I think so. Do you have the cross talk coefficients for every (CCD, Amp) pair? That’d tell us how important this is
All of the CP calibration products can be grabbed from ftp.
http://www.ctio.noao.edu/noao/content/DECam-Calibration-Files
Here’s the command:
ftp ftp://ftp.noao.edu/pub/valdes/DECamCPCalFiles150123/
I would attach the xtalk file, but discourse doesn’t support attaching files yet.
Not sure if this is a good idea, but I’m pasting in the full xtalk file:
# victim source x x_err src_nl poly_coeff
ccd25B ccd25A 1.34e-04 1.13e-05 4.078154e+04 1.537540e-04 -6.980507e-08 5.963848e-12
ccd25A ccd25B 3.16e-04 9.32e-06 4.038128e+04 8.826313e-04 -1.619436e-07 9.457412e-12
ccd26A ccd25A 2.95e-05 5.49e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd26A ccd25B 3.90e-05 3.28e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd26B ccd25B 4.10e-05 3.65e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd26B ccd26A -5.36e-04 6.86e-06 4.373232e+04 -6.703301e-04 3.463778e-08 9.838246e-13
ccd26A ccd26B 4.50e-04 7.61e-06 4.076989e+04 8.639303e-04 -1.609836e-07 1.079198e-11
ccd27A ccd26A 2.38e-05 3.12e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd27B ccd26B 2.27e-05 3.88e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd25B ccd27B -1.73e-05 5.30e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd26B ccd27A -2.31e-05 3.77e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd26A ccd27B -2.30e-05 6.04e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd27B ccd27A -7.18e-04 6.54e-06 4.493235e+04 -4.119533e-04 2.331235e-08 8.012798e-13
ccd27A ccd27B 4.47e-04 7.53e-06 4.477443e+04 5.793412e-04 -3.940148e-08 1.767087e-12
ccd32B ccd32A -8.28e-04 7.16e-06 4.235143e+04 -1.642225e-03 2.683240e-07 -1.266185e-11
ccd32A ccd32B 3.40e-04 6.32e-06 4.350554e+04 2.837990e-04 -1.316717e-08 2.130434e-12
ccd33B ccd33A 1.14e-04 5.61e-06 4.328240e+04 7.174996e-05 4.829730e-08 -3.226365e-12
ccd33A ccd33B 3.28e-04 6.41e-06 4.548654e+04 7.434658e-04 -1.614734e-07 1.313377e-11
ccd34A ccd33A 3.61e-05 2.65e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd34B ccd33B 3.05e-05 1.79e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd34B ccd34A -5.23e-04 6.34e-06 4.472627e+04 -6.161739e-04 1.275022e-07 -6.630950e-12
ccd34A ccd34B 1.39e-04 8.52e-06 4.314007e+04 4.483086e-05 -3.110871e-08 4.991906e-12
ccd04B ccd04A -4.76e-04 7.30e-06 4.000246e+04 -7.698136e-04 4.817214e-08 -5.138844e-13
ccd04A ccd04B 1.48e-04 1.18e-05 4.061272e+04 -1.640558e-04 5.410541e-08 -2.150999e-12
ccd04A ccd08A 3.86e-05 3.40e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd04B ccd08B 2.10e-05 3.22e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd08B ccd08A 1.10e-04 5.48e-06 4.061000e+04 2.363033e-04 -5.439024e-08 3.462319e-12
ccd08A ccd08B 2.50e-04 7.03e-06 4.545600e+04 1.506182e-04 -2.772457e-08 3.520614e-12
ccd13B ccd13A -7.52e-04 7.41e-06 4.091800e+04 -9.248876e-04 4.529715e-08 -7.223878e-14
ccd13A ccd13B 3.68e-04 5.28e-06 4.215807e+04 1.284040e-04 1.685578e-09 2.180761e-12
ccd14A ccd13A 3.27e-05 4.21e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd14B ccd13B 3.82e-05 4.35e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd04A ccd14A 3.58e-05 3.56e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd14B ccd14A -6.69e-04 5.79e-06 4.261907e+04 -1.085696e-03 1.151814e-07 -3.468178e-12
ccd14A ccd14B 5.42e-04 8.90e-06 4.119961e+04 4.155819e-04 -2.755728e-08 3.903702e-12
ccd19B ccd19A 1.56e-04 6.10e-06 4.273072e+04 -3.673395e-04 5.520903e-08 -7.037529e-13
ccd19A ccd19B 3.07e-04 7.31e-06 4.557400e+04 -4.371844e-04 1.394320e-07 -4.005219e-12
ccd20A ccd19A 3.63e-05 3.63e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd20A ccd19B 3.60e-05 4.79e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd20B ccd19B 3.98e-05 3.08e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd13A ccd20A 1.65e-05 4.01e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd13B ccd20B 2.68e-05 3.37e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd20B ccd20A -5.55e-04 7.07e-06 4.073200e+04 -1.154366e-03 1.365805e-07 -4.639454e-12
ccd20A ccd20B 4.41e-04 9.19e-06 4.062650e+04 3.416947e-04 -2.926711e-08 3.219866e-12
ccd39B ccd39A 3.41e-04 5.47e-06 4.324480e+04 -7.953314e-05 8.510185e-08 -3.924838e-12
ccd39A ccd39B 6.58e-04 1.10e-05 4.677212e+04 9.891268e-04 -1.287373e-07 1.259077e-11
ccd40A ccd39A 2.98e-05 4.01e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd40A ccd39B 2.03e-05 3.15e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd40B ccd39B 3.67e-05 3.16e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd40B ccd40A -5.70e-04 8.58e-06 4.140226e+04 -7.382333e-04 8.558701e-08 -3.091537e-12
ccd40A ccd40B 4.63e-04 6.32e-06 4.187307e+04 3.896951e-04 3.524695e-08 -2.698712e-12
ccd45A ccd40A 2.53e-05 2.35e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd45B ccd40B 3.46e-05 2.98e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd45B ccd45A -7.12e-04 4.77e-06 4.002995e+04 -1.052282e-03 5.778108e-08 -7.473609e-13
ccd45A ccd45B 4.84e-04 9.84e-06 4.927645e+04 6.848641e-04 -4.371973e-08 -1.367840e-12
ccd46B ccd45B 3.80e-05 2.48e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd39A ccd46A -2.90e-05 5.83e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd46B ccd46A -6.84e-04 4.10e-06 4.604700e+04 1.794597e-04 -6.552887e-07 1.445779e-10
ccd46A ccd46B 4.54e-04 9.50e-06 4.202477e+04 3.081697e-04 -1.486023e-07 2.413996e-11
ccd51B ccd51A 1.12e-04 4.97e-06 4.229637e+04 -7.621760e-05 5.317283e-08 -2.667998e-12
ccd51A ccd51B 3.40e-04 6.99e-06 4.575949e+04 5.373012e-04 -5.345298e-08 5.393547e-12
ccd56A ccd51A 3.45e-05 3.69e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd56B ccd51B 3.42e-05 3.28e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd56B ccd56A -4.88e-04 5.96e-06 4.053117e+04 -5.247658e-04 1.262565e-08 1.284578e-12
ccd56A ccd56B 1.73e-04 7.95e-06 4.484066e+04 3.399175e-04 -7.278292e-08 6.769633e-12
ccd17B ccd17A 1.91e-04 5.81e-06 4.346934e+04 -5.713013e-04 9.681892e-08 -3.194457e-12
ccd17A ccd17B 4.08e-04 9.73e-06 4.369112e+04 4.101070e-04 -1.938186e-09 2.884910e-12
ccd18A ccd17A 3.76e-05 2.56e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd18A ccd17B 9.66e-05 3.86e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd18B ccd18A -6.46e-04 4.85e-06 4.240534e+04 -1.103450e-03 1.659122e-07 -7.609292e-12
ccd18A ccd18B 1.27e-04 9.66e-06 4.516890e+04 3.508282e-04 -2.761238e-08 -2.123464e-12
ccd21B ccd21A 2.78e-04 8.01e-06 4.086850e+04 -3.603690e-04 5.800177e-08 -6.254689e-13
ccd21A ccd21B 3.86e-04 6.76e-06 4.356114e+04 1.019117e-05 4.712910e-08 3.005622e-13
ccd22A ccd21A 4.89e-05 1.75e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd22A ccd21B 1.15e-04 3.11e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd22B ccd21B 5.56e-05 2.22e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd22B ccd22A -4.92e-04 6.69e-06 4.645904e+04 -2.126832e-04 1.419536e-07 -1.051436e-11
ccd22A ccd22B 3.64e-04 7.00e-06 4.078500e+04 3.129247e-04 -2.944141e-08 3.184816e-12
ccd23A ccd22A 4.48e-05 4.16e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd23A ccd22B 7.04e-05 5.23e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd23B ccd22B 3.91e-05 3.39e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd23B ccd23A -9.18e-04 6.02e-06 4.219063e+04 -1.545775e-03 2.520741e-07 -1.278086e-11
ccd23A ccd23B 3.29e-04 9.37e-06 4.295030e+04 6.296770e-04 -8.378071e-08 7.049358e-12
ccd24A ccd23A 2.73e-05 3.77e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd24B ccd23B 7.05e-05 3.33e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd17A ccd24A 7.42e-05 3.42e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd24B ccd24A -6.80e-04 5.49e-06 4.868069e+04 9.344072e-04 -7.201574e-08 -3.782743e-12
ccd24A ccd24B 5.14e-04 8.10e-06 4.159671e+04 5.217194e-04 -2.244689e-08 3.250843e-12
ccd09B ccd09A -8.03e-04 6.09e-06 4.395924e+04 -1.466450e-03 2.551152e-07 -1.175802e-11
ccd09A ccd09B 3.56e-04 5.76e-06 4.422200e+04 1.469622e-04 -6.468155e-09 4.573219e-12
ccd10A ccd09A 4.31e-05 3.80e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd10A ccd09B 9.74e-05 4.63e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd10B ccd09B 4.53e-05 2.85e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd10B ccd10A -6.13e-04 5.22e-06 4.848351e+04 8.567096e-05 1.628971e-07 -2.254366e-11
ccd10A ccd10B 3.81e-04 6.67e-06 4.314500e+04 2.353910e-04 -2.671938e-08 4.970691e-12
ccd12A ccd10B 6.68e-05 2.92e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd11B ccd11A 9.75e-05 8.09e-06 4.230014e+04 -3.903789e-04 4.847455e-08 -5.969791e-13
ccd11A ccd11B 2.34e-04 7.34e-06 4.333001e+04 2.654903e-04 -3.853018e-08 5.984682e-12
ccd12A ccd11A 4.58e-05 2.76e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd12B ccd12A -5.16e-04 4.87e-06 4.062172e+04 -8.936608e-04 6.427286e-08 -7.840033e-13
ccd12A ccd12B 1.69e-04 8.61e-06 4.109660e+04 4.530215e-05 8.853301e-09 7.188464e-13
ccd15B ccd15A 2.26e-04 7.16e-06 4.129917e+04 -5.830054e-04 7.330805e-08 -9.993544e-13
ccd15A ccd15B 3.52e-04 6.02e-06 4.054287e+04 2.880225e-04 -1.733696e-08 2.780847e-12
ccd16A ccd15A 3.32e-05 3.36e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd16A ccd15B 1.19e-04 4.18e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd16B ccd15B 4.33e-05 3.53e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd09A ccd16A 2.07e-05 4.53e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd09B ccd16B 2.43e-05 2.49e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd11A ccd16B 6.38e-05 2.92e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd16B ccd16A -4.93e-04 7.29e-06 4.551762e+04 -4.856586e-04 1.718678e-07 -1.040271e-11
ccd16A ccd16B 4.12e-04 7.28e-06 4.254546e+04 7.454177e-04 -1.052059e-07 8.240842e-12
ccd01B ccd01A -6.47e-04 1.07e-05 4.060288e+04 -1.546081e-03 1.996199e-07 -6.782680e-12
ccd01A ccd01B 4.24e-04 7.68e-06 4.241862e+04 3.468559e-04 -3.372234e-08 4.094861e-12
ccd02A ccd01B 4.80e-05 2.67e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd07A ccd01A 1.61e-05 2.76e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd02B ccd02A 1.21e-04 8.62e-06 4.102851e+04 -1.106290e-04 -9.005856e-09 1.776275e-12
ccd02A ccd02B 3.12e-04 6.29e-06 4.454614e+04 1.110782e-05 5.331542e-08 5.149784e-13
ccd03A ccd02A 3.11e-05 3.43e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd03B ccd02B 6.03e-05 5.99e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd03B ccd03A -6.14e-04 5.53e-06 4.767256e+04 -5.339783e-05 1.963126e-08 -5.269723e-13
ccd03A ccd03B 1.57e-04 6.75e-06 4.108025e+04 4.779748e-05 -2.668258e-09 2.166123e-12
ccd05B ccd05A 2.93e-04 8.38e-06 4.085550e+04 -1.684165e-04 4.644177e-08 -7.459948e-13
ccd05A ccd05B 3.40e-04 4.98e-06 4.310301e+04 5.028621e-04 -6.255596e-08 6.021470e-12
ccd06A ccd05A 8.45e-05 2.99e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd06A ccd05B 1.88e-04 3.05e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd06B ccd05B 8.10e-05 2.89e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd03A ccd06B 7.09e-05 3.37e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd06B ccd06A -4.57e-04 6.25e-06 4.657035e+04 1.600874e-04 7.129154e-08 -5.802876e-12
ccd06A ccd06B 3.82e-04 8.72e-06 4.369817e+04 4.750609e-04 -6.183793e-08 6.949873e-12
ccd07A ccd06A 3.07e-05 2.48e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd07B ccd06B 2.85e-05 2.09e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd01A ccd07A 3.47e-05 5.38e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd01A ccd07B 3.01e-05 2.93e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd01B ccd07B 3.59e-05 3.24e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd07B ccd07A -9.67e-04 4.64e-06 4.172172e+04 -1.661753e-03 2.529592e-07 -1.192235e-11
ccd07A ccd07B 2.82e-04 4.26e-06 4.998422e+04 5.095241e-04 1.665938e-07 -1.822567e-11
ccd28B ccd28A 2.33e-04 5.38e-06 4.425677e+04 4.334732e-05 4.802789e-08 -1.171290e-12
ccd28A ccd28B 4.09e-04 5.41e-06 4.320150e+04 2.619608e-04 -1.421727e-08 3.935424e-12
ccd29A ccd28A 3.67e-05 4.37e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd29A ccd28B 1.21e-04 4.65e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd29B ccd28B 4.17e-05 3.60e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd29B ccd29A -3.78e-04 6.66e-06 4.264790e+04 -3.454996e-04 5.499426e-08 2.427540e-14
ccd29A ccd29B 5.11e-04 9.22e-06 4.458350e+04 2.697242e-04 1.164680e-08 4.739941e-12
ccd30A ccd29A 3.15e-05 5.98e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd30A ccd29B 8.16e-05 6.34e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd30B ccd29B 3.91e-05 4.96e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd29B ccd30A -1.72e-05 2.74e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd30B ccd30A -7.20e-04 6.69e-06 4.376449e+04 -9.961467e-04 2.362914e-07 -1.409822e-11
ccd30A ccd30B 3.16e-04 7.53e-06 4.173988e+04 -1.006230e-04 1.059128e-07 -5.259424e-12
ccd31A ccd30A 5.16e-05 5.99e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd31A ccd30B 1.11e-04 3.48e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd31B ccd30B 3.95e-05 3.21e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd31B ccd31A -6.71e-04 4.77e-06 4.537537e+04 -1.937764e-04 1.419847e-07 -1.082217e-11
ccd31A ccd31B 4.41e-04 6.18e-06 4.478605e+04 5.308792e-04 -1.066669e-08 2.969986e-12
ccd35B ccd35A 2.75e-04 8.23e-06 4.393930e+04 4.850432e-04 -6.022922e-08 6.088015e-12
ccd35A ccd35B 3.16e-04 7.62e-06 4.337013e+04 1.981332e-05 5.139773e-09 3.024289e-12
ccd36A ccd35A 2.43e-05 4.38e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd36B ccd35A 7.63e-05 2.39e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
ccd37B ccd35A -2.72e-05 3.70e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
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ccd58A ccd60A -2.41e-05 3.45e-06 1.000000e+10 0.000000e+00 0.000000e+00 0.000000e+00
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I googled but didn’t find the definitions of the columns. I’m assuming that they are a non-linear fit to the crosstalk, and http://www.ctio.noao.edu/noao/content/decam-known-problems implies that they used to have such an effect. I’m not sure if that was before they started correcting for quadratic non-linearity in the readout electronics
Non-linearity corrections should be there (I wrote it), and it’s supported in camGeom. @SimonKrughoff do you know anything about this?
The notes at http://www.ctio.noao.edu/noao/content/decam-known-problems imply that it used to be non-linear but now isn’t, so we’ll need to version camGeom – we can do this as an obs_decam version but as we know it’d be better in the nbutler.
We should be able to do this in the Old Butler; that’s one of the things that I think you wanted pushed after registry-less repositories (“more important than […] improvements to versioning”).
It’s 249 xtalk coefficients for 124 amps (62 chips, 2 amps each), so there are some non-negligible inter-chip cross-talk.
It isn’t the highest priority because we can version obs_decam if we must (ignoring Von Neumann’s strictures)
Looks to me like non-linearity corrections for HSC are done here, not in general-purpose ISR code: https://github.com/lsst/obs_subaru/blob/3452c1f7ab32105cbe465c4e5806f6da42d457fc/python/lsst/obs/subaru/isr.py
Right, just like crosstalk. So this needs to be copied/cherry-picked to obs_decam and we need to think about how to make this more generic or more easily extended or more easily plugged into. “Use this external cross-talk module from HSC in Decam”. Or something.
I noticed you specifically mentioned the Community Pipeline processing. Is the DES ISR different? Substantively or just in implementation?
It’s very similar. Actually the CP is a subset of the DESDM processing software. But DESDM only processes their own data, while the CP processes all the community data (and the documentation seems to be a bit better).
We do use the fringe code for HSC (it’s needed for y-band). It has been in ip_isr for ages now.
That’s great! Hopefully it’ll work for DECam as well.
Sorry for missing this conversation. Evidently the discourse emails got lost in the noise.
Regarding non-linearity, there was an implementation of this in ISR done long ago, but I don’t believe it ever satisfied all the requirements, thus the re-implementation in obs_subaru.
As far as inter-chip crosstalk goes, we don’t currently have a defined way to do this. I think we can probably work around it by getting relevant images from the butler inside the isr routine. From a very quick look, it seems that any amp is only affected by one other chip.
Great.
Yes, I think you are right about the the crosstalk. From the coefficients it just seems like one other (neighboring?) chip is affected.
I/O in the task code (and therefore passing in blobs such as dataRefs) is exactly the pattern I’m trying to move away from. In this short run it might be pragmatic though.
I agree that we should be moving away from that pattern, but I’m not sure how to make headway without having to produce a new crosstalk design. Maybe it’s easy. I haven’t had a chance to look.
I’ve been wondering if there’s a way to do cross-talk without having to pull in every image for every chip (in reality a chip only affects a small number of other chips). Only the pixels with lots of flux actually have a cross-talk effect. So I’m wondering if it would be possible to pull out all of the “bright” pixels (above a few thousand ADU or something like that) and put it in a smallish image/array/file that, of course, remembers the (x,y) coordinates of the pixels. Then you run through all the chips once and create these “bright pixel” files. When you run cross-talk on an individual chip you load in all of the bright pixels from all chips (which should not be very memory intensive), and remove the cross-talk just from those pixels (from chips that have non-negligible cross-talk coefficients). Does this sound doable/reasonable? Of course it breaks down in crowded fields.
There is currently the concept of a “heavy” footprint in the stack. This is essentially the minimum set of bounding boxes for a source and the pixels associated. I think that’s what you need.
That being said, I don’t think it would be hard to load the image you need inside the cross-talk method. It’s not very efficient, but I think the efficient mechanism needs a new design before we can do it in a non-hacky way.