摘要
目的暗记点阵形态特征研究一直是文件检验领域的难点和热点问题,但对利用暗记点阵形态特征鉴别彩色激光打印或复印文件的可行性问题还需要进一步探讨。本文通过光学显现法和扫描显现法对收集的9种品牌30种型号不同时间形成样本进行检验,对暗记点阵形态轮廓是否具有唯一性,暗记点阵形态特征是否会随着时间推移而发生变化展开讨论。方法利用VSC5000文件检验仪和Photoshop软件对样本进行显现,对各品牌彩色激光打印或复印文件生成的暗记点阵形态轮廓图,以及对同一机台在不同时间段生成的暗记点阵形态特征进行比较和分析。结果实验结果显示不同品牌彩色激光打印或复印文件暗记点阵形态轮廓图存在差异;同一机台在不同时间段生成的暗记点阵形态轮廓图未见差异。结论利用暗记点阵形态特征鉴别彩色激光打印或复印文件是科学的、可靠的,具有可行性,为种类鉴别、个体鉴别提供了理论依据。
Objective Characteristic code patterns are always the hot and difficult issue for questioned document examination.This paper tries to study the feasibility of identifying color laser printers/photocopiers and/or the relevant printed documents through outlining the involved instruments’code patterns and analyzing whether the code patterns are unique and vary with different printed time.Methods More than 130 samples,produced at the different time with 9-brand printers/photocopiers of 30 models,were collected to test by both the optical and scanning visualization.With the help of VSC5000 document inspector and Photoshop software,all the apparatus’code patterns were shown and analyzed from every tested samples produced by the above-mentioned instruments,along with the comparison among the code patterns given birth with a same printer/photocopiers at different time.Results There are very clear differences among the code patterns from the samples of 9 brands of printers/photocopiers.However,one same printer/photocopier depends on its brand and model to engender invariable or changed code patterns printed at different time.Conclusions Identification of color laser printer/copied document can be done by the apparatus’characteristic code pattern,demonstrating it is scientific,reliable and feasible.
作者
李江春
LI Jiangchun(Hubei University of Police,Wuhan 430035,China)
出处
《刑事技术》
2018年第2期114-122,共9页
Forensic Science and Technology
基金
公安部应用创新计划项目(NO.2015YYCXHBST019)
关键词
文件检验
暗记点阵形态特征
变化
可行性
questioned document examination
characteristic code pattern
variation
feasibility
