Title:
SYSTEM AND METHOD FOR DISCOURAGING COPYING BY RECURRING QUANTIZATION LOSS
Document Type and Number:
WIPO Patent Application WO2004102951
Kind Code:
A3
Abstract:
The present invention alters a signal slightly after the decoding step so that the quantization loss is made recurring while not obvious to a human viewer of the decoded signal. The slightly altered signal, when re-encoded, is degraded enough to be annoying, without the measures being perceived in the first decoded signal. The present invention can be applied to a decoded digital signal if sufficient register space is available or to an analog signal after AD conversion.
Inventors:
FONTIJN WILHELMUS F J (NL)
Application Number:
PCT/IB2004/001591
Publication Date:
March 31, 2005
Filing Date:
May 03, 2004
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS CORP (US)
FONTIJN WILHELMUS F J (NL)
PHILIPS CORP (US)
FONTIJN WILHELMUS F J (NL)
International Classes:
G11B20/00; H04N5/913; (IPC1-7): G11B20/00; H04N5/913
Foreign References:
| EP0915620A1 | 1999-05-12 | |||
| EP0948204A2 | 1999-10-06 | |||
| EP1187478A2 | 2002-03-13 | |||
| US5757910A | 1998-05-26 |
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