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# 

# LSST Data Management System 

# Copyright 2012 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

import unittest 

 

import numpy as np 

 

import lsst.utils.tests 

import lsst.afw.math as afwMath 

import lsst.afw.image as afwImage 

import lsst.afw.display.ds9 as ds9 

import lsst.afw.image.utils as afwImageUtils 

from lsst.ip.isr.fringe import FringeTask 

 

try: 

debug 

except NameError: 

debug = False 

 

 

def checkDebug(): 

"""Turn on Task debugging if desired""" 

if debug: 

import lsstDebug 

print("Importing debug settings...") 

 

def DebugInfo(name): 

di = lsstDebug.getInfo(name) # N.b. lsstDebug.Info(name) would call us recursively 

if name == "lsst.ip.isr.fringe": 

di.plot = True 

return di 

lsstDebug.Info = DebugInfo 

 

 

class FringeDataRef(object): 

"""Quacks like a ButlerDataRef, so we can provide an in-memory fringe frame""" 

 

def __init__(self, fringe): 

self.fringe = fringe 

self.dataId = {'test': True} 

 

def get(self, name="fringe", immediate=False): 

if name == "fringe": 

return self.fringe 

if name == "ccdExposureId": 

return 1000 

 

 

def createFringe(width, height, xFreq, xOffset, yFreq, yOffset): 

"""Create a fringe frame 

 

@param width, height Size of image 

@param xFreq, yFreq Frequency of sinusoids in x and y 

@param xOffset, yOffset Phase of sinusoids in x and y 

@return Fringe frame 

""" 

image = afwImage.ImageF(width, height) 

array = image.getArray() 

x, y = np.indices(array.shape) 

array[x, y] = np.sin(xFreq*x + xOffset) + np.sin(yFreq*y + yOffset) 

mi = afwImage.makeMaskedImage(image) 

exp = afwImage.makeExposure(mi) 

exp.setFilter(afwImage.Filter('FILTER')) 

return exp 

 

 

frame = 1 # ds9 frame 

 

 

class FringeTestCase(lsst.utils.tests.TestCase): 

"""Tests of the FringeTask""" 

 

def setUp(self): 

self.size = 512 

self.config = FringeTask.ConfigClass() 

self.config.filters = ['FILTER'] 

self.config.num = 5000 

self.config.small = 1 

self.config.large = 128 

self.config.pedestal = False 

afwImageUtils.defineFilter('FILTER', lambdaEff=0) 

 

def tearDown(self): 

afwImageUtils.resetFilters() 

 

def checkFringe(self, task, exp, fringes, stddevMax): 

"""Run fringe subtraction and verify 

 

@param task Task to run 

@param exp Science exposure 

@param dataRef Data reference that will provide the fringes 

@param stddevMax Maximum allowable standard deviation 

""" 

if debug: 

global frame 

ds9.mtv(exp, frame=frame, title="Science exposure") 

frame += 1 

if not isinstance(fringes, list): 

fringe = [fringes] 

for i, f in enumerate(fringe): 

ds9.mtv(f, frame=frame, title="Fringe frame %d" % (i+1)) 

frame += 1 

 

task.run(exp, fringes) 

 

mi = exp.getMaskedImage() 

 

if debug: 

ds9.mtv(exp, frame=frame, title="Subtracted") 

frame += 1 

 

mi -= afwMath.makeStatistics(mi, afwMath.MEAN).getValue() 

self.assertLess(afwMath.makeStatistics(mi, afwMath.STDEV).getValue(), stddevMax) 

 

def testSingle(self, pedestal=0.0, stddevMax=1.0e-4): 

"""Test subtraction of a single fringe frame 

 

@param pedestal Pedestal to add into fringe frame 

@param stddevMax Maximum allowable standard deviation 

""" 

xFreq = np.pi / 10.0 

xOffset = 1.0 

yFreq = np.pi / 15.0 

yOffset = 0.5 

scale = 1.0 

fringe = createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

fMi = fringe.getMaskedImage() 

fMi += pedestal 

exp = createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

eMi = exp.getMaskedImage() 

eMi *= scale 

 

task = FringeTask(name="fringe", config=self.config) 

self.checkFringe(task, exp, fringe, stddevMax) 

 

def testBad(self, bad="BAD"): 

"""Test fringe subtraction with bad inputs 

 

@param bad Mask plane to use 

""" 

xFreq = np.pi / 10.0 

xOffset = 1.0 

yFreq = np.pi / 15.0 

yOffset = 0.5 

fringe = createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

exp = createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

 

# This is a bad CCD: entirely masked 

exp.maskedImage.image.set(0.0) 

mask = exp.maskedImage.mask 

mask.set(mask.getPlaneBitMask(bad)) 

 

self.config.stats.badMaskPlanes = [bad] 

task = FringeTask(name="fringe", config=self.config) 

task.run(exp, fringe) 

self.assertFloatsEqual(exp.maskedImage.image.array, 0.0) 

 

def testPedestal(self): 

"""Test subtraction of a fringe frame with a pedestal""" 

self.config.pedestal = True 

self.testSingle(pedestal=10000.0, stddevMax=1.0e-3) # Not sure why this produces worse sttdev 

self.testMultiple(pedestal=10000.0) 

 

def testMultiple(self, pedestal=0.0): 

"""Test subtraction of multiple fringe frames 

 

@param pedestal Pedestal to add into fringe frame 

""" 

xFreqList = [0.1, 0.13, 0.06] 

xOffsetList = [0.0, 0.1, 0.2] 

yFreqList = [0.09, 0.12, 0.07] 

yOffsetList = [0.3, 0.2, 0.1] 

fringeList = [createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

for xFreq, xOffset, yFreq, yOffset in 

zip(xFreqList, xOffsetList, yFreqList, yOffsetList)] 

 

for fringe in fringeList: 

fMi = fringe.getMaskedImage() 

fMi += pedestal 

# Generate science frame 

scales = [0.33, 0.33, 0.33] 

image = afwImage.ImageF(self.size, self.size) 

image.set(0) 

for s, f in zip(scales, fringeList): 

image.scaledPlus(s, f.getMaskedImage().getImage()) 

mi = afwImage.makeMaskedImage(image) 

exp = afwImage.makeExposure(mi) 

exp.setFilter(afwImage.Filter('FILTER')) 

 

task = FringeTask(name="multiFringe", config=self.config) 

self.checkFringe(task, exp, fringeList, stddevMax=1.0e-2) 

 

def testRunDataRef(self, pedestal=0.0, stddevMax=1.0e-4): 

"""Test the .runDataRef method for complete test converage 

 

@param pedestal Pedestal to add into fringe frame 

@param stddevMax Maximum allowable standard deviation 

""" 

xFreq = np.pi / 10.0 

xOffset = 1.0 

yFreq = np.pi / 15.0 

yOffset = 0.5 

scale = 1.0 

fringe = createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

fMi = fringe.getMaskedImage() 

fMi += pedestal 

exp = createFringe(self.size, self.size, xFreq, xOffset, yFreq, yOffset) 

eMi = exp.getMaskedImage() 

eMi *= scale 

 

task = FringeTask(name="fringe", config=self.config) 

dataRef = FringeDataRef(fringe) 

task.runDataRef(exp, dataRef) 

 

mi = exp.getMaskedImage() 

mi -= afwMath.makeStatistics(mi, afwMath.MEAN).getValue() 

self.assertLess(afwMath.makeStatistics(mi, afwMath.STDEV).getValue(), stddevMax) 

 

 

class MemoryTester(lsst.utils.tests.MemoryTestCase): 

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

246 ↛ 247line 246 didn't jump to line 247, because the condition on line 246 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()