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LSST Data Management Base Package
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Classes | |
class | PiffPsfDeterminerConfig |
class | PiffPsfDeterminerTask |
Functions | |
bool | _validateGalsimInterpolant (str name) |
getGoodPixels (maskedImage, zeroWeightMaskBits) | |
computeWeight (maskedImage, maxSNR, good) | |
applyMaxSNR (imArr, weightArr, good, maxSNR) | |
_computeWeightAlternative (maskedImage, maxSNR) | |
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protected |
Alternative algorithm for creating weight map. This version is equivalent to that used by Piff internally. The weight map it produces tends to leave a residual when removing the Poisson component due to the signal. We leave it here as a reference, but without intending that it be used (or be maintained).
Definition at line 240 of file piffPsfDeterminer.py.
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protected |
A helper function to validate the GalSim interpolant at config time. Parameters ---------- name : str The name of the interpolant to use from GalSim. Valid options are: galsim.Lanczos(N) or Lancsos(N), where N is a positive integer galsim.Linear galsim.Cubic galsim.Quintic galsim.Delta galsim.Nearest galsim.SincInterpolant Returns ------- is_valid : bool Whether the provided interpolant name is valid.
Definition at line 37 of file piffPsfDeterminer.py.
lsst.meas.extensions.piff.piffPsfDeterminer.applyMaxSNR | ( | imArr, | |
weightArr, | |||
good, | |||
maxSNR ) |
Rescale weight of bright stars to cap the computed SNR. Parameters ---------- imArr : `ndarray` Signal (image) array of stamp. weightArr : `ndarray` Weight map array. May be rescaled in place. good : `ndarray` Index array of pixels to use when computing SNR. maxSNR : `float` Threshold for adjusting variance plane implementing maximum SNR.
Definition at line 192 of file piffPsfDeterminer.py.
lsst.meas.extensions.piff.piffPsfDeterminer.computeWeight | ( | maskedImage, | |
maxSNR, | |||
good ) |
Derive a weight map without Poisson variance component due to signal. Parameters ---------- maskedImage : `afw.image.MaskedImage` PSF candidate postage stamp maxSNR : `float` Maximum SNR applying variance floor. good : `ndarray` Index array indicating good pixels. Returns ------- weightArr : `ndarry` Array to use for weight.
Definition at line 160 of file piffPsfDeterminer.py.
lsst.meas.extensions.piff.piffPsfDeterminer.getGoodPixels | ( | maskedImage, | |
zeroWeightMaskBits ) |
Compute an index array indicating good pixels to use. Parameters ---------- maskedImage : `afw.image.MaskedImage` PSF candidate postage stamp zeroWeightMaskBits : `List[str]` List of mask bits for which to set pixel weights to zero. Returns ------- good : `ndarray` Index array indicating good pixels.
Definition at line 133 of file piffPsfDeterminer.py.