发明名称 |
Embedding and detection of digital watermarks |
摘要 |
A digital watermark detecting apparatus characterized by comprising:
a processing unit (41) which processes a detecting target by using a filter with a coefficient which is determined by a periodic number sequence;
a first cross-correlation calculator (43) which calculates a first cross-correlation between the processing result and the detecting target;
an auto-correlation calculator (35) which calculates an auto-correlation of the first cross-correlation;
a scaling rate calculator (72) which calculates a scaling rate based on a peak position of the auto-correlation and a period of the periodic number sequence;
a scaling unit (72) which scales one of the first cross-correlation and the periodic number sequence;
a second cross-correlation calculator (73) which calculates a second cross-correlation between the first cross-correlation scaled and the periodic number sequence not scaled or between the first cross-correlation not scaled and the periodic number sequence scaled; and
a detector (74) which detects whether a digital watermark is embedded in the detecting target based on the second cross-correlation. |
申请公布号 |
EP1643440(A2) |
申请公布日期 |
2006.04.05 |
申请号 |
EP20060000164 |
申请日期 |
2002.11.28 |
申请人 |
KABUSHIKI KAISHA TOSHIBA |
发明人 |
MURATANI, HIROFUMI;YAMAKAGE, TOMOO;YAMADA, HISASHI;KOTO, SHINICHIRO;KODAMA, TOMOYA;KAMBAYASHI, TOORU |
分类号 |
G06T1/00;H04N1/387;H04N7/08;H04N7/081 |
主分类号 |
G06T1/00 |
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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