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LSST Data Management Base Package
|
Classes | |
class | PiffPsfDeterminerConfig |
class | PiffPsfDeterminerTask |
Functions | |
def | getGoodPixels (maskedImage, zeroWeightMaskBits) |
def | computeWeight (maskedImage, maxSNR, good) |
def | applyMaxSNR (imArr, weightArr, good, maxSNR) |
def 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 185 of file piffPsfDeterminer.py.
def 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 153 of file piffPsfDeterminer.py.
def 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 126 of file piffPsfDeterminer.py.