| 摘要 |
Articles belonging to known calibration classes are fed, in any sequence, to a currency acceptor in order to derive measurements which are used for calibration purposes. The calibration articles are classified, preferably by normalising a number of the measurements using a further measurement as a normalisation factor, and then calculating a Mahalanobis distance using the normalised measurements. The measurements are prevented from being used for calibration purposes if an integrity check suggests that they are unreliable.
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