Browse Prior Art Database

Microprint Signature Recognition

IP.com Disclosure Number: IPCOM000117200D
Original Publication Date: 1996-Jan-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 4 page(s) / 117K

Publishing Venue

IBM

Related People

Prakash, R: AUTHOR

Abstract

An automatable scheme is disclosed to establish the authenticity of a microprint signature on a document, e.g., a check. The technique works well with an electronic image of the microprint line, and can be applied to magnetic recording of the microprint line.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Microprint Signature Recognition

      An automatable scheme is disclosed to establish the
authenticity of a microprint signature on a document, e.g., a check.
The technique works well with an electronic image of the microprint
line, and can be applied to magnetic recording of the microprint
line.

      Use of microprint (print width of about 100-150 microns) is
generating much interest in the finance industry for fraud
prevention.  Since these types of print can only be produced by a dye
printing process (as compared to an all point addressable printer
e.g., the popular laser printers are limited due to their inherent EP
process), they are less vulnerable to being counterfeited.  Under
magnification, the printing is readable, and therefore allows for
establishing authenticity of the document.

      With electronic imaging entering the finance industry in a big
way; the limitation (due to scan resolution) of the image scanner to
capture microprint line for OCR or human readability, poses a
challenge.  Looking at the electronic image of the microprint line,
one cannot establish the document's authenticity by currently
available automated means.

      In this disclosure, a technique is proposed to recognize the
electronic image signature of the microprint line, using the normal
scanned image.  Furthermore, some alterations can be made to the
microprint line that will offer increased difficulty for
counterfeiting.

      In summary, the techniques calls for taking a fourier transform
of the integrated projected image.  The gaps between the words of the
microprint line result in video dips in the integrated projected
video.  The location of these dips is known from the print, and
translates into distinct & predictable spikes in the fourier spectrum
magnitudes.

      Presence of these spikes allows for establishing confidence
toward the authenticity of the document.

Following steps summarize the proposed technique:
  1.  Obtain the scanned image.  Using image analysis technique,
       establish a rectangular window around the microprint line.
The
       window is about 10 pixels high (at 400 d.p.i.), and as long as
       the microprint line (1060 in the example).
  2.  Sum up t...