Method for classifying documents, especially banknotes, for use in automatic banknote processing machines, in which to speed and improve classification, only the most significant characteristics are used for sorting

摘要

A banknote type is determined from a number of possible types, based on the characteristics (12) of the documents (10) being classified. To classify the documents characteristics are selected that are more significant than the remaining document characteristics and the documents are then classified using the most significant characteristics. An optimum characterization process is based on principle component analysis (PCA) in which a separate adaptation process is undertaken using reference documents. Their characteristics are combined to form reference vectors which can then be compared to the significant components corresponding to the characteristics of the documents to be classified.