Stability and Specificity of Counterfeit Protection System Code

In this study, the stability and specificity of a counterfeit protection system (CPS) code were determined. This research involved an analysis of a counterfeit protection system code unit over time using the pattern location measurement method. We collected 379 sample sheets from 196 printers or pho...

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Bibliographic Details
Published in:Journal of forensic sciences 2019-09, Vol.64 (5), p.1510-1519
Main Authors: Li, Jiang‐Chun, Fang, Fang, Han, Xing‐Zhou, Li, Biao, Han, Wei, Zhou, Qian
Format: Article
Language:English
Subjects:
Bedding
color laser print
Counterfeit
counterfeit protection system code
counterfeit protection system code pattern
Counterfeiting
forensic science
Photocopiers
questioned document
Stability
stability and specificity
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Summary:In this study, the stability and specificity of a counterfeit protection system (CPS) code were determined. This research involved an analysis of a counterfeit protection system code unit over time using the pattern location measurement method. We collected 379 sample sheets from 196 printers or photocopiers, covering 14 original brands, including 129 models. There was an interval of at least two months between the collections of samples from each machine. Four types of characteristics were established: CPS pattern unit, distance of the CPS unit, position of dots, size and shape of the dot. Except for the partial changes in the Xerox brand, no other brand exhibited changes over time. This implies that the CPS characteristics are stable. Meanwhile, no correlation was noted between the combinations of the characteristic systems in the collected samples, which implied strong specificity.
ISSN:0022-1198
1556-4029
DOI:10.1111/1556-4029.14051