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The term digital watermark was coined by Andrew Tirkel and Charles Osborne in December 1992. The first successful embedding and extraction of a steganographic spread spectrum watermark was demonstrated in 1993 by Andrew Tirkel, Gerard Rankin, Ron Van Schyndel, Charles Osborne, and others.
A watermark is an identifying image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper. [1]
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New York Yankees pitching prospect Chase Hampton had Tommy John surgery Friday to repair his right elbow. Manager Aaron Boone announced the development after Friday's exhibition season opener.
Health & Place ] (]]]]) ]]]–]]] Proximity to point sources of environmental mercury release as a predictor of autism prevalence Raymond F. Palmera,, Stephen Blanchardb, Robert Wooda
A group of demonstrators wearing black clothing, some holding Nazi flags with swastikas, quickly left a Cincinnati-area overpass when they were confronted by residents Friday, video shows.
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Copy-evident documents have features that make it detectable that a copy is not the original.. In security printing, various methods such as void pantograph are used to create patterns that are hard to copy exactly and when copied inexactly produces an easily detectable image.