Lee Ka Young, Lee Joong, Kong Seong G, Kim Byounghyun
IT & Engineering Division, National Forensic Service, Seoul 158-707, South Korea.
IT & Engineering Division, National Forensic Service, Seoul 158-707, South Korea.
Forensic Sci Int. 2014 Jan;234:120-5. doi: 10.1016/j.forsciint.2013.11.003. Epub 2013 Nov 15.
This paper presents a technique to discriminate the sequence of stamped seal impression and ink-printed text in a document to detect falsely signed documents. In many Asian countries where a seal is widely used to endorse documents, a possibly forged document involves a seal impressed before the text is printed. The proposed method uses adhesive tapes with peel adhesion strength of approximately 25 oz/in. to exfoliate the top layer of the overlapping region of seal impression and ink-printed text in the document. A pair of digital images of the overlapping region, captured using an infinite focus microscope, is compared for color changes before and after the exfoliation with adhesive tapes. The proposed sequence discrimination index (SDI) measures the amount of color changes before and after the exfoliation to determine the sequence of seal impression and printed text. Experiment results show that the SDI successfully discriminates the sequence of seal impression and printed text for different types of ink cartridges and seal inkpads under various storage conditions, enabling forensic investigation of falsely signed documents with a seal.
本文提出了一种鉴别文件中印戳印章印记和油墨印刷文本顺序的技术，以检测伪造签名文件。在许多广泛使用印章来签署文件的亚洲国家，一份可能被伪造的文件涉及在文本打印之前加盖的印章。所提出的方法使用剥离粘附力约为25盎司/英寸的胶带，剥落文件中印戳印章印记和油墨印刷文本重叠区域的顶层。使用无限聚焦显微镜拍摄重叠区域的一对数字图像，比较用胶带剥落前后的颜色变化。所提出的顺序鉴别指数（SDI）测量剥落前后的颜色变化量，以确定印章印记和印刷文本的顺序。实验结果表明，SDI能够成功鉴别不同类型墨盒和印章印台在各种存储条件下印章印记和印刷文本的顺序，从而对带有印章的伪造签名文件进行法医调查。
