Low visibility watermark using time decay fluorescence
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 7, 2006
Issued Date -
N/A
app pub date -
Apr 5, 2004
filing date -
Apr 19, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A physical object is embedded with a first digital watermark component and a second digital watermark component. The first component is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second component is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The first component is detected after the first emission decay time, but before the second emission decay time.
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