Coverage for tests/test_register.py : 19%

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# # LSST Data Management System # Copyright 2008-2013 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/>. #
"""A test case for RegisterTask."""
self.dx = -5 self.dy = +3 self.numSources = 123 self.border = 10 # Must be larger than dx,dy self.width = 1000 self.height = 1000 self.pixelScale = 0.1 * afwGeom.arcseconds # So dx,dy is not larger than RegisterConfig.matchRadius
del self.pixelScale
"""Create test images and sources
We will create two fake images with some 'sources', which are just single bright pixels. The images will have the same sources with a constant offset between them. The WCSes of the two images are identical, despite the offset; this simulates a small e.g., pointing error, or misalignment that the RegisterTask should rectify. """ np.random.seed(0) templateImage = afwImage.MaskedImageF(self.width, self.height) templateImage.set(0) inputImage = afwImage.MaskedImageF(self.width, self.height) inputImage.set(0)
templateArray = templateImage.getImage().getArray() inputArray = inputImage.getImage().getArray()
# Sources are at integer positions to ensure warped pixels have value of unity xTemplate = np.random.randint(self.border, self.width - self.border, self.numSources) yTemplate = np.random.randint(self.border, self.width - self.border, self.numSources) xInput = xTemplate + self.dx yInput = yTemplate + self.dy
# Note: numpy indices are backwards: [y,x] templateArray[(yTemplate).astype(int), (xTemplate).astype(int)] = 1 inputArray[(yInput).astype(int), (xInput).astype(int)] = 1
# Create WCSes centerCoord = afwGeom.SpherePoint(0, 0, afwGeom.degrees) centerPixel = afwGeom.Point2D(self.width/2, self.height/2) cdMatrix = afwGeom.makeCdMatrix(scale=self.pixelScale) wcs = afwGeom.makeSkyWcs(crpix=centerPixel, crval=centerCoord, cdMatrix=cdMatrix)
# Note that one of the WCSes must be "wrong", since they are the same, but the sources are offset. # It is the job of the RegisterTask to align the images, despite the "wrong" WCS. templateExp = afwImage.makeExposure(templateImage, wcs) inputExp = afwImage.makeExposure(inputImage, wcs)
# Generate catalogues schema = afwTable.SourceTable.makeMinimalSchema() centroidKey = afwTable.Point2DKey.addFields(schema, "center", "center", "pixel")
def newCatalog(): catalog = afwTable.SourceCatalog(schema) catalog.getTable().defineCentroid("center") return catalog
templateSources = newCatalog() inputSources = newCatalog()
coordKey = templateSources.getCoordKey() for xt, yt, xi, yi in zip(xTemplate, yTemplate, xInput, yInput): tRecord = templateSources.addNew() iRecord = inputSources.addNew()
tPoint = afwGeom.Point2D(float(xt), float(yt)) iPoint = afwGeom.Point2D(float(xi), float(yi))
tRecord.set(centroidKey, tPoint) iRecord.set(centroidKey, iPoint) tRecord.set(coordKey, wcs.pixelToSky(tPoint)) iRecord.set(coordKey, wcs.pixelToSky(iPoint))
self.showImage(inputExp, inputSources, "Input", 1) self.showImage(templateExp, templateSources, "Template", 2)
return Struct(xInput=xInput, yInput=yInput, xTemplate=xTemplate, yTemplate=yTemplate, wcs=wcs, inputExp=inputExp, inputSources=inputSources, templateExp=templateExp, templateSources=templateSources)
"""Run the task on the data""" config.sipOrder = 2 task = RegisterTask(name="register", config=config) results = task.run(inData.inputSources, inData.inputExp.getWcs(), inData.inputExp.getBBox(afwImage.LOCAL), inData.templateSources) warpedExp = task.warpExposure(inData.inputExp, results.wcs, inData.templateExp.getWcs(), inData.templateExp.getBBox(afwImage.LOCAL)) warpedSources = task.warpSources(inData.inputSources, results.wcs, inData.templateExp.getWcs(), inData.templateExp.getBBox(afwImage.LOCAL))
self.showImage(warpedExp, warpedSources, "Aligned", 3) return Struct(warpedExp=warpedExp, warpedSources=warpedSources, matches=results.matches, wcs=results.wcs, task=task)
"""Assert that the registration task is registering images""" xTemplate = np.array([x for i, x in enumerate(inData.xTemplate) if i not in bad]) yTemplate = np.array([y for i, y in enumerate(inData.yTemplate) if i not in bad]) alignedArray = outData.warpedExp.getMaskedImage().getImage().getArray() self.assertTrue((alignedArray[yTemplate, xTemplate] == 1.0).all()) for dx in (-1, 0, +1): for dy in range(-1, 0, +1): # The density of points is such that I can assume that no point is next to another. # The values are not quite zero because the "image" is undersampled, so we get ringing. self.assertTrue((alignedArray[yTemplate+dy, xTemplate+dx] < 0.1).all())
xAligned = np.array([x for i, x in enumerate(outData.warpedSources["center_x"]) if i not in bad]) yAligned = np.array([y for i, y in enumerate(outData.warpedSources["center_y"]) if i not in bad]) self.assertAlmostEqual((xAligned - xTemplate).mean(), 0, 8) self.assertAlmostEqual((xAligned - xTemplate).std(), 0, 8) self.assertAlmostEqual((yAligned - yTemplate).mean(), 0, 8) self.assertAlmostEqual((yAligned - yTemplate).std(), 0, 8)
"""Assert that the registration task is populating the metadata""" metadata = outData.task.metadata self.assertEqual(metadata.getScalar("MATCH_NUM"), self.numSources) self.assertAlmostEqual(metadata.getScalar("SIP_RMS"), 0.0) self.assertEqual(metadata.getScalar("SIP_GOOD"), self.numSources-numRejected) self.assertEqual(metadata.getScalar("SIP_REJECTED"), numRejected)
"""Test image registration""" inData = self.create() outData = self.runTask(inData) self.assertRegistered(inData, outData) self.assertMetadata(outData)
"""Test image registration with rejection""" inData = self.create()
# Tweak a source to have a bad offset badIndex = 111
coordKey = inData.inputSources[badIndex].getTable().getCoordKey() centroidKey = inData.inputSources[badIndex].getTable().getCentroidKey() x, y = float(inData.xInput[badIndex] + 0.01), float(inData.yInput[badIndex] - 0.01) point = afwGeom.Point2D(x, y) inData.inputSources[badIndex].set(centroidKey, point) inData.inputSources[badIndex].set(coordKey, inData.wcs.pixelToSky(point))
config = RegisterConfig() config.sipRej = 10.0
outData = self.runTask(inData) self.assertRegistered(inData, outData, bad=set([badIndex])) self.assertMetadata(outData, numRejected=1)
"""Display an image
Images are only displayed if 'display' is turned on.
@param image: Image to display @param sources: Sources to mark on the display @param title: Title to give frame @param frame: Frame on which to display """ if not display: return ds9.mtv(image, title=title, frame=frame) with ds9.Buffering(): for s in sources: center = s.getCentroid() ds9.dot("o", center.getX(), center.getY(), frame=frame)
lsst.utils.tests.init()
lsst.utils.tests.init() unittest.main() |