发明名称 |
QUANTIZATION INDEX MODULATION (QIM) DIGITAL WATERMARKING OF MULTIMEDIA SIGNALS |
摘要 |
<p>The invention addresses the problem of scale degradations that may occur in watermarking schemes based on quantization index modulation (QIM). In accordance with the invention, the quantization step size (D) being employed by the embedder (11) and detector (21) is derived (12, 22) from a measurable characteristic parameter which has the property that, when the applied signal is scaled by a factor (a), it is scaled by substantially the same factor. In a preferred embodiment, said parameter is the square root of the energy of the signal (), and the quantization step is a predetermined fraction (a) thereof.</p> |
申请公布号 |
WO03053064(A1) |
申请公布日期 |
2003.06.26 |
申请号 |
WO2002IB05498 |
申请日期 |
2002.12.12 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V.;KALKER, ANTONIUS, A., C., M. |
发明人 |
KALKER, ANTONIUS, A., C., M. |
分类号 |
G06T1/00;G10L11/00;G11B20/00;H04N1/387;H04N7/08;H04N7/081;H04N7/24;H04N7/26;H04N7/30;(IPC1-7):H04N7/26 |
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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