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• Example for module ImgAlgos::NDArrAverage

• See Module ImgAlgos::NDArrAverage

• The NDArrAverage module can be used for evaluation of averaged pedestals or background using dedicated runs.
  Typical configuration file may looks like this:

  No Format

  # Run this script: # psana -c psana-meca1113-r0045-cspad-cspad-dark-hotpix.cfg [psana] files = exp=meca1113:run=45 events = 400 #skip-events = 0 modules = CSPadPixCoords.CSPadNDArrProducer \ ImgAlgos.NDArrAverage \ ImgAlgos.Tahometer [CSPadPixCoords.CSPadNDArrProducer] source = MecTargetChamber.0:Cspad.0 inkey = outkey = cspad_ndarr outtype = int16 is_fullsize = yes print_bits = 3 [ImgAlgos.NDArrAverage] source = MecTargetChamber.0:Cspad.0 key = cspad_ndarr avefile = cspad.0-ave rmsfile = cspad.0-rms maskfile = cspad.0-msk hotpixfile = cspad.0-hot thr_rms_ADU = 10 thr_min_ADU = 4 thr_max_ADU = 10000 print_bits = 29 [ImgAlgos.Tahometer] dn = 100 print_bits = 7

• Evaluation of average intensity in 2 or 3 stages using gate-based algorithms excludes out-layers in intensity spectra and makes average more stable. However, the gate width is not a universal parameter. In order to set this parameter one has to look at spectrum of averaged intensities for particular device.  The same is valid for evaluation of hot/bad pixel masks. One has to plot spectra of averaged intensity and rms values. Averaged intensity and rms spectra for exp=meca1113:run=45 are shown on plots:

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Then decide how to set parameters for NDArrAverage algorithms, for example, it is quite save to use

• thr_rms_ADU = 10  – to discard very noisy pixels,
• thr_min_ADU = 4  – to discard presumably dead pixels with 0-intensity,
• thr_max_ADU = 10000 – to discard pixels with intensity significantly exceeding average value.

• Example for module ImgAlgos::ImgAverage

• See Module ImgAlgos::ImgAverage
• The ImgAverage module can be used for evaluation of averaged pedestals or background using dedicated runs. Typical configuration file may looks like this:

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