Interval centroid based watermark decoder

Details Interval centroid based watermark decoder Interval centroid based watermark decoder

2010-04-12

2010-11-09

Vu, Huy D (Department: 2461)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S509000, C713S176000, C713S401000, C713S500000, C713S501000

Reexamination Certificate

active

07830923

ABSTRACT:
An interval centroid-based watermark encoder encodes a watermark into a packet flow. Intervals are defined for the packet flow. Some of the intervals are selected as group A intervals while other intervals are selected as group B intervals. Group A and group B intervals are paired and assigned to watermark bits. A first or second value may be encoded by increasing the relative packet time between packets in either the group A (for the first bit value) or group B (for the second bit value) interval(s) of the interval pair(s) assigned to the watermark bits that are to represent the first or second bit value and the beginning of the same group interval(s). The relative packet times may be measured by a decoder and used to calculate a centroid difference for each interval pair. The centroid differences may be used to reconstruct the watermark.

REFERENCES:
patent: 6674861 (2004-01-01), Xu et al.
patent: 6683958 (2004-01-01), Petrovic
patent: 2003/0227987 (2003-12-01), Poletto et al.
patent: 2004/0064702 (2004-04-01), Yu et al.

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