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    • 8. 发明申请
    • Watermarking electronic text documents
    • 水印电子文本文件
    • US20050039021A1
    • 2005-02-17
    • US10871349
    • 2004-06-17
    • Adnan AlattarOsama Alattar
    • Adnan AlattarOsama Alattar
    • G06F17/22G06F17/24G06T1/00H04L9/00H04N1/32
    • G06F17/2294G06F17/241G06T1/005G06T2201/0051G06T2201/0062G06T2201/0065H04N1/32203H04N1/32219H04N2201/3233H04N2201/327H04N2201/328H04N2201/3284
    • A text watermarking method embeds an auxiliary message in an original electronic text document to form a watermarked text document. The method applies a spreading function to message symbols to spread the symbols over a carrier, which forms a modulated carrier. It maps elements of the modulated carrier to corresponding inter-word spaces in the electronic text document, and applies an embedding function to modify the corresponding inter-word spaces according to elements of the modulated carrier signal such that the modified inter-word spaces hide the modulated carrier signal in the watermarked text document. The message symbols are automatically decodable from the watermarked document without the original electronic text document. A compatible decoder extracts the auxiliary message from a printed or electronic watermarked text document. The decoder automatically measures inter-word spaces in the watermarked text document. It estimates elements of a modulated carrier signal embedded in the inter-word spaces to form an estimated modulated carrier signal, and applies a de-spreading function to the estimated modulated carrier signal to extract message symbols.
    • 文本水印方法在原始电子文本文档中嵌入辅助消息以形成水印文本文档。 该方法将扩展函数应用于消息符号,以便在形成调制载波的载波上扩展符号。 它将调制载波的元素映射到电子文本文档中的对应的字间空间,并且根据调制的载波信号的元素应用嵌入功能来修改对应的字间空间,使得修改的字间空间隐藏 在水印文本文档中调制载波信号。 消息符号可以从没有原始电子文本文档的水印文档中自动解码。 兼容解码器从打印或电子水印的文本文档中提取辅助消息。 解码器自动测量水印文本文档中的字间空格。 它估计嵌入在字间空间中的调制载波信号的元素以形成估计的调制载波信号,并且对估计的调制载波信号应用去扩展功能以提取消息符号。