Characterizing items of currency

摘要

Characterizing an item of currency employs a validation apparatus that includes at least three specified light sources for illuminating the item of currency. Each of the specified light sources has an emission spectrum similar to an approximating function for reconstructing a predetermined set of spectrum. At least one receiver receives light emitting from the at least three specified light sources. A transportation unit transports the item of currency within the validation apparatus. The light received by the receiver is at least one of light reflected by or light transmitted through the item of currency.

主权项

1. A validation apparatus comprising:
at least one broadband source for illuminating an item of currency; at least three specified physical filters, wherein each of the at least three specified physical filters has a transmission spectrum similar to at least one approximating function for reconstructing a predetermined reference spectrum, the reference spectrum being similar to an emission spectrum of at least a portion of a document, wherein each of the at least three specified filters filter light emitted from each respective broadband source such that the resulting transmission spectrum is similar to the predetermined reference spectrum; at least one receiver for receiving filtered light emitted from the at least one broadband source; a transportation unit for transporting the item of currency within the validation apparatus; wherein the at least three specified physical filters are positioned between the at least one broadband source and the at least one receiver; and wherein the light received by the at least one receiver is at least one of light reflected by or light transmitted through the item of currency.