| 摘要 |
In a system for authenticating documents (12), such as banknotes, cheques or the like, a document (12) to be tested is driven past a sensing station (20) which provides a digital colour image of the document which is stored in a memory (38), in the form of plurality of digital images obtained by illuminating the document (12) with light of different colours. The stored colour image is processed using template matching, for example, to determine the type and orientation of the document (12). The type and orientation information is utilized to select a plurality of areas of the digital colour image for colour intensity analysis. For example, a statistical testing procedure using stored values derived from processing genuine documents may be utilised. Documents of different types are thus all processed in a uniform manner. <IMAGE> |
