Method for utilizing fragile watermark for enhanced security
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United States of America Patent
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Jan 30, 2007
Issued Date -
N/A
app pub date -
Nov 26, 2003
filing date -
May 8, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fragile watermark is embedded in a document. The fragile watermark provides enhance security. In one implementation, a method is provided for embedding information in an image so that the image will have different information when a scanning or printing process reproduces the image. The method includes embedding digital information in an image; printing the embedded digital information and the image to produce a original printed image; scanning the original printed image to obtain a digital image of the embedded information and the image; determining the signal strength of the original image; and comparing the signal strength of a printed image with the signal strength of the original printed image to determine whether or not the printed image is a copy of the original printed image.
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