发明名称 |
Digital watermark-embedding apparatus and method, digital watermark-detecting apparatus and method, and recording medium |
摘要 |
A digital image signal is divided into blocks. Each of the divided blocks is subjected to orthogonal transformation. As a result, the divided blocks are transformed into several frequency components. One or more frequency components are selected in accordance with a characteristic amount that is extracted from the several frequency components. Values of the selected frequency components are operated under a predetermined rule in accordance with an embedment signal that is generated from embedment information.
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申请公布号 |
US7356700(B2) |
申请公布日期 |
2008.04.08 |
申请号 |
US20030654492 |
申请日期 |
2003.09.04 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
NORIDOMI KENICHI;INOUE HISASHI;KATSURA TAKASHI;EJIMA MASATAKA |
分类号 |
H04L9/00;G06K9/46;G06T1/00 |
主分类号 |
H04L9/00 |
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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