On Fri, 19 Mar 2010 20:51:40 -0000, mrx said: > Consider a production line for printing anything that is used for access > control. Now providing there is absolutea consistency across every sample of > the > material printed/magnetised or otherwise marked during a production run, then > only one token need be scanned by laser. I thought the point was that there *wasn't* absolute consistency, and what was being measured was the deviations in each sample. A bigger concern is whether normal wear and tear will invalidate the measurements - some spots will be rubbed smoother by friction, others will be roughed up. Yes, the fine article says this: "This continued even after they were subjected to rough handling, including submersion in water, scorching, scrubbing with an abrasive cleaning pad and being scribbled on with thick black marker." But I wonder what several years of wear will do.
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