Coverage for tests/test_negative.py: 17%
109 statements
« prev ^ index » next coverage.py v7.3.2, created at 2023-12-03 11:03 +0000
« prev ^ index » next coverage.py v7.3.2, created at 2023-12-03 11:03 +0000
1# This file is part of meas_algorithms.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
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#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
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
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <https://www.gnu.org/licenses/>.
22import unittest
24import lsst.geom
25import lsst.afw.math as afwMath
26import lsst.afw.table as afwTable
27import lsst.daf.base as dafBase
28from lsst.meas.algorithms import SourceDetectionTask
29from lsst.meas.base import SingleFrameMeasurementTask as SourceMeasurementTask
30from lsst.meas.algorithms.testUtils import plantSources
31import lsst.utils.tests
33try:
34 display
35except NameError:
36 display = False
37else:
38 import lsst.afw.display as afwDisplay
39 afwDisplay.setDefaultMaskTransparency(75)
42class NegativeMeasurementTestCase(lsst.utils.tests.TestCase):
43 """Testing detection and measurement on negative objects.
44 """
46 def _create_exposure(self):
47 bbox = lsst.geom.Box2I(lsst.geom.Point2I(256, 100), lsst.geom.Extent2I(128, 127))
48 minCounts = 2000
49 maxCounts = 20000
50 starSigma = 1.5
51 numX = 4
52 numY = 4
53 coordList = self.makeCoordList(
54 bbox=bbox,
55 numX=numX,
56 numY=numY,
57 minCounts=minCounts,
58 maxCounts=maxCounts,
59 sigma=starSigma,
60 )
61 kwid = 11
62 sky = 2000
63 addPoissonNoise = True
64 exposure = plantSources(bbox=bbox, kwid=kwid, sky=sky, coordList=coordList,
65 addPoissonNoise=addPoissonNoise)
66 return exposure, numX, numY
68 def test_detection_stdev(self):
69 """Test detection and measurement on an exposure with negative sources
70 for thresholdType="stdev".
71 """
72 exposure, numX, numY = self._create_exposure()
74 if display:
75 disp = afwDisplay.Display(frame=1)
76 disp.mtv(exposure, title=self._testMethodName + ": image with -ve sources")
78 schema = afwTable.SourceTable.makeMinimalSchema()
79 config = SourceDetectionTask.ConfigClass()
80 config.reEstimateBackground = False
81 config.thresholdType = "stdev"
82 config.thresholdPolarity = 'both'
83 detection = SourceDetectionTask(config=config, schema=schema)
84 algMetadata = dafBase.PropertyList()
85 measurement = SourceMeasurementTask(schema=schema, algMetadata=algMetadata)
87 table = afwTable.SourceTable.make(schema)
88 detections = detection.run(table, exposure)
89 sources = detections.sources
91 self.assertEqual(len(sources), numX*numY)
92 self.assertEqual(detections.numPos, numX*numY/2)
93 self.assertEqual(detections.numNeg, numX*numY/2)
95 measurement.run(sources, exposure)
97 nGoodCent = 0
98 nGoodShape = 0
99 for s in sources:
100 cent = s.getCentroid()
101 shape = s.getShape()
103 if cent[0] == cent[0] and cent[1] == cent[1]:
104 nGoodCent += 1
106 if (shape.getIxx() == shape.getIxx()
107 and shape.getIyy() == shape.getIyy()
108 and shape.getIxy() == shape.getIxy()):
109 nGoodShape += 1
111 if display:
112 xy = cent[0], cent[1]
113 disp.dot('+', *xy)
114 disp.dot(shape, *xy, ctype=afwDisplay.RED)
116 self.assertEqual(nGoodCent, numX*numY)
117 self.assertEqual(nGoodShape, numX*numY)
119 def test_significance(self):
120 """Test that negative peaks have the right significance for
121 thresholdType='stdev' for the non-convolved, non-local-background case.
122 """
123 exposure, numX, numY = self._create_exposure()
125 schema = afwTable.SourceTable.makeMinimalSchema()
126 config = SourceDetectionTask.ConfigClass()
127 config.thresholdType = "stdev"
128 config.thresholdPolarity = 'both'
129 # don't modify the image after detection.
130 config.reEstimateBackground = False
131 config.doTempLocalBackground = False
132 detection = SourceDetectionTask(config=config, schema=schema)
133 result = detection.detectFootprints(exposure, doSmooth=False)
135 bad = exposure.mask.getPlaneBitMask(config.statsMask)
136 sctrl = afwMath.StatisticsControl()
137 sctrl.setAndMask(bad)
138 stats = afwMath.makeStatistics(exposure.maskedImage, afwMath.STDEVCLIP, sctrl)
139 stddev = stats.getValue(afwMath.STDEVCLIP)
140 # Don't bother checking positive footprints: those are tested more
141 # thoroughly in test_detection.py.
142 for footprint in result.negative.getFootprints():
143 for peak in footprint.peaks:
144 point = lsst.geom.Point2I(peak.getIx(), peak.getIy())
145 value = exposure.image[point]
146 with self.subTest(str(point)):
147 self.assertFloatsAlmostEqual(peak["significance"],
148 -value/stddev, # S/N for negative peak
149 rtol=1e-7,
150 msg=str(point))
152 def makeCoordList(self, bbox, numX, numY, minCounts, maxCounts, sigma):
153 """Make a coordList for makeExposure.
154 """
155 dX = bbox.getWidth()/float(numX)
156 dY = bbox.getHeight()/float(numY)
157 minX = bbox.getMinX() + (dX/2.0)
158 minY = bbox.getMinY() + (dY/2.0)
159 dCounts = (maxCounts - minCounts)/(numX*numY/2 - 1)
161 coordList = []
162 counts = minCounts
163 for i in range(numX):
164 x = minX + (dX*i)
165 for j in range(numY):
166 y = minY + (dY*j)
167 if j%2 == 0:
168 coordList.append([x, y, counts, sigma])
169 else:
170 coordList.append([x, y, -counts, sigma])
171 counts += dCounts
172 return coordList
175class TestMemory(lsst.utils.tests.MemoryTestCase):
176 pass
179def setup_module(module):
180 lsst.utils.tests.init()
183if __name__ == "__main__": 183 ↛ 184line 183 didn't jump to line 184, because the condition on line 183 was never true
184 lsst.utils.tests.init()
185 unittest.main()