Coverage for tests/test_undeblended.py: 17%
113 statements
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« prev ^ index » next coverage.py v7.2.6, created at 2023-05-27 02:20 -0700
1# This file is part of meas_base.
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5# (https://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
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11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
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17# GNU General Public License for more details.
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22"""Tests for measuring sources on undeblended images.
23"""
25import sys
26import unittest
27import warnings
29import numpy as np
31import lsst.geom
32import lsst.afw.image as afwImage
33import lsst.afw.table as afwTable
34import lsst.afw.geom as afwGeom
35import lsst.afw.detection as afwDetection
36import lsst.afw.math as afwMath
37import lsst.meas.base as measBase
38import lsst.utils.tests
41class UndeblendedTestCase(lsst.utils.tests.TestCase):
42 def testUndeblendedMeasurement(self):
43 """Check undeblended measurement and aperture correction.
44 """
45 width, height = 100, 100 # Dimensions of image
46 x0, y0 = 1234, 5678 # Offset of image
47 radius = 3.0 # Aperture radius
49 # Position of first source; integer values, for convenience
50 xCenter, yCenter = width//2, height//2
51 xOffset, yOffset = 1, 1 # Offset from first source to second source
52 instFlux1, instFlux2 = 1000, 1 # Flux of sources
53 apCorrValue = 3.21 # Aperture correction value to apply
55 image = afwImage.MaskedImageF(lsst.geom.ExtentI(width, height))
56 image.setXY0(x0, y0)
57 image.getVariance().set(1.0)
59 schema = afwTable.SourceTable.makeMinimalSchema()
60 schema.addField("centroid_x", type=np.float64)
61 schema.addField("centroid_y", type=np.float64)
62 schema.addField("centroid_flag", type='Flag')
63 schema.getAliasMap().set("slot_Centroid", "centroid")
65 with warnings.catch_warnings():
66 warnings.filterwarnings("ignore", message="ignoreSlotPluginChecks", category=FutureWarning)
67 sfmConfig = measBase.SingleFrameMeasurementConfig(ignoreSlotPluginChecks=True)
68 algName = "base_CircularApertureFlux"
70 for subConfig in (sfmConfig.plugins, sfmConfig.undeblended):
71 subConfig.names = [algName]
72 subConfig[algName].radii = [radius]
73 # Disable sinc photometry because we're undersampled
74 subConfig[algName].maxSincRadius = 0
75 slots = sfmConfig.slots
76 slots.centroid = "centroid"
77 slots.shape = None
78 slots.psfShape = None
79 slots.apFlux = None
80 slots.modelFlux = None
81 slots.psfFlux = None
82 slots.gaussianFlux = None
83 slots.calibFlux = None
85 fieldName = lsst.meas.base.CircularApertureFluxAlgorithm.makeFieldPrefix(algName, radius)
86 measBase.addApCorrName(fieldName)
88 apCorrConfig = measBase.ApplyApCorrConfig()
89 apCorrConfig.proxies = {"undeblended_" + fieldName: fieldName}
91 sfm = measBase.SingleFrameMeasurementTask(config=sfmConfig, schema=schema)
92 apCorr = measBase.ApplyApCorrTask(config=apCorrConfig, schema=schema)
94 cat = afwTable.SourceCatalog(schema)
95 parent = cat.addNew()
96 parent.set("centroid_x", x0 + xCenter)
97 parent.set("centroid_y", y0 + yCenter)
98 spanSetParent = afwGeom.SpanSet.fromShape(int(radius))
99 spanSetParent = spanSetParent.shiftedBy(x0 + xCenter, y0 + yCenter)
100 parent.setFootprint(afwDetection.Footprint(spanSetParent))
102 # First child is bright, dominating the blend
103 child1 = cat.addNew()
104 child1.set("centroid_x", parent.get("centroid_x"))
105 child1.set("centroid_y", parent.get("centroid_y"))
106 child1.setParent(parent.getId())
107 image[xCenter, yCenter, afwImage.LOCAL] = (instFlux1, 0, 0)
108 spanSetChild1 = afwGeom.SpanSet.fromShape(1)
109 spanSetChild1 = spanSetChild1.shiftedBy(x0 + xCenter, y0 + yCenter)
110 foot1 = afwDetection.Footprint(spanSetChild1)
111 child1.setFootprint(afwDetection.HeavyFootprintF(foot1, image))
113 # Second child is fainter, but we want to be able to measure it!
114 child2 = cat.addNew()
115 child2.set("centroid_x", parent.get("centroid_x") + xOffset)
116 child2.set("centroid_y", parent.get("centroid_y") + yOffset)
117 child2.setParent(parent.getId())
118 image[xCenter + xOffset, yCenter + yOffset, afwImage.LOCAL] = (instFlux2, 0, 0)
119 spanSetChild2 = afwGeom.SpanSet.fromShape(1)
120 tmpPoint = (x0 + xCenter + xOffset, y0 + yCenter + yOffset)
121 spanSetChild2 = spanSetChild2.shiftedBy(*tmpPoint)
122 foot2 = afwDetection.Footprint(spanSetChild2)
123 child2.setFootprint(afwDetection.HeavyFootprintF(foot2, image))
125 spans = foot1.spans.union(foot2.spans)
126 bbox = lsst.geom.Box2I()
127 bbox.include(foot1.getBBox())
128 bbox.include(foot2.getBBox())
129 parent.setFootprint(afwDetection.Footprint(spans, bbox))
131 exposure = afwImage.makeExposure(image)
133 sfm.run(cat, exposure)
135 def checkSource(source, baseName, expectedFlux):
136 """Check that we get the expected results.
137 """
138 self.assertEqual(source.get(baseName + "_instFlux"), expectedFlux)
139 self.assertGreater(source.get(baseName + "_instFluxErr"), 0)
140 self.assertFalse(source.get(baseName + "_flag"))
142 # Deblended
143 checkSource(child1, fieldName, instFlux1)
144 checkSource(child2, fieldName, instFlux2)
146 # Undeblended
147 checkSource(child1, "undeblended_" + fieldName, instFlux1 + instFlux2)
148 checkSource(child2, "undeblended_" + fieldName, instFlux1 + instFlux2)
150 # Apply aperture correction
151 apCorrMap = afwImage.ApCorrMap()
152 apCorrMap[fieldName + "_instFlux"] = afwMath.ChebyshevBoundedField(
153 image.getBBox(),
154 apCorrValue*np.ones((1, 1), dtype=np.float64)
155 )
156 apCorrMap[fieldName + "_instFluxErr"] = afwMath.ChebyshevBoundedField(
157 image.getBBox(),
158 apCorrValue*np.zeros((1, 1), dtype=np.float64)
159 )
161 apCorr.run(cat, apCorrMap)
163 # Deblended
164 checkSource(child1, fieldName, instFlux1*apCorrValue)
165 checkSource(child2, fieldName, instFlux2*apCorrValue)
167 # Undeblended
168 checkSource(child1, "undeblended_" + fieldName, (instFlux1 + instFlux2)*apCorrValue)
169 checkSource(child2, "undeblended_" + fieldName, (instFlux1 + instFlux2)*apCorrValue)
171 self.assertIn(fieldName + "_apCorr", schema)
172 self.assertIn(fieldName + "_apCorrErr", schema)
173 self.assertIn("undeblended_" + fieldName + "_apCorr", schema)
174 self.assertIn("undeblended_" + fieldName + "_apCorrErr", schema)
177class TestMemory(lsst.utils.tests.MemoryTestCase):
178 pass
181def setup_module(module):
182 lsst.utils.tests.init()
185if __name__ == "__main__": 185 ↛ 186line 185 didn't jump to line 186, because the condition on line 185 was never true
186 setup_module(sys.modules[__name__])
187 unittest.main()