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<p>[QUOTE=&quot;Collecting Nut, post: 2625370, member: 74863&quot;]This was copied from a 2009 study by the BEP:</p><p><b>EXECUTIVE SUMMARY</b></p><p>The Bureau of Engraving and Printing (BEP), a bureau within the United States (U.S.) Department of the Treasury, is responsible for designing and producing the U.S. Federal Reserve notes (hereafter referred to as U.S. currency). The BEP initiated this study to examine various aspects of the use of U.S. currency by the blind and visually impaired (VI) population of the U.S.</p><p><b>5.3 Machine-Readable Features</b></p><p>Machine-readable features have been investigated for both blind and VI people to address the key usage scenarios (i.e., quick inventory and public transactions). The effect of paper manufacturing processes on the detection accuracy of a machine-readable feature is an implementation risk for a device that depends on light transmission. However, new machine-readable features could enable manufacturers to develop new currency reader device technologies that blind and VI people might be more inclined to use (see Section 4.2.2 for survey participant perceptions of devices).</p><p>Large banknote counting machines, such as those used at the FRB and in banking operations, employ machine-readable features as part of their high speed authentication or counting process. One machine-readable feature is magnetic ink, where each denomination generates a distinctive magnetic field. Another such feature, with fluorescent properties, can be detected by ultraviolet scanning technology. Sensitive digital cameras, such as those employed on cell phone currency readers, can reference the optical patterns in notes against a database of authentic patterns. The ARINC team did not identify any handheld devices employing machine-readable features that have been developed on a commercial scale. Although there is a Canadian currency reader device provided by the Canadian government, it was not developed on a commercial scale and is not available to the general public. Potential manufacturers indicated that the unknown size of a commercial market is a limiting factor in development of such a device.</p><p><br /></p><p>Hope this helps.[/QUOTE]</p><p><br /></p>

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