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# 

# LSST Data Management System 

# Copyright 2016 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 lsst.utils.tests 

from lsst.daf.base import PropertyList 

from lsst.obs.base import exposureFromImage 

import lsst.afw.image as afwImage 

 

 

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

"""A test case for exposureFromImage.""" 

 

def setUp(self): 

self.maskedImage = makeRampMaskedImage(10, 11) 

 

def tearDown(self): 

del self.maskedImage 

 

def testDecoratedImage(self): 

image = self.maskedImage.getImage() 

decoImage = afwImage.DecoratedImageF(image) 

metadata = PropertyList() 

metadata.set("FOO", "BAR") 

decoImage.setMetadata(metadata) 

exposure = exposureFromImage(decoImage) 

self.assertImagesEqual(exposure.getMaskedImage().getImage(), image) 

md = exposure.getMetadata() 

self.assertEqual(md.getScalar("FOO"), "BAR") 

 

def testExposure(self): 

inExposure = afwImage.ExposureF(self.maskedImage) 

outExposure = exposureFromImage(inExposure) 

self.assertIs(inExposure, outExposure) 

 

def testImage(self): 

image = self.maskedImage.getImage() 

exposure = exposureFromImage(image) 

self.assertImagesEqual(image, exposure.getMaskedImage().getImage()) 

 

def testMaskedImage(self): 

exposure = exposureFromImage(self.maskedImage) 

self.assertMaskedImagesEqual(self.maskedImage, exposure.getMaskedImage()) 

 

def testDecoratedImageBadWcs(self): 

"""Test that exposureFromImage() attaches a None wcs to the exposure 

when the WCS cannot be constructed 

""" 

image = self.maskedImage.getImage() 

decoImage = afwImage.DecoratedImageF(image) 

metadata = PropertyList() 

metadata.set("CTYPE1", "RA---TPV") 

metadata.set("CTYPE2", "DEC--TPV") 

decoImage.setMetadata(metadata) 

exposure = exposureFromImage(decoImage) 

self.assertIs(exposure.getWcs(), None) 

 

 

def makeRampMaskedImage(width, height, imgClass=afwImage.MaskedImageF): 

"""Make a ramp image of the specified size and image class 

 

Image values start from 0 at the lower left corner and increase by 1 along rows 

Variance values equal image values + 100 

Mask values equal image values modulo 8 bits (leaving plenty of unused values) 

""" 

mi = imgClass(width, height) 

image = mi.getImage() 

mask = mi.getMask() 

variance = mi.getVariance() 

val = 0 

for yInd in range(height): 

for xInd in range(width): 

image[xInd, yInd, afwImage.LOCAL] = val 

variance[xInd, yInd, afwImage.LOCAL] = val + 100 

mask[xInd, yInd, afwImage.LOCAL] = val % 0x100 

val += 1 

return mi 

 

 

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

pass 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

107 ↛ 108line 107 didn't jump to line 108, because the condition on line 107 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()