Using Quantitative Characteristics of Document Images for Identiﬁcation of Laser Printers-Reference-Cited by-同舟云学术

Using Quantitative Characteristics of Document Images for Identiﬁcation of Laser Printers

Published:2021-07-30 Issue:2 Volume:16 Page:69-88
ISSN:2587-7275
Container-title:Theory and Practice of Forensic Science
language:
Short-container-title:Teor. prakt. sud. èkspert.

Author:

Petrov S. M.¹^ORCID

Affiliation:

1. Kaliningrad Laboratory of Forensic Science of the Ministry of Justice of the Russian Federation

Abstract

The article provides a brief overview of the current state of the theory and practice of identifying laser printers and the results of research work aimed at discovering individual features of the printing mechanism of a laser printer.The author analyses the scheme of a laser printer, describes the printing cycle, presents the main results of the analysis of a printer’s mechanism and the inﬂuence of its individual parts on the optical density of printing. The method of assessment of the optical density of the print by the digital image of the printed document is proposed, the complex of the necessary technical and program tools is described.A hypothesis on the correlation between ﬂuctuations in the optical density of printing of solid ﬁlls and ﬂuctuations in the area of printed elements was put forward and conﬁrmed; a visual representation of the study results in graphical form is presented, the relationship between the shape of the obtained graphs and defects of the printer’s components and parts is substantiated. The author proposes ways to detect the inhomogeneity of printing density on text arrays based on changes in the area of printed elements and processing of the results, which allows comparing distributions for texts printed in fonts of diﬀerent sizes and styles. Based on experimental material, the individuality of the form of the obtained distributions and the possibility of their use as identifying features of the printing device are substantiated.

Publisher

Russian Federal Centre of Forensic Science of the Ministry of Justice (RFCFS)

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