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- for each cspad2x1 sensor the pixels' intensity histogram is filled for natural ADU bins, pixels with bad status are ignored,
- search for the peak in the histogram corresponding to the dark pixels using thresholds,
- iterate over bins around the peak region and improve the peak location precision, that defines the common mode correction
- if correction is in allowed range then apply it to all sensor pixels.
- if the correction is not in the allowed range, then the common mode value is computed from unbonded pixels (see algorithm #5)
Control parameters for this algorithm resides in the file for common_mode calibration type;
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