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changes.mady.by.user Philip Hart

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  • par[0] - algorithm #
  • par[1] - maximal threshold on intensity to evaluate mean for low intensities
  • par[2] - maximal allowed common mode correction

  • par[3] - length of consecutive pixel array for common mode evaluation
    For example, for pnCCD one can evaluate common-mode for one came chip (128 channels):

    Code Block
    1 1000 1000 128
  • The algorithm loops over the data and evaluates consecutive arrays of specified length (which might represent for example a row of pixels in a readout chip) and finds the mean value for values below a threshold, ignoring masked pixels.  It corrects all the data if the calculated common mode is less than the maximal allowed correction.  The median algorithm is more stable in many cases and is recommended.

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