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目的:获取整幅A4纸上完整暗码点图案,为利用暗码点对彩色激光打印文件检验鉴定提供前处理工作,并对得到的暗码点图案进行解析。方法:采用MATLAB程序和Photoshop图像处理软件两种方法提取彩色激光打印文件上的暗码点,对影响提取暗码点的因素进行实验研究。结果:暗码点的提取主要受打印纸张的白度、打印文件内容、打印机本身、扫描仪分辨率、容差设置等因素的影响,HP CP5525dn、HP CP4525dn打印机打印文件上暗码点包含品牌信息、不包含时间信息,依据提取到的暗码点可以区分不同品牌以及同一品牌不同型号彩色激光打印文件。
OBJECTIVE: To obtain the complete pattern of dark dots on the entire A4 paper, to provide preprocessing for the verification and identification of color laser printed documents by using the dark dots, and to analyze the pattern of the obtained dark dots. Methods: Two kinds of methods of MATLAB program and Photoshop image processing software were used to extract the dark code points on the color laser print files, and the factors affecting the extraction of dark code points were studied experimentally. Results: The extraction of the code point is mainly affected by factors such as the whiteness of the printing paper, the content of the printing document, the printer itself, the resolution of the scanner, the tolerance setting and other factors. The code point on the HP CP5525dn, HP CP4525dn printer contains the brand information, Contains time information, based on the extracted code points can distinguish between different brands and different models of the same brand of color laser printing documents.