Coverage for tests / test_dipole.py: 14%
243 statements
« prev ^ index » next coverage.py v7.13.5, created at 2026-05-07 08:35 +0000
1# This file is part of ip_diffim.
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
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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.
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22import unittest
24import numpy as np
26import lsst.utils.tests
27import lsst.daf.base as dafBase
28import lsst.afw.image as afwImage
29import lsst.afw.table as afwTable
30import lsst.afw.math as afwMath
31import lsst.geom as geom
32import lsst.meas.algorithms as measAlg
33import lsst.ip.diffim as ipDiffim
35display = False
36try:
37 display
38except NameError:
39 display = False
40else:
41 import lsst.afw.display as afwDisplay
42 afwDisplay.setDefaultMaskTransparency(75)
44sigma2fwhm = 2.*np.sqrt(2.*np.log(2.))
47def makePluginAndCat(alg, name, control, metadata=False, centroid=None):
48 schema = afwTable.SourceTable.makeMinimalSchema()
49 if centroid:
50 schema.addField(centroid + "_x", type=float)
51 schema.addField(centroid + "_y", type=float)
52 schema.addField(centroid + "_flag", type='Flag')
53 schema.getAliasMap().set("slot_Centroid", centroid)
54 if metadata:
55 plugin = alg(control, name, schema, dafBase.PropertySet())
56 else:
57 plugin = alg(control, name, schema)
58 cat = afwTable.SourceCatalog(schema)
59 return plugin, cat
62def createDipole(w, h, xc, yc, scaling=100.0, fracOffset=1.2):
63 # Make random noise image: set image plane to normal distribution
64 image = afwImage.MaskedImageF(w, h)
65 image.set(0)
66 array = image.image.array
67 array[:, :] = np.random.randn(w, h)
68 # Set variance to 1.0
69 var = image.getVariance()
70 var.set(1.0)
72 if display:
73 afwDisplay.Display(frame=1).mtv(image, title="Original image")
74 afwDisplay.Display(frame=2).mtv(image.getVariance(), title="Original variance")
76 # Create Psf for dipole creation and measurement
77 psfSize = 17
78 psf = measAlg.DoubleGaussianPsf(psfSize, psfSize, 2.0, 3.5, 0.1)
79 pos = psf.getAveragePosition()
80 psfFwhmPix = sigma2fwhm*psf.computeShape(pos).getDeterminantRadius()
81 psfim = psf.computeImage(pos).convertF()
82 psfim *= scaling/psf.computePeak(pos)
83 psfw, psfh = psfim.getDimensions()
84 psfSum = np.sum(psfim.array)
86 # Create the dipole, offset by fracOffset of the Psf FWHM (pixels)
87 offset = fracOffset*psfFwhmPix//2
88 array = image.image.array
89 xp = int(xc - psfw//2 + offset)
90 yp = int(yc - psfh//2 + offset)
91 array[yp:yp + psfh, xp:xp + psfw] += psfim.array
93 xn = int(xc - psfw//2 - offset)
94 yn = int(yc - psfh//2 - offset)
95 array[yn:yn + psfh, xn:xn + psfw] -= psfim.array
97 if display:
98 afwDisplay.Display(frame=3).mtv(image, title="With dipole")
100 # Create an exposure, detect positive and negative peaks separately
101 exp = afwImage.makeExposure(image)
102 exp.setPsf(psf)
103 config = measAlg.SourceDetectionConfig()
104 config.thresholdPolarity = "both"
105 config.reEstimateBackground = False
106 schema = afwTable.SourceTable.makeMinimalSchema()
107 task = measAlg.SourceDetectionTask(schema, config=config)
108 table = afwTable.SourceTable.make(schema)
109 results = task.run(table, exp)
110 if display:
111 afwDisplay.Display(frame=4).mtv(image, title="Detection plane")
113 # Merge them together
114 assert len(results.sources) == 2
115 fpSet = results.positive
116 fpSet.merge(results.negative, 0, 0, False)
117 sources = afwTable.SourceCatalog(table)
118 fpSet.makeSources(sources)
119 assert len(sources) == 1
120 s = sources[0]
121 assert len(s.getFootprint().getPeaks()) == 2
123 return psf, psfSum, exp, s
126class DipoleAlgorithmTest(lsst.utils.tests.TestCase):
127 """ A test case for dipole algorithms"""
129 def setUp(self):
130 np.random.seed(666)
131 self.w, self.h = 100, 100 # size of image
132 self.xc, self.yc = 50, 50 # location of center of dipole
134 def testPsfDipoleFluxControl(self):
135 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc)
136 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc)
137 control = ipDiffim.PsfDipoleFluxControl()
138 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc)
139 plugin, cat = makePluginAndCat(ipDiffim.PsfDipoleFlux, "test", control, centroid="centroid")
140 source = cat.addNew()
141 source.set("centroid_x", 50)
142 source.set("centroid_y", 50)
143 source.setFootprint(s.getFootprint())
144 plugin.measure(source, exposure)
145 for key in ("_pos_instFlux", "_pos_instFluxErr", "_pos_flag",
146 "_neg_instFlux", "_neg_instFluxErr", "_neg_flag"):
147 try:
148 source.get("test" + key)
149 except Exception:
150 self.fail()
152 def testAll(self):
153 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc)
154 self.measureDipole(s, exposure)
156 def _makeModel(self, exposure, psf, fp, negCenter, posCenter):
158 negPsf = psf.computeImage(negCenter).convertF()
159 posPsf = psf.computeImage(posCenter).convertF()
160 negPeak = psf.computePeak(negCenter)
161 posPeak = psf.computePeak(posCenter)
162 negPsf /= negPeak
163 posPsf /= posPeak
165 model = afwImage.ImageF(fp.getBBox())
166 negModel = afwImage.ImageF(fp.getBBox())
167 posModel = afwImage.ImageF(fp.getBBox())
169 # The center of the Psf should be at negCenter, posCenter
170 negPsfBBox = negPsf.getBBox()
171 posPsfBBox = posPsf.getBBox()
172 modelBBox = model.getBBox()
174 # Portion of the negative Psf that overlaps the montage
175 negOverlapBBox = geom.Box2I(negPsfBBox)
176 negOverlapBBox.clip(modelBBox)
177 self.assertFalse(negOverlapBBox.isEmpty())
179 # Portion of the positivePsf that overlaps the montage
180 posOverlapBBox = geom.Box2I(posPsfBBox)
181 posOverlapBBox.clip(modelBBox)
182 self.assertFalse(posOverlapBBox.isEmpty())
184 negPsfSubim = type(negPsf)(negPsf, negOverlapBBox)
185 modelSubim = type(model)(model, negOverlapBBox)
186 negModelSubim = type(negModel)(negModel, negOverlapBBox)
187 modelSubim += negPsfSubim # just for debugging
188 negModelSubim += negPsfSubim # for fitting
190 posPsfSubim = type(posPsf)(posPsf, posOverlapBBox)
191 modelSubim = type(model)(model, posOverlapBBox)
192 posModelSubim = type(posModel)(posModel, posOverlapBBox)
193 modelSubim += posPsfSubim
194 posModelSubim += posPsfSubim
196 data = afwImage.ImageF(exposure.image, fp.getBBox())
197 var = afwImage.ImageF(exposure.variance, fp.getBBox())
198 matrixNorm = 1./np.sqrt(np.median(var.array))
200 if display:
201 afwDisplay.Display(frame=5).mtv(model, title="Unfitted model")
202 afwDisplay.Display(frame=6).mtv(data, title="Data")
204 posPsfSum = np.sum(posPsf.array)
205 negPsfSum = np.sum(negPsf.array)
207 M = np.array((np.ravel(negModel.array), np.ravel(posModel.array))).T.astype(np.float64)
208 B = np.array((np.ravel(data.array))).astype(np.float64)
209 M *= matrixNorm
210 B *= matrixNorm
212 # Numpy solution
213 fneg0, fpos0 = np.linalg.lstsq(M, B, rcond=-1)[0]
215 # Afw solution
216 lsq = afwMath.LeastSquares.fromDesignMatrix(M, B, afwMath.LeastSquares.DIRECT_SVD)
217 fneg, fpos = lsq.getSolution()
219 # Should be exaxtly the same as each other
220 self.assertAlmostEqual(1e-2*fneg0, 1e-2*fneg)
221 self.assertAlmostEqual(1e-2*fpos0, 1e-2*fpos)
223 # Recreate model
224 fitted = afwImage.ImageF(fp.getBBox())
225 negFit = type(negPsf)(negPsf, negOverlapBBox, afwImage.PARENT, True)
226 negFit *= float(fneg)
227 posFit = type(posPsf)(posPsf, posOverlapBBox, afwImage.PARENT, True)
228 posFit *= float(fpos)
230 fitSubim = type(fitted)(fitted, negOverlapBBox)
231 fitSubim += negFit
232 fitSubim = type(fitted)(fitted, posOverlapBBox)
233 fitSubim += posFit
234 if display:
235 afwDisplay.Display(frame=7).mtv(fitted, title="Fitted model")
237 fitted -= data
239 if display:
240 afwDisplay.Display(frame=8).mtv(fitted, title="Residuals")
242 fitted *= fitted
243 fitted /= var
245 if display:
246 afwDisplay.Display(frame=9).mtv(fitted, title="Chi2")
248 return fneg, negPsfSum, fpos, posPsfSum, fitted
250 def testPsfDipoleFit(self, scaling=100.):
251 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc, scaling=scaling)
252 source = self.measureDipole(s, exposure)
253 # Recreate the simultaneous joint Psf fit in python
254 fp = source.getFootprint()
255 peaks = fp.getPeaks()
256 speaks = [(p.getPeakValue(), p) for p in peaks]
257 speaks.sort()
258 dpeaks = [speaks[0][1], speaks[-1][1]]
260 negCenter = geom.Point2D(dpeaks[0].getFx(), dpeaks[0].getFy())
261 posCenter = geom.Point2D(dpeaks[1].getFx(), dpeaks[1].getFy())
263 fneg, negPsfSum, fpos, posPsfSum, residIm = self._makeModel(exposure, psf, fp, negCenter, posCenter)
265 # Should be close to the same as the inputs; as fracOffset
266 # gets smaller this will be worse. This works for scaling =
267 # 100.
268 self.assertAlmostEqual(1e-2*scaling, -1e-2*fneg, 2)
269 self.assertAlmostEqual(1e-2*scaling, 1e-2*fpos, 2)
271 # Now compare the LeastSquares results fitted here to the C++
272 # implementation: Since total flux is returned, and this is of
273 # order 1e4 for this default test, scale back down so that
274 # assertAlmostEqual behaves reasonably (the comparison to 2
275 # places means to 0.01). Also note that PsfDipoleFlux returns
276 # the total flux, while here we are just fitting for the
277 # scaling of the Psf. Therefore the comparison is
278 # fneg*negPsfSum to flux.dipole.psf.neg.
279 self.assertAlmostEqual(1e-4*fneg*negPsfSum,
280 1e-4*source.get("ip_diffim_PsfDipoleFlux_neg_instFlux"),
281 2)
282 self.assertAlmostEqual(1e-4*fpos*posPsfSum,
283 1e-4*source.get("ip_diffim_PsfDipoleFlux_pos_instFlux"),
284 2)
286 self.assertGreater(source.get("ip_diffim_PsfDipoleFlux_pos_instFluxErr"), 0.0)
287 self.assertGreater(source.get("ip_diffim_PsfDipoleFlux_neg_instFluxErr"), 0.0)
288 self.assertFalse(source.get("ip_diffim_PsfDipoleFlux_neg_flag"))
289 self.assertFalse(source.get("ip_diffim_PsfDipoleFlux_pos_flag"))
291 self.assertAlmostEqual(source.get("ip_diffim_PsfDipoleFlux_x"), 50.0, 1)
292 self.assertAlmostEqual(source.get("ip_diffim_PsfDipoleFlux_y"), 50.0, 1)
293 self.assertAlmostEqual(source.get("ip_diffim_PsfDipoleFlux_neg_centroid_x"), negCenter[0], 1)
294 self.assertAlmostEqual(source.get("ip_diffim_PsfDipoleFlux_neg_centroid_y"), negCenter[1], 1)
295 self.assertAlmostEqual(source.get("ip_diffim_PsfDipoleFlux_pos_centroid_x"), posCenter[0], 1)
296 self.assertAlmostEqual(source.get("ip_diffim_PsfDipoleFlux_pos_centroid_y"), posCenter[1], 1)
297 self.assertFalse(source.get("ip_diffim_PsfDipoleFlux_neg_flag"))
298 self.assertFalse(source.get("ip_diffim_PsfDipoleFlux_pos_flag"))
300 self.assertGreater(source.get("ip_diffim_PsfDipoleFlux_chi2dof"), 0.0)
302 def measureDipole(self, s, exp):
303 msConfig = ipDiffim.DipoleMeasurementConfig()
304 schema = afwTable.SourceTable.makeMinimalSchema()
305 schema.addField("centroid_x", type=float)
306 schema.addField("centroid_y", type=float)
307 schema.addField("centroid_flag", type='Flag')
308 task = ipDiffim.DipoleMeasurementTask(schema, config=msConfig)
309 measCat = afwTable.SourceCatalog(schema)
310 measCat.defineCentroid("centroid")
311 source = measCat.addNew()
312 source.set("centroid_x", self.xc)
313 source.set("centroid_y", self.yc)
314 source.setFootprint(s.getFootprint())
315 # Then run the default SFM task. Results not checked
316 task.run(measCat, exp)
317 return measCat[0]
319 def testDipoleAnalysis(self):
320 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc)
321 source = self.measureDipole(s, exposure)
322 dpAnalysis = ipDiffim.DipoleAnalysis()
323 dpAnalysis(source)
325 def testDipoleDeblender(self):
326 psf, psfSum, exposure, s = createDipole(self.w, self.h, self.xc, self.yc)
327 source = self.measureDipole(s, exposure)
328 dpDeblender = ipDiffim.DipoleDeblender()
329 dpDeblender(source, exposure)
332class DipoleMeasurementTaskTest(lsst.utils.tests.TestCase):
333 """A test case for the DipoleMeasurementTask. Essentially just
334 test the classification flag since the invididual algorithms are
335 tested above"""
337 def setUp(self):
338 np.random.seed(666)
339 self.config = ipDiffim.DipoleMeasurementConfig()
341 def tearDown(self):
342 del self.config
344 def testMeasure(self):
345 schema = afwTable.SourceTable.makeMinimalSchema()
346 task = ipDiffim.DipoleMeasurementTask(schema, config=self.config)
347 table = afwTable.SourceTable.make(schema)
348 sources = afwTable.SourceCatalog(table)
349 source = sources.addNew()
350 # make fake image
351 psf, psfSum, exposure, s = createDipole(100, 100, 50, 50)
353 # set it in source with the appropriate schema
354 source.setFootprint(s.getFootprint())
355 task.run(sources, exposure)
356 self.assertEqual(source.get("ip_diffim_ClassificationDipole_value"), 1.0)
359class TestMemory(lsst.utils.tests.MemoryTestCase):
360 pass
363def setup_module(module):
364 lsst.utils.tests.init()
367if __name__ == "__main__": 367 ↛ 368line 367 didn't jump to line 368 because the condition on line 367 was never true
368 lsst.utils.tests.init()
369 unittest.main()