Coverage for tests/test_empiricalVariance.py : 17%

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1#
2# LSST Data Management System
3# Copyright 2018 LSST Corporation.
4#
5# This product includes software developed by the
6# LSST Project (http://www.lsst.org/).
7#
8# This program is free software: you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation, either version 3 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the LSST License Statement and
19# the GNU General Public License along with this program. If not,
20# see <http://www.lsstcorp.org/LegalNotices/>.
21#
22import numpy as np
23import unittest
25import lsst.utils.tests
27from lsst.daf.base import PropertyList
28import lsst.afw.cameraGeom as cameraGeom
29from lsst.geom import Point2I, Extent2I, Box2I, Extent2D
30from lsst.afw.image import ExposureF, VisitInfo
32from lsst.ip.isr.isrTask import IsrTask
35def makeAmplifier(name, bbox, rawImageBox, overscanBox, gain, readNoise, saturation):
36 amp = cameraGeom.Amplifier.Builder()
37 amp.setName(name)
38 amp.setBBox(bbox)
39 amp.setRawDataBBox(rawImageBox)
40 amp.setRawHorizontalOverscanBBox(overscanBox)
41 amp.setGain(gain)
42 amp.setReadNoise(readNoise)
43 amp.setSaturation(saturation)
44 amp.setSuspectLevel(np.nan)
45 return amp
48class EmpiricalVarianceTestCast(lsst.utils.tests.TestCase):
49 def setUp(self):
50 """Constructs a CCD with two amplifiers and prepares for ISR"""
51 np.random.seed(12345)
52 baseValue = 100.0
53 gain = 1.0
54 readNoise = 123456789.0
55 saturation = 987654321.0
56 height = 234
57 imageSize = Extent2I(123, height)
58 overscanSize = Extent2I(16, height)
59 self.sigma = 1.234
61 # Set up the various regions
62 overscan1 = Box2I(Point2I(0, 0), overscanSize)
63 image1 = Box2I(Point2I(overscanSize[0], 0), imageSize)
64 image2 = Box2I(Point2I(overscanSize[0] + imageSize[0], 0), imageSize)
65 overscan2 = Box2I(Point2I(overscanSize[0] + 2*imageSize[0], 0), overscanSize)
67 leftBox = Box2I(overscan1.getMin(), Extent2I(overscan1.getWidth() + image1.getWidth(), height))
68 rightBox = Box2I(image2.getMin(), Extent2I(image2.getWidth() + overscan2.getWidth(), height))
70 target1 = Box2I(Point2I(0, 0), imageSize)
71 target2 = Box2I(Point2I(image1.getWidth(), 0), imageSize)
73 # Set the pixels
74 exposure = ExposureF(Box2I(Point2I(0, 0), Extent2I(imageSize[0]*2 + overscanSize[0]*2, height)))
75 yy = np.arange(0, height, 1, dtype=np.float32)
76 leftImage = ExposureF(exposure, leftBox)
77 leftImage.image.array[:] = baseValue + yy[:, np.newaxis]
78 rightImage = ExposureF(exposure, rightBox)
79 rightImage.image.array[:] = baseValue - yy[:, np.newaxis]
81 leftOverscan = ExposureF(exposure, overscan1)
82 leftOverscan.image.array += np.random.normal(0.0, self.sigma, leftOverscan.image.array.shape)
83 rightOverscan = ExposureF(exposure, overscan2)
84 rightOverscan.image.array += np.random.normal(0.0, self.sigma, leftOverscan.image.array.shape)
85 exposure.mask.array[:] = 0.0
86 exposure.variance.array[:] = np.nan
88 # Construct the detectors
89 amp1 = makeAmplifier("left", target1, image1, overscan1, gain, readNoise, saturation)
90 amp2 = makeAmplifier("right", target2, image2, overscan2, gain, readNoise, saturation)
91 ccdBox = Box2I(Point2I(0, 0), Extent2I(image1.getWidth() + image2.getWidth(), height))
92 camBuilder = cameraGeom.Camera.Builder("fakeCam")
93 detBuilder = camBuilder.add("detector", 1)
94 detBuilder.setSerial("det1")
95 detBuilder.setBBox(ccdBox)
96 detBuilder.setPixelSize(Extent2D(1.0, 1.0))
97 detBuilder.setOrientation(cameraGeom.Orientation())
98 detBuilder.append(amp1)
99 detBuilder.append(amp2)
100 cam = camBuilder.finish()
101 exposure.setDetector(cam.get('detector'))
103 header = PropertyList()
104 header.add("EXPTIME", 0.0)
105 exposure.getInfo().setVisitInfo(VisitInfo(header))
107 self.exposure = exposure
108 self.config = IsrTask.ConfigClass()
110 # Disable everything we don't care about
111 self.config.doBias = False
112 self.config.doDark = False
113 self.config.doFlat = False
114 self.config.doFringe = False
115 self.config.doDefect = False
116 self.config.doWrite = False
117 self.config.expectWcs = False
118 self.config.doLinearize = False
119 self.config.doCrosstalk = False
120 self.config.doBrighterFatter = False
121 self.config.doAttachTransmissionCurve = False
122 self.config.doAssembleCcd = False
123 self.config.doNanMasking = False
124 self.config.doInterpolate = False
126 # Set the things that match our test setup
127 self.config.overscan.fitType = "CHEB"
128 self.config.overscan.order = 1
129 self.config.doEmpiricalReadNoise = True
131 self.task = IsrTask(config=self.config)
133 def tearDown(self):
134 del self.exposure
136 def testEmpiricalVariance(self):
137 results = self.task.run(self.exposure)
138 postIsr = results.exposure
140 self.assertFloatsEqual(postIsr.mask.array, 0)
141 # Image is not exactly zero because the noise in the overscan (required to be able to set
142 # the empirical variance) leads to a slight misestimate in the polynomial fit.
143 self.assertFloatsAlmostEqual(np.median(postIsr.image.array), 0.0, atol=5.0e-2)
144 self.assertFloatsAlmostEqual(np.nanmedian(postIsr.variance.array), self.sigma**2, rtol=5.0e-2)
147class MemoryTester(lsst.utils.tests.MemoryTestCase):
148 pass
151def setup_module(module):
152 lsst.utils.tests.init()
155if __name__ == "__main__": 155 ↛ 156line 155 didn't jump to line 156, because the condition on line 155 was never true
156 import sys
157 setup_module(sys.modules[__name__])
158 unittest.main()