发明名称 |
Method and arrangement for detecting a watermark |
摘要 |
A watermark detector is disclosed to judge whether multimedia content can be copied or not. The watermark detector examines the multimedia content and outputs a signal indicating whether a watermark is present or not. A decision variable indicating to which extent the watermark is present is determined, for example, the amount of correlation between the input signal and a reference copy of the watermark to be detected. The watermark is detected if the decision variable exceeds a predetermined threshold (y2). The detector also generates a random output signal for a predetermined range of decision values between the threshold (y2) and a further threshold (y1). |
申请公布号 |
IL128233(D0) |
申请公布日期 |
1999.11.30 |
申请号 |
IL19980128233 |
申请日期 |
1998.05.11 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
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分类号 |
H04N5/91;G06T1/00;H04N1/32;H04N1/387;H04N5/913;H04N7/08;H04N7/081 |
主分类号 |
H04N5/91 |
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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