Paper sheet identification method and device
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United States of America Patent
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-
Mar 4, 2003
Grant Date -
N/A
app pub date -
Sep 28, 2000
filing date -
Sep 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed are a method and a device capable of high-precision identification of a color-copied paper sheet without increasing the amount of data extracted from the paper sheet. The method and device fox identifying a paper sheet radiate at least two lights having different wavelengths onto the paper sheet, detect light which has permeated therethrough or been reflected therefrom, detect a change in direction of the strength of the detected light, produce coded data, and identify the authenticity of the paper sheet by comparing said coded data with predetermined reference data.
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