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文字图像和墨料FTIR图形模糊鉴别打印机型的误差分析


□ 王 宁 韩国强

  摘 要:通过实际案例的激光打印机打印文字,鉴别打印机型和打印机墨粉类型,分析打印文字图像或墨料(粉)FTIR图形单一鉴别与联合鉴别结果之间的误差率,评估两种鉴别方式的可靠性差异。方式一,用打印文字图像字域及其等方格分区的笔画比面积相关法模糊鉴别打印机型;方式二,用墨料傅里叶变换红外光谱(FTIR)图形吸收峰波数及其一二阶导数和自卷积相关法模糊鉴别打印机墨料种类。相对上述两种方式,计算出相关系数的距离,进行误差率的模糊综合分析。结果表明,单一鉴别方式与联合鉴别方式的误差率有显著差别。
  关键词:打印机; 文字图像; 墨料; 相关系数; 模糊鉴别; 误差分析
  中图分类号:TP391 文献标志码:A 文章编号:1001-3695(2008)08-2390-03
  
  Error analysis of printer fuzzy identification based on correlative
  specific area of character image & black-powder FTIR graphics
  WANG Ning1, 2, HAN Guo-qiang1
  (1.School of Computer Science & Engineering, South China University of Technology, Guangzhou 510641, China;2. Guangzhou Public Security Bureau, Guangzhou 510030, China)
  Abstract:This paper analyzed the error of two methods of printer fuzzy identification by a case of laser printer identification. By error analysis of single method and united method, it evaluated the reliability of two methods about printer identification. The first method, got the type of printer by fuzzy evaluation of correlative specific area of character image. The second method, idantified the printer by the similar FTIR spectrum graphics of black-powder of laser printer based on the wavenumbers, the first derivative, the second derivative and the self-deconvolution of FTIR spectrum graphics. With the calculation of correlation of above two methods, the error was analyzed by fuzzy synthetic evaluation about them. The result showed that the difference was obvious between single method and united method. ......
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