LSST Applications 27.0.0,g0265f82a02+469cd937ee,g02d81e74bb+21ad69e7e1,g1470d8bcf6+cbe83ee85a,g2079a07aa2+e67c6346a6,g212a7c68fe+04a9158687,g2305ad1205+94392ce272,g295015adf3+81dd352a9d,g2bbee38e9b+469cd937ee,g337abbeb29+469cd937ee,g3939d97d7f+72a9f7b576,g487adcacf7+71499e7cba,g50ff169b8f+5929b3527e,g52b1c1532d+a6fc98d2e7,g591dd9f2cf+df404f777f,g5a732f18d5+be83d3ecdb,g64a986408d+21ad69e7e1,g858d7b2824+21ad69e7e1,g8a8a8dda67+a6fc98d2e7,g99cad8db69+f62e5b0af5,g9ddcbc5298+d4bad12328,ga1e77700b3+9c366c4306,ga8c6da7877+71e4819109,gb0e22166c9+25ba2f69a1,gb6a65358fc+469cd937ee,gbb8dafda3b+69d3c0e320,gc07e1c2157+a98bf949bb,gc120e1dc64+615ec43309,gc28159a63d+469cd937ee,gcf0d15dbbd+72a9f7b576,gdaeeff99f8+a38ce5ea23,ge6526c86ff+3a7c1ac5f1,ge79ae78c31+469cd937ee,gee10cc3b42+a6fc98d2e7,gf1cff7945b+21ad69e7e1,gfbcc870c63+9a11dc8c8f
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 246 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 198 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. See Also -------- `lsst.meas.algorithms.variance_plance.remove_signal_from_variance` : Remove the Poisson contribution from sources in the variance plane of an Exposure.
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.