Coverage for tests/test_stacker.py: 10%

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1# This file is part of afw. 

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/>. 

21 

22""" 

23Tests for Stack 

24 

25Run with: 

26 python test_stacker.py 

27or 

28 pytest test_stacker.py 

29""" 

30import unittest 

31from functools import reduce 

32 

33import numpy as np 

34 

35import lsst.geom 

36import lsst.afw.image as afwImage 

37import lsst.afw.math as afwMath 

38import lsst.utils.tests 

39import lsst.pex.exceptions as pexEx 

40import lsst.afw.display as afwDisplay 

41 

42display = False 

43afwDisplay.setDefaultMaskTransparency(75) 

44 

45###################################### 

46# main body of code 

47###################################### 

48 

49 

50class StackTestCase(lsst.utils.tests.TestCase): 

51 

52 def setUp(self): 

53 np.random.seed(1) 

54 self.nImg = 10 

55 self.nX, self.nY = 64, 64 

56 self.values = [1.0, 2.0, 2.0, 3.0, 8.0] 

57 

58 def testMean(self): 

59 """ Test the statisticsStack() function for a MEAN""" 

60 

61 knownMean = 0.0 

62 imgList = [] 

63 for iImg in range(self.nImg): 

64 imgList.append(afwImage.ImageF( 

65 lsst.geom.Extent2I(self.nX, self.nY), iImg)) 

66 knownMean += iImg 

67 

68 imgStack = afwMath.statisticsStack(imgList, afwMath.MEAN) 

69 knownMean /= self.nImg 

70 self.assertEqual(imgStack[self.nX//2, self.nY//2, afwImage.LOCAL], knownMean) 

71 

72 # Test in-place stacking 

73 afwMath.statisticsStack(imgStack, imgList, afwMath.MEAN) 

74 self.assertEqual(imgStack[self.nX//2, self.nY//2, afwImage.LOCAL], knownMean) 

75 

76 def testStatistics(self): 

77 """ Test the statisticsStack() function """ 

78 

79 imgList = [] 

80 for val in self.values: 

81 imgList.append(afwImage.ImageF( 

82 lsst.geom.Extent2I(self.nX, self.nY), val)) 

83 

84 imgStack = afwMath.statisticsStack(imgList, afwMath.MEAN) 

85 mean = reduce(lambda x, y: x+y, self.values)/float(len(self.values)) 

86 self.assertAlmostEqual(imgStack[self.nX//2, self.nY//2, afwImage.LOCAL], mean) 

87 

88 imgStack = afwMath.statisticsStack(imgList, afwMath.MEDIAN) 

89 median = sorted(self.values)[len(self.values)//2] 

90 self.assertEqual(imgStack[self.nX//2, self.nY//2, afwImage.LOCAL], median) 

91 

92 def testWeightedStack(self): 

93 """ Test statisticsStack() function when weighting by a variance plane""" 

94 

95 sctrl = afwMath.StatisticsControl() 

96 sctrl.setWeighted(True) 

97 mimgList = [] 

98 for val in self.values: 

99 mimg = afwImage.MaskedImageF(lsst.geom.Extent2I(self.nX, self.nY)) 

100 mimg.set(val, 0x0, val) 

101 mimgList.append(mimg) 

102 mimgStack = afwMath.statisticsStack(mimgList, afwMath.MEAN, sctrl) 

103 

104 wvalues = [1.0/q for q in self.values] 

105 wmean = float(len(self.values)) / reduce(lambda x, y: x + y, wvalues) 

106 self.assertAlmostEqual( 

107 mimgStack.image[self.nX//2, self.nY//2, afwImage.LOCAL], 

108 wmean) 

109 

110 # Test in-place stacking 

111 afwMath.statisticsStack(mimgStack, mimgList, afwMath.MEAN, sctrl) 

112 self.assertAlmostEqual( 

113 mimgStack.image[self.nX//2, self.nY//2, afwImage.LOCAL], 

114 wmean) 

115 

116 def testConstantWeightedStack(self): 

117 """ Test statisticsStack() function when weighting by a vector of weights""" 

118 

119 sctrl = afwMath.StatisticsControl() 

120 imgList = [] 

121 weights = [] 

122 for val in self.values: 

123 img = afwImage.ImageF(lsst.geom.Extent2I(self.nX, self.nY), val) 

124 imgList.append(img) 

125 weights.append(val) 

126 imgStack = afwMath.statisticsStack( 

127 imgList, afwMath.MEAN, sctrl, weights) 

128 

129 wsum = reduce(lambda x, y: x + y, self.values) 

130 wvalues = [x*x for x in self.values] 

131 wmean = reduce(lambda x, y: x + y, wvalues)/float(wsum) 

132 self.assertAlmostEqual(imgStack[self.nX//2, self.nY//2, afwImage.LOCAL], wmean) 

133 

134 def testRequestMoreThanOneStat(self): 

135 """ Make sure we throw an exception if someone requests more than one type of statistics. """ 

136 

137 sctrl = afwMath.StatisticsControl() 

138 imgList = [] 

139 for val in self.values: 

140 img = afwImage.ImageF(lsst.geom.Extent2I(self.nX, self.nY), val) 

141 imgList.append(img) 

142 

143 def tst(): 

144 afwMath.statisticsStack( 

145 imgList, 

146 afwMath.Property(afwMath.MEAN | afwMath.MEANCLIP), 

147 sctrl) 

148 

149 self.assertRaises(pexEx.InvalidParameterError, tst) 

150 

151 def testReturnInputs(self): 

152 """ Make sure that a single file put into the stacker is returned unscathed""" 

153 

154 imgList = [] 

155 

156 img = afwImage.MaskedImageF(lsst.geom.Extent2I(10, 20)) 

157 for y in range(img.getHeight()): 

158 simg = img.Factory( 

159 img, 

160 lsst.geom.Box2I(lsst.geom.Point2I(0, y), 

161 lsst.geom.Extent2I(img.getWidth(), 1)), 

162 afwImage.LOCAL) 

163 simg.set(y) 

164 

165 imgList.append(img) 

166 

167 imgStack = afwMath.statisticsStack(imgList, afwMath.MEAN) 

168 

169 if display: 

170 afwDisplay.Display(frame=1).mtv(img, title="input") 

171 afwDisplay.Display(frame=2).mtv(imgStack, title="stack") 

172 

173 self.assertEqual(img[0, 0, afwImage.LOCAL][0], imgStack[0, 0, afwImage.LOCAL][0]) 

174 

175 def testStackBadPixels(self): 

176 """Check that we properly ignore masked pixels, and set noGoodPixelsMask where there are 

177 no good pixels""" 

178 mimgVec = [] 

179 

180 DETECTED = afwImage.Mask.getPlaneBitMask("DETECTED") 

181 EDGE = afwImage.Mask.getPlaneBitMask("EDGE") 

182 INTRP = afwImage.Mask.getPlaneBitMask("INTRP") 

183 SAT = afwImage.Mask.getPlaneBitMask("SAT") 

184 

185 sctrl = afwMath.StatisticsControl() 

186 sctrl.setNanSafe(False) 

187 sctrl.setAndMask(INTRP | SAT) 

188 sctrl.setNoGoodPixelsMask(EDGE) 

189 

190 # set these pixels to EDGE 

191 edgeBBox = lsst.geom.Box2I(lsst.geom.Point2I(0, 0), 

192 lsst.geom.Extent2I(20, 20)) 

193 width, height = 512, 512 

194 dim = lsst.geom.Extent2I(width, height) 

195 val, maskVal = 10, DETECTED 

196 for i in range(4): 

197 mimg = afwImage.MaskedImageF(dim) 

198 mimg.set(val, maskVal, 1) 

199 # 

200 # Set part of the image to NaN (with the INTRP bit set) 

201 # 

202 llc = lsst.geom.Point2I(width//2*(i//2), height//2*(i % 2)) 

203 bbox = lsst.geom.Box2I(llc, dim//2) 

204 

205 smimg = mimg.Factory(mimg, bbox, afwImage.LOCAL) 

206 del smimg 

207 # 

208 # And the bottom corner to SAT 

209 # 

210 smask = mimg.getMask().Factory(mimg.getMask(), edgeBBox, afwImage.LOCAL) 

211 smask |= SAT 

212 del smask 

213 

214 mimgVec.append(mimg) 

215 

216 if display > 1: 

217 afwDisplay.Display(frame=i).mtv(mimg, title=str(i)) 

218 

219 mimgStack = afwMath.statisticsStack(mimgVec, afwMath.MEAN, sctrl) 

220 

221 if display: 

222 i += 1 

223 afwDisplay.Display(frame=i).mtv(mimgStack, title="Stack") 

224 i += 1 

225 afwDisplay.Display(frame=i).mtv(mimgStack.getVariance(), title="var(Stack)") 

226 # 

227 # Check the output, ignoring EDGE pixels 

228 # 

229 sctrl = afwMath.StatisticsControl() 

230 sctrl.setAndMask(afwImage.Mask.getPlaneBitMask("EDGE")) 

231 

232 stats = afwMath.makeStatistics( 

233 mimgStack, afwMath.MIN | afwMath.MAX, sctrl) 

234 self.assertEqual(stats.getValue(afwMath.MIN), val) 

235 self.assertEqual(stats.getValue(afwMath.MAX), val) 

236 # 

237 # We have to clear EDGE in the known bad corner to check the mask 

238 # 

239 smask = mimgStack.mask[edgeBBox, afwImage.LOCAL] 

240 self.assertEqual(smask[edgeBBox.getMin(), afwImage.LOCAL], EDGE) 

241 smask &= ~EDGE 

242 del smask 

243 

244 self.assertEqual( 

245 afwMath.makeStatistics(mimgStack.getMask(), 

246 afwMath.SUM, sctrl).getValue(), 

247 maskVal) 

248 

249 def testTicket1412(self): 

250 """Ticket 1412: ignored mask bits are propegated to output stack.""" 

251 

252 mimg1 = afwImage.MaskedImageF(lsst.geom.Extent2I(1, 1)) 

253 mimg1[0, 0, afwImage.LOCAL] = (1, 0x4, 1) # set 0100 

254 mimg2 = afwImage.MaskedImageF(lsst.geom.Extent2I(1, 1)) 

255 mimg2[0, 0, afwImage.LOCAL] = (2, 0x3, 1) # set 0010 and 0001 

256 

257 imgList = [] 

258 imgList.append(mimg1) 

259 imgList.append(mimg2) 

260 

261 sctrl = afwMath.StatisticsControl() 

262 sctrl.setAndMask(0x1) # andmask only 0001 

263 

264 # try first with no sctrl (no andmask set), should see 0x0111 for all 

265 # output mask pixels 

266 imgStack = afwMath.statisticsStack(imgList, afwMath.MEAN) 

267 self.assertEqual(imgStack[0, 0, afwImage.LOCAL][1], 0x7) 

268 

269 # now try with sctrl (andmask = 0x0001), should see 0x0100 for all 

270 # output mask pixels 

271 imgStack = afwMath.statisticsStack(imgList, afwMath.MEAN, sctrl) 

272 self.assertEqual(imgStack[0, 0, afwImage.LOCAL][1], 0x4) 

273 

274 def test2145(self): 

275 """The how-to-repeat from #2145""" 

276 size = 5 

277 statsCtrl = afwMath.StatisticsControl() 

278 statsCtrl.setCalcErrorFromInputVariance(True) 

279 maskedImageList = [] 

280 weightList = [] 

281 for i in range(3): 

282 mi = afwImage.MaskedImageF(size, size) 

283 mi.image.array[:] = np.random.normal(10, 0.1, (size, size)) 

284 mi.variance.array[:] = np.random.normal(10, 0.1, (size, size)) 

285 maskedImageList.append(mi) 

286 weightList.append(1.0) 

287 

288 stack = afwMath.statisticsStack( 

289 maskedImageList, afwMath.MEAN, statsCtrl, weightList) 

290 self.assertNotEqual(np.sum(stack.getVariance().getArray()), 0.0) 

291 

292 def testMosaicMode(self): 

293 """Test that mosaic mode constructs a variance plane of mean of inputs 

294 """ 

295 SIZE = 5 

296 MEAN = 10 

297 VAR = 0.1 

298 

299 maskedImageList = [] 

300 weightList = [] 

301 for i in range(3): 

302 mi = afwImage.MaskedImageF(SIZE, SIZE) 

303 mi.image.array[:] = np.random.normal(MEAN*i, VAR, (SIZE, SIZE)) 

304 mi.variance.array[:] = np.random.normal(MEAN*i, VAR, (SIZE, SIZE)) 

305 maskedImageList.append(mi) 

306 # weight each image differently 

307 weightList.append(float(i)) 

308 

309 statsCtrl = afwMath.StatisticsControl() 

310 statsCtrl.setCalcErrorMosaicMode(True) 

311 

312 # test unweighted mean 

313 stack = afwMath.statisticsStack(maskedImageList, afwMath.MEAN, statsCtrl, weightList) 

314 self.assertAlmostEqual(np.mean(stack.variance.array), np.mean(stack.image.array), delta=0.1) 

315 

316 # test weighted mean 

317 statsCtrl.setWeighted(True) 

318 stack = afwMath.statisticsStack(maskedImageList, afwMath.MEAN, statsCtrl, weightList) 

319 self.assertAlmostEqual(np.mean(stack.variance.array), np.mean(stack.image.array), delta=0.1) 

320 

321 def testRejectedMaskPropagation(self): 

322 """Test that we can propagate mask bits from rejected pixels, when the amount 

323 of rejection crosses a threshold.""" 

324 rejectedBit = 1 # use this bit to determine whether to reject a pixel 

325 propagatedBit = 2 # propagate this bit if a pixel with it set is rejected 

326 statsCtrl = afwMath.StatisticsControl() 

327 statsCtrl.setMaskPropagationThreshold(propagatedBit, 0.3) 

328 statsCtrl.setAndMask(1 << rejectedBit) 

329 statsCtrl.setWeighted(True) 

330 maskedImageList = [] 

331 

332 # start with 4 images with no mask bits set 

333 partialSum = np.zeros((1, 4), dtype=np.float32) 

334 finalImage = np.array([12.0, 12.0, 12.0, 12.0], dtype=np.float32) 

335 for i in range(4): 

336 mi = afwImage.MaskedImageF(4, 1) 

337 imArr, maskArr, varArr = mi.getArrays() 

338 imArr[:, :] = np.ones((1, 4), dtype=np.float32) 

339 maskedImageList.append(mi) 

340 partialSum += imArr 

341 # add one more image with all permutations of the first two bits set in 

342 # different pixels 

343 mi = afwImage.MaskedImageF(4, 1) 

344 mi.image.array[0, :] = finalImage 

345 mi.mask.array[0, 1] |= (1 << rejectedBit) 

346 mi.mask.array[0, 2] |= (1 << propagatedBit) 

347 mi.mask.array[0, 3] |= (1 << rejectedBit) 

348 mi.mask.array[0, 3] |= (1 << propagatedBit) 

349 maskedImageList.append(mi) 

350 

351 # these will always be rejected 

352 finalImage[1] = 0.0 

353 finalImage[3] = 0.0 

354 

355 # Uniform weights: we should only see pixel 2 set with propagatedBit, because it's not rejected; 

356 # pixel 3 is rejected, but its weight (0.2) below the propagation 

357 # threshold (0.3) 

358 stack1 = afwMath.statisticsStack(maskedImageList, afwMath.MEAN, statsCtrl, [ 

359 1.0, 1.0, 1.0, 1.0, 1.0]) 

360 self.assertEqual(stack1[0, 0, afwImage.LOCAL][1], 0x0) 

361 self.assertEqual(stack1[1, 0, afwImage.LOCAL][1], 0x0) 

362 self.assertEqual(stack1[2, 0, afwImage.LOCAL][1], 1 << propagatedBit) 

363 self.assertEqual(stack1[3, 0, afwImage.LOCAL][1], 0x0) 

364 self.assertFloatsAlmostEqual(stack1.getImage().getArray(), 

365 (partialSum + finalImage) / np.array([5.0, 4.0, 5.0, 4.0]), rtol=1E-7) 

366 

367 # Give the masked image more weight: we should see pixel 2 and pixel 3 set with propagatedBit, 

368 # pixel 2 because it's not rejected, and pixel 3 because the weight of the rejection (0.3333) 

369 # is above the threshold (0.3) 

370 # Note that rejectedBit is never propagated, because we didn't include it in statsCtrl (of course, 

371 # normally the bits we'd propagate and the bits we'd reject would be 

372 # the same) 

373 stack2 = afwMath.statisticsStack(maskedImageList, afwMath.MEAN, statsCtrl, [ 

374 1.0, 1.0, 1.0, 1.0, 2.0]) 

375 self.assertEqual(stack2[0, 0, afwImage.LOCAL][1], 0x0) 

376 self.assertEqual(stack2[1, 0, afwImage.LOCAL][1], 0x0) 

377 self.assertEqual(stack2[2, 0, afwImage.LOCAL][1], 1 << propagatedBit) 

378 self.assertEqual(stack2[3, 0, afwImage.LOCAL][1], 1 << propagatedBit) 

379 self.assertFloatsAlmostEqual(stack2.getImage().getArray(), 

380 (partialSum + 2*finalImage) / np.array([6.0, 4.0, 6.0, 4.0]), rtol=1E-7) 

381 

382 def testClipped(self): 

383 """Test that we set mask bits when pixels are clipped""" 

384 box = lsst.geom.Box2I(lsst.geom.Point2I(12345, 67890), lsst.geom.Extent2I(3, 3)) 

385 num = 10 

386 maskVal = 0xAD 

387 value = 0.0 

388 

389 images = [afwImage.MaskedImageF(box) for _ in range(num)] 

390 statsCtrl = afwMath.StatisticsControl() 

391 statsCtrl.setAndMask(maskVal) 

392 clipped = 1 << afwImage.Mask().addMaskPlane("CLIPPED") 

393 

394 # No clipping: check that vanilla is working 

395 for img in images: 

396 img.getImage().set(value) 

397 img.getMask().set(0) 

398 stack = afwMath.statisticsStack(images, afwMath.MEANCLIP, clipped=clipped) 

399 self.assertFloatsAlmostEqual(stack.getImage().getArray(), 0.0, atol=0.0) 

400 self.assertFloatsAlmostEqual(stack.getMask().getArray(), 0, atol=0.0) # Not floats, but that's OK 

401 

402 # Clip a pixel; the CLIPPED bit should be set 

403 images[0].getImage()[1, 1, afwImage.LOCAL] = value + 1.0 

404 stack = afwMath.statisticsStack(images, afwMath.MEANCLIP, clipped=clipped) 

405 self.assertFloatsAlmostEqual(stack.getImage().getArray(), 0.0, atol=0.0) 

406 self.assertEqual(stack.mask[1, 1, afwImage.LOCAL], clipped) 

407 

408 # Mask a pixel; the CLIPPED bit should be set 

409 images[0].getMask()[1, 1, afwImage.LOCAL] = maskVal 

410 stack = afwMath.statisticsStack(images, afwMath.MEAN, statsCtrl, clipped=clipped) 

411 self.assertFloatsAlmostEqual(stack.getImage().getArray(), 0.0, atol=0.0) 

412 self.assertEqual(stack.mask[1, 1, afwImage.LOCAL], clipped) 

413 

414 # Excuse that mask; the CLIPPED bit should not be set 

415 stack = afwMath.statisticsStack(images, afwMath.MEAN, statsCtrl, clipped=clipped, excuse=maskVal) 

416 self.assertFloatsAlmostEqual(stack.getImage().getArray(), 0.0, atol=0.0) 

417 self.assertEqual(stack.mask[1, 1, afwImage.LOCAL], 0) 

418 

419 # Map that mask value to a different one. 

420 rejected = 1 << afwImage.Mask().addMaskPlane("REJECTED") 

421 maskMap = [(maskVal, rejected)] 

422 images[0].mask[1, 1, afwImage.LOCAL] = 0 # only want to clip, not mask, this one 

423 images[1].mask[1, 2, afwImage.LOCAL] = maskVal # only want to mask, not clip, this one 

424 stack = afwMath.statisticsStack(images, afwMath.MEANCLIP, statsCtrl, wvector=[], clipped=clipped, 

425 maskMap=maskMap) 

426 self.assertFloatsAlmostEqual(stack.getImage().getArray(), 0.0, atol=0.0) 

427 self.assertEqual(stack.mask[1, 1, afwImage.LOCAL], clipped) 

428 self.assertEqual(stack.mask[1, 2, afwImage.LOCAL], rejected) 

429 

430################################################################# 

431# Test suite boiler plate 

432################################################################# 

433 

434 

435class TestMemory(lsst.utils.tests.MemoryTestCase): 

436 pass 

437 

438 

439def setup_module(module): 

440 lsst.utils.tests.init() 

441 

442 

443if __name__ == "__main__": 443 ↛ 444line 443 didn't jump to line 444, because the condition on line 443 was never true

444 lsst.utils.tests.init() 

445 unittest.main()