发明名称 |
Method for inserting a watermark and associated decoding method |
摘要 |
<p>A method of determining a partition into distinct regions of a set of coefficients representative of at least a part of an image in order to insert a watermark comprises the following steps: generation (E501) of a centred pseudo-random sequence (w) equal in size to the cardinal number (N) of the said set of coefficients, formed from centred pseudo-random sub-sequences; modulation (E502) of the said set of coefficients by the said centred pseudo-random sequence (w) in order to insert the same information bit on the said set of coefficients; and checking (E504-E508), over each region, of a criterion of detectability of the information bit inserted by modulation. Use especially for determining an adaptative partition as a function of a criterion of detectability of an information bit inserted on each region. <IMAGE></p> |
申请公布号 |
EP1043687(A1) |
申请公布日期 |
2000.10.11 |
申请号 |
EP20000400949 |
申请日期 |
2000.04.06 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
DONESCU, IOANA;NGUYEN, ERIC;ONNO, PATRICE |
分类号 |
B41J29/00;B41J21/00;G06T1/00;H04N1/32;H04N1/387;H04N7/30;(IPC1-7):G06T1/00 |
主分类号 |
B41J29/00 |
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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