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題名 | 改良式視覺簽章核對方法=An Improved Method for Visual Signature Checking |
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作者 | 杜維昌; 葉則承; | 書刊名 | 資訊管理展望 |
卷期 | 5:1 2003.03[民92.03] |
頁次 | 頁63-78 |
分類號 | 312.76 |
關鍵詞 | 視覺簽章核對; 色層分佈; 資訊安全; 影像認證; Visual signature checking; Dithering; Information security; Image authentication; |
語文 | 中文(Chinese) |
中文摘要 | 所謂「視覺簽章核對」的認證技巧是利用兩張透明黑白影像的疊合,以人類視覺方式獲 取秘密簽章。由於傳統方法所得到的簽章容易與背景影像相混合而難以分辨,所以我們 以影像的色層分佈為基礎,提出一種名為「中間值保留」的方法來確保浮現簽章的完整 性與清晰度。同時,我們延伸以往兩疊合影像必須屬於同一類型的限制,以期得到更廣 闊的應用範圍。在安全性方面,我們將以理論分析雜訊與安全性的關係,來突破傳統在 公開影像張數上的限制,我們將從理論與實驗角度來驗證所提方法的具體成效。 |
英文摘要 | “Visual signature checking” is an authentication technique which can be used to recognize the specified signature via human visual system by overlapping two transparent images. Since traditional methods often suffer from cloudy signature, a new method called the median reservation method based on the pattern dithered approach is proposed to enhance the integrity and legibility of the revealed signature. We also expand the original restriction on selecting the dummy images to provide a general solution. Moreover, some strategies are given to ensure the security of this scheme. Compared with conventional ones, the proposed methods have better results in legibility of recovered signature and extend the allowable number of public images under the requirement of security. Some experimental results will be shown to demonstrate these results. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。