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Forgery-Resistant Font for Electrophotographic Printing

IP.com Disclosure Number: IPCOM000101424D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Bruning, TE, III: AUTHOR [+3]

Abstract

Some printing applications for electrophotographic printers, such as checks or lottery tickets, are sensitive to forgery. Toner adhesion provided by electrophotographic printers rarely matches the performance capability of paper and ink. Described is a font design technique to prevent undetectable alterations to the forgery sensitive printing applications.

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Forgery-Resistant Font for Electrophotographic Printing

       Some printing applications for electrophotographic
printers, such as checks or lottery tickets, are sensitive to
forgery. Toner adhesion provided by electrophotographic printers
rarely matches the performance capability of paper and ink. Described
is a font design technique to prevent undetectable alterations to the
forgery sensitive printing applications.

      Fonts for electrophotographic printers are typically designed
by outlining the shape of each letter and then completely filling the
inside of the character with toner. The disclosed method for font
design does not completely fill the character.  Instead, once the
desired outline is selected for each character, it is filled with
lines or other special patterns.  Also, the area to the outside of
the character may or may not be filled with a special background
pattern.
      This technique provides the following advantages:
      1.   Characters susceptible to alteration, such as the numerals
3 and 8, may be designed with different fill patterns to assure
detectability of tampering.
      2.   Characters which are not completely filled with toner are
typically fused to the paper with greater strength than filled
characters.
      3.   When a printed background shade is used to surround the
printed characters, alteration of the outline of each character is
easily detected.
      4.   The appearance of fine line an...