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• in 263 mean(raw-peds) <0 for all events ~300
  1. mean intensity raising during the run, see cumulative image of 1000 events
  2. limits on intensity are different comparing to dark processing
• event-by-event variation of the image mean intensity is larger in FH than in FL
• outliers are still there both in dark and signal runs
• in 264 signal is well separated from base level

Correction which solves jitter of the mean value

ueddaq quad shows fluctuation of the baseline-mean image intensity from event by event.

Correction like common mode applied to entire image would solve this problem

arr = det.raw.calib(evt)

med = np.median(arr)
if fabs(med>thr_med_max): continue # discard deviation of median exceeding some threshold
arr -= med
<here apply per-pixel thresholds etc to arr>

# generate image from arr, if necessary
img = det.raw.image(evt, nda=arr)