Method for detecting forged barcodes

Details Method for detecting forged barcodes Method for detecting forged barcodes

2006-10-05

2008-10-21

Lee, Michael G. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S462110, C235S437000, C235S462090, C235S462100, C235S462410, C382S289000, C382S296000

Reexamination Certificate

active

07438231

ABSTRACT:
A method of printing a two-dimensional barcode by tilting the print head, which results in tilted barcode, and methods of detecting various types of attempts to forge the tilted barcode including: (i) a low level forgery that consists of a simple scan and reprint of the barcode, (ii) a low level forgery that consists of a reproduction (i.e., a read and regeneration) and subsequent printing of the barcode using a printer with a non-tilted print head by a fraudster that is not aware of the tilt in the original barcode, and (iii) a higher level forgery by a fraudster that is aware of the tilt in the original barcode and that digitally tilts/shears an image of the barcode and prints the digitally tilted/sheared image using a printer with a non-tilted print head in an effort to mimic the tilt present in the legitimate barcode.

REFERENCES:
patent: 6533385 (2003-03-01), Mackay et al.
patent: 6612684 (2003-09-01), Mackay et al.
patent: 6688522 (2004-02-01), Philyaw et al.
IEEE Transactions on Pattern Analysis and Machine Intelligence. vol. 12, No. 7 Jul. 1990 Scale-Space and Edge Detection Using Anisotropic Diffusion.

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