惠普彩色激光打印文件跟踪暗码的实验研究

Research of Tracking Dots on Color Prints from Machines Made by Hewlett-Packard

利用彩色激光打印文件上跟踪暗码点分布规律可以分辨换页变造文件。以10种不同型号的HP彩色激光打印机印件为样本,用Matlab、Photoshop分别提取样本上的暗码,并进行基本模式图案的划分,发现同一机台打印件暗码的基本图案基本保持稳定,可以判断打印件的来源,检验文件真伪,但不能判断出具体的打印时间。

Using the distribution pattern of tracking dots to tell whether the color prints from Hewltt-Packard （HP） or not and make a distinction between question documents. Some samples were printed by using several different models of HP color laser printer. The tracking dots on color prints were extracted by two kinds of methods, ie Matlab program and Photoshop, the basic mode pattern of tracking dots were divided. We found that on the same machine prints, the basic pattern remained stable password, we can determine the source of prints, inspection documents authenticity, but can not determine the specific time of printing.