwGeom 

import lsst.afw.table as afwTable 

import lsst.meas.algorithms as algorithms 

 

#-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 

 

 

class DeblendTestCase(unittest.TestCase): 

"""A test case for deblending""" 

 

def checkDeblender(self): 

try: 

import lsst.meas.deblender 

except ImportError as e: 

self.skipTest("Cannot import lsst.meas.deblender: %s" % e) 

 

def testFailures(self): 

"""Test deblender failure flagging (#2871) 

 

We create a good source which is expected to pass and a bad source 

which is expected to fail because its footprint goes off the image. 

This latter case may not happen in practise, but it is useful for 

checking the plumbing of the deblender. 

""" 

import lsst.meas.deblender as measDeb 

 

self.checkDeblender() 

xGood, yGood = 57, 86 

xBad, yBad = 0, 0 # Required to be in image so we can evaluate the PSF; will put neighbour just outside 

flux = 100.0 

dims = afwGeom.Extent2I(128, 128) 

 

mi = afwImage.MaskedImageF(dims) 

mi.getVariance().set(1.0) 

image = mi.getImage() 

image.set(0) 

image[xGood, yGood, afwImage.LOCAL] = flux 

 

exposure = afwImage.makeExposure(mi) 

psf = algorithms.DoubleGaussianPsf(21, 21, 3.) 

exposure.setPsf(psf) 

 

schema = afwTable.SourceTable.makeMinimalSchema() 

 

config = measDeb.SourceDeblendConfig() 

config.catchFailures = True 

task = measDeb.SourceDeblendTask(schema, config=config) 

 

catalog = afwTable.SourceCatalog(schema) 

 

def makeSource(x, y, offset=-2, size=3.0): 

"""Make a source in the catalog 

 

Two peaks are created: one at the specified 

position, and one offset in x,y. 

The footprint is of the nominated size. 

""" 

src = catalog.addNew() 

spans = afwGeom.SpanSet.fromShape(int(size), offset=(x, y)) 

foot = afwDetection.Footprint(spans) 

foot.addPeak(x, y, flux) 

foot.addPeak(x + offset, y + offset, flux) 

src.setFootprint(foot) 

return src 

 

good = makeSource(xGood, yGood) 

bad = makeSource(xBad, yBad) 

 

task.run(exposure, catalog) 

 

self.assertFalse(good.get('deblend_failed')) 

self.assertTrue(bad.get('deblend_failed')) 

 

#-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 

 

 

class TestMemory(lsst.utils.tests.MemoryTestCase): 

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

111 ↛ 112line 111 didn't jump to line 112, because the condition on line 111 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()