Abstract:

Objective To study the various characteristics and its applications of office scanners left on the documents during scanning process. Methods By comparing the similarities and differences of various characteristics from the experimental samples of documents to be scanned, scanning documents and printing documents after scanning, then analyzed the external pattern and application value of the above characteristics. Results The defect features of the scanners are easily to be mixed with the  printing trace features. However the species traceability of inherent characteristics of the scanners are strong. Conclusion The inherent characteristics of the scanners are unique. It is not only an important species characteristics to determine whether the questioned documents to be inspected have been scanned, but also provides a basis for tracing the scanning devices.

Key words:

scanners, image sensor, inherent characteristics, defect characteristics

摘要：

目的 研究扫描打印文件上扫描瑕疵特征及扫描固有特征的价值及应用。方法 通过制作扫描母件、扫描电子文件以及扫描打印文件实验样本，比较上述样本中各扫描瑕疵特征及扫描固有特征之间的异同，分析各类扫描特征的形态表现与应用价值。结果 扫描瑕疵特征易与印刷痕迹特征发生混淆，而扫描固有特征具有较强的特异性，有助于判断待检文件的形成方式。结论 扫描特征中的固有特征能够有效确认待检文件是否存在扫描过程，并为待检文件溯源提供一定参考。

关键词:

扫描机具, 感光元件, 固有特征, 瑕疵特征