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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。
The use of color laser printing documents track the distribution of the code point pattern can be identified pages to create documents. Taking 10 different types of HP color laser printers as samples, using Matlab and Photoshop to extract the passwords of the samples respectively and dividing the basic patterns, it was found that the basic patterns of the same machine print codes remained stable and could be judged Print the source, verify the authenticity of the file, but can not determine the specific print time.