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Stability and Specificity of Counterfeit Protection System Code
Author(s) -
Li JiangChun,
Fang Fang,
Han XingZhou,
Li Biao,
Han Wei,
Zhou Qian
Publication year - 2019
Publication title -
journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.715
H-Index - 96
eISSN - 1556-4029
pISSN - 0022-1198
DOI - 10.1111/1556-4029.14051
Subject(s) - counterfeit , code (set theory) , stability (learning theory) , computer science , sample (material) , computer security , statistics , data mining , mathematics , geography , machine learning , chemistry , chromatography , archaeology , set (abstract data type) , programming language
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.