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科技與工程學院
圖文傳播學系
學位論文
學位論文
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http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/73898
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search.filters.author.Lin, Yu-Hsiang
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search.filters.author.林煜翔
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search.filters.subject.Digital Halftoning
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search.filters.subject.Dot Shifting
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search.filters.subject.Information Hiding
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search.filters.subject.Watermark
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search.filters.subject.數位半色調
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2007
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網點偏移在多角度資訊隱藏之研究
(
2007
)
林煜翔
;
Lin, Yu-Hsiang
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在資訊科技與複製技術的進步之下,從數位影像輸出至實體影像的品質已愈來愈高,使得文件的安全性受到挑戰。過去數位浮水印的機制多用於數位音訊、影像及視訊,若經由輸出及列印的過程,數位浮水印即很難保存在於實體的文件中。因此,本研究經數位半色調得單一色版之平網區域嵌入數位浮水印,並將同一區域中的網點,做不同角度的嵌入數位浮水印演算。主要根據所設計網點的位置偏移,與網點面積補償原理,以達到資訊隱藏之功能。由實驗結果發現,輸出成品可成功地以光學解碼工具,在同一區域不同角度解密,或由掃瞄器取樣再分析,而判讀出浮水印內容。此外,也將本研究這項技術實際應用於有價證券與產品設計上,進而增加防偽功能與提高附加價值。
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