Halftone patterns for trusted printing

Details Halftone patterns for trusted printing Halftone patterns for trusted printing

1998-01-29

1999-08-31

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Image transmission accuracy verification

358298, 358456, 358459, 382100, 382112, H04N 1405

Patent

active

059461039

ABSTRACT:
Predetermined machine and/or human readable information is embedded in at least one serpentine pattern that is printed on each original document, so that any given instance of such a document can be later verified or refuted as being the original by determining whether this information can be recovered from the document or not.

REFERENCES:
patent: 5171040 (1992-12-01), Orndorff
patent: 5315098 (1994-05-01), Tow
patent: 5374976 (1994-12-01), Spannenburg
patent: 5706099 (1998-01-01), Curry
patent: 5710636 (1998-01-01), Curry
patent: 5721788 (1998-02-01), Powell et al.
patent: 5734752 (1998-03-01), Knox
patent: 5790703 (1998-08-01), Wang
patent: 5828771 (1998-10-01), Bloomberg

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