发明名称 |
Digital watermark embedding apparatus, digital watermark extraction apparatus, and methods thereof |
摘要 |
A document image undergoes document analysis to obtain circumscribing rectangles of characters (S601), and two distances between non-neighboring circumscribing rectangles from the head of the document are respectively calculated as d1 and d2 (S603). If information to be embedded is 1, one or a combination of a process for changing a parameter associated with the size of a circumscribing rectangle and a process for changing a parameter associated with the position of a circumscribing rectangle is executed to satisfy d1>d2 (S605). If information to be embedded is 0, one or a combination of the above two parameter change processes is executed to satisfy d1<D2 (S606).
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申请公布号 |
US2003231786(A1) |
申请公布日期 |
2003.12.18 |
申请号 |
US20030456534 |
申请日期 |
2003.06.09 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
IWAMURA KEIICHI;KANEDA KITAHIRO;TAMARU JUN;EGUCHI TAKAMI |
分类号 |
G06T1/00;H04N1/387;(IPC1-7):G06K9/00 |
主分类号 |
G06T1/00 |
代理机构 |
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