Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2011-02-01
2011-02-01
Lee, Thomas D (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003190
Reexamination Certificate
active
07880934
ABSTRACT:
A form of stochastic random distribution is used to print an invisible watermark using a typical, e.g., 600 dpi, printer. The watermark contains such information as “Do Not Copy,” or other such information. Although the watermark is not visible on a first generation version of a document that is printed, various techniques are used to print the watermark in such a way that it becomes readily apparent when the first generation document is photocopied. The preferred embodiment of the invention is concerned with a technique for improving such techniques, for example so that gray levels are improved to address variations from printer to printer. Another preferred embodiment of the invention is also concerned with a technique for performing error diffusion watermarking without the need for performing a calibration step.
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Brinich Stephen M
Electronics For Imaging, Inc.
Glenn Michael A.
Glenn Patent Group
Lee Thomas D
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