Adaptive watermarking

Details Adaptive watermarking Adaptive watermarking

2007-08-21

2007-08-21

Arani, Taghi T. (Department: 2139)

Cryptography

Video cryptography

Video electric signal modification

C380S200000, C713S179000, C382S100000, C370S231000

Reexamination Certificate

active

10532911

ABSTRACT:
A method and apparatus (200) for embedding a watermark in an information signal bit-stream are described. The method comprises receiving a portion of an information signal bit-stream (MPEG2). A first copy of the received portion is stored in a first buffer (220). A second copy of the received portion is watermarked, and the resulting watermarked signal stored in a second buffer (240). At predetermined intervals, a check is performed to determine if the bit-rate of the received portion has been changed by being watermarked. If the check determines the bit-rate has changed, the first copy of the received portion from the first buffer is output. Otherwise the watermarked signal from the second buffer is output.

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patent: WO 02/060182 (2002-08-01), None

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