Techniques for reading two dimensional code, including maxicode

Details Techniques for reading two dimensional code, including maxicode Techniques for reading two dimensional code, including maxicode

1998-10-22

2000-07-11

Pitts, Harold I.

Image analysis

Pattern recognition

Feature extraction

235494, G06K 946

Patent

active

060884827

ABSTRACT:
The disclosure relates to techniques for determining the presence, orientation and location of features in an image of a two dimensional optical code. The techniques are adapted for use in mapping data in an image pixel plane with grid locations in a grid-based two dimensional code to account for size, rotation, tilt, warping and distortion of the code symbol. Where such a code is a MaxiCode, techniques are disclosed for determining the presence and location of the MaxiCode bulls-eye, orientation modules, primary data modules and secondary data modules.

REFERENCES:
patent: 5637849 (1997-06-01), Wang et al.
patent: 5966463 (1999-10-01), Wang
A Two-Dimensional Bar Code Reader, N. Normand et al., IEEE 1051-4651/94, pp. 201-203 (1994).
IR-2000 Features & Specifications, Metanetics Corporation, MET02-002 Dec. 1996.
IMAGETEAM.RTM. 4400 Series, Welch Allyn, ISL 391 Rev. E, Jun. 1997.

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