20080271620 | Printing Machine with Modular Additional Printing Group - There is described a web-fed or sheet-fed printing machine for security papers, in particular banknotes, comprising a machine frame in which is located a main printing group, the printing machine further comprising an additional printing group, independent of the main printing group, placed upstream of the main printing group with respect to a direction of displacement of the web or sheets for performing additional printing of the security papers prior to printing by said main printing group. The additional printing group comprises an inking module containing at least one inking device, and a printing module comprising a cylinder arrangement including a plurality of cylinders, the printing module being interposed between the inking module and the machine frame of the printing machine. The additional printing group is constructed in such a manner that the printing module can be decoupled from the inking module and the machine frame for replacement by another printing module without this requiring removal of said inking module from the printing machine. | 11-06-2008 |
20100195894 | Authentication of Security Documents, in Particular of Banknotes - There is described a method for checking the authenticity of security documents, in particular banknotes, wherein authentic security documents comprise security features printed, applied or otherwise provided on the security documents, which security features comprise characteristic visual features intrinsic to the processes used for producing the security documents. The method comprises the steps of (i) acquiring a sample image of at least one region of interest of the surface of a candidate document to be authenticated, which region of interest encompasses at least part of the security features, (ii) digitally processing the sample image by performing a decomposition of the sample image into at least one scale sub-space containing high resolution details of the sample image and extracting classifying features from the scale sub-space, and (iii) deriving an authenticity rating of the candidate document based on the extracted classifying features. | 08-05-2010 |