| 摘要 |
Articles of currency are measured and the measurements then used to determine whether the articles belong to any of a plurality of respective target classes. A decision is made as to whether the article is to be rejected or accepted. A verification procedure is then carried out to determine, with greater reliability, whether the article belongs to any of the target classes, irrespective of whether the article was accepted or rejected. The verification procedure involves a plurality of measurements together with correlation data representing the expected correlations between the measurements based on populations of target classes. The selection of measurements is dependent upon the target class under consideration.
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