发明名称 |
Methods and apparatus for embedding and detecting digital watermarks in a text document |
摘要 |
Disclosed are a method and apparatus for embedding or detecting watermarks in a text, which belong to the field of document protection. The method and apparatus overlay an additional layer of shade in a document for recording a large amount of information from watermarks. The shade comprises the dots arranged under certain rules. Shifts of the dots record each bit string within the watermark. According to the method and apparatus, a large amount of information can be embedded and the watermarks embedded in the shade are dispersed together with the document which can be digitized by a scanner for being detected. |
申请公布号 |
US8107129(B2) |
申请公布日期 |
2012.01.31 |
申请号 |
US20060095860 |
申请日期 |
2006.04.29 |
申请人 |
YANG BIN;SHI WENZHE;QI WENFA;CHENG SHENGYUAN;WANG LIDONG;PEKING UNIVERSITY FOUNDER GROUP CO., LTD.;BEIJING FOUNDER ELECTRONICS CO., LTD.;PEKING UNIVERSITY |
发明人 |
YANG BIN;SHI WENZHE;QI WENFA;CHENG SHENGYUAN;WANG LIDONG |
分类号 |
H04N1/405 |
主分类号 |
H04N1/405 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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