Measure intra-detector crosstalk.
See also
--------
lsst.ip.isr.crosstalk.CrosstalkCalib
lsst.cp.pipe.measureCrosstalk.CrosstalkExtractTask
lsst.cp.pipe.measureCrosstalk.CrosstalkSolveTask
Notes
-----
The crosstalk this method measures assumes that when a bright
pixel is found in one detector amplifier, all other detector
amplifiers may see a signal change in the same pixel location
(relative to the readout amplifier) as these other pixels are read
out at the same time.
After processing each input exposure through a limited set of ISR
stages, bright unmasked pixels above the threshold are identified.
The potential CT signal is found by taking the ratio of the
appropriate background-subtracted pixel value on the other
amplifiers to the input value on the source amplifier. If the
source amplifier has a large number of bright pixels as well, the
background level may be elevated, leading to poor ratio
measurements.
The set of ratios found between each pair of amplifiers across all
input exposures is then gathered to produce the final CT
coefficients. The sigma-clipped mean and sigma are returned from
these sets of ratios, with the coefficient to supply to the ISR
CrosstalkTask() being the multiplicative inverse of these values.
This Task simply calls the pipetask versions of the measure
crosstalk code.
Definition at line 724 of file measureCrosstalk.py.