Data watermarks created by using an uneven sampling period

Details Data watermarks created by using an uneven sampling period Data watermarks created by using an uneven sampling period

2011-01-11

2011-01-11

Vu, Kimyen (Department: 2435)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S176000, C726S002000, C380S038000

Reexamination Certificate

active

07870390

ABSTRACT:
Input signals are electronically watermarked using an uneven or non-uniform sampling rate. The uneven or non-uniform sampling may be pseudo-random. The uneven or non-uniform sampling meets the Nyquist criterion so that aliasing and loss of content are avoided. The resulting sampling pattern in the sampled data is detectable by a comparison with the original source data.

REFERENCES:
patent: 4773092 (1988-09-01), Huang
patent: 5225904 (1993-07-01), Golin et al.
patent: 5245661 (1993-09-01), Lee et al.
patent: 5687236 (1997-11-01), Moskowitz et al.
patent: 5822432 (1998-10-01), Moskowitz et al.
patent: 5889868 (1999-03-01), Moskowitz et al.

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