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(11) | EP 0 718 808 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Document authentication system |
| (57) 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. |