lsst.ip.isr
16.0-22-g62d8060+6
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Classes | |
class | CrosstalkConfig |
class | CrosstalkTask |
class | NullCrosstalkTask |
Functions | |
def | extractAmp (image, amp, corner, isTrimmed=False) |
def | calculateBackground (mi, badPixels=["BAD"]) |
def | subtractCrosstalk (exposure, badPixels=["BAD"], minPixelToMask=45000, crosstalkStr="CROSSTALK") |
def | writeCrosstalkCoeffs (outputFileName, coeff, det=None, crosstalkName="Unknown", indent=2) |
Variables | |
dictionary | X_FLIP |
dictionary | Y_FLIP |
def lsst.ip.isr.crosstalk.calculateBackground | ( | mi, | |
badPixels = ["BAD"] |
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) |
Calculate median background in image Getting a great background model isn't important for crosstalk correction, since the crosstalk is at a low level. The median should be sufficient. Parameters ---------- mi : `lsst.afw.image.MaskedImage` MaskedImage for which to measure background. badPixels : `list` of `str` Mask planes to ignore. Returns ------- bg : `float` Median background level.
Definition at line 138 of file crosstalk.py.
def lsst.ip.isr.crosstalk.extractAmp | ( | image, | |
amp, | |||
corner, | |||
isTrimmed = False |
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) |
Return an image of the amp The returned image will have the amp's readout corner in the nominated `corner`. Parameters ---------- image : `lsst.afw.image.Image` or `lsst.afw.image.MaskedImage` Image containing the amplifier of interest. amp : `lsst.afw.table.AmpInfoRecord` Amplifier information. corner : `lsst.afw.table.ReadoutCorner` or `None` Corner in which to put the amp's readout corner, or `None` for no flipping. isTrimmed : `bool` The image is already trimmed. This should no longer be needed once DM-15409 is resolved. Returns ------- output : `lsst.afw.image.Image` Image of the amplifier in the standard configuration.
Definition at line 106 of file crosstalk.py.
def lsst.ip.isr.crosstalk.subtractCrosstalk | ( | exposure, | |
badPixels = ["BAD"] , |
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minPixelToMask = 45000 , |
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crosstalkStr = "CROSSTALK" |
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) |
Subtract the intra-CCD crosstalk from an exposure We set the mask plane indicated by ``crosstalkStr`` in a target amplifier for pixels in a source amplifier that exceed `minPixelToMask`. Note that the correction is applied to all pixels in the amplifier, but only those that have a substantial crosstalk are masked with ``crosstalkStr``. The uncorrected image is used as a template for correction. This is good enough if the crosstalk is small (e.g., coefficients < ~ 1e-3), but if it's larger you may want to iterate. Parameters ---------- exposure : `lsst.afw.image.Exposure` Exposure for which to subtract crosstalk. badPixels : `list` of `str` Mask planes to ignore. minPixelToMask : `float` Minimum pixel value in source amplifier for which to set ``crosstalkStr`` mask plane in target amplifier. crosstalkStr : `str` Mask plane name for pixels greatly modified by crosstalk.
Definition at line 162 of file crosstalk.py.
def lsst.ip.isr.crosstalk.writeCrosstalkCoeffs | ( | outputFileName, | |
coeff, | |||
det = None , |
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crosstalkName = "Unknown" , |
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indent = 2 |
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) |
Write a yaml file containing the crosstalk coefficients The coeff array is indexed by [i, j] where i and j are amplifiers corresponding to the amplifiers in det Parameters ---------- outputFileName : `str` Name of output yaml file coeff : `numpy.array(namp, namp)` numpy array of coefficients det : `lsst.afw.cameraGeom.Detector` Used to provide the list of amplifier names; if None use ['0', '1', ...] ccdType : `str` Name of CCD, used to index the yaml file If all CCDs are identical could be the type (e.g. ITL) indent : `int` Indent width to use when writing the yaml file
Definition at line 224 of file crosstalk.py.
dictionary lsst.ip.isr.crosstalk.X_FLIP |
Definition at line 95 of file crosstalk.py.
dictionary lsst.ip.isr.crosstalk.Y_FLIP |
Definition at line 97 of file crosstalk.py.