Digital watermark detection method and apparatus

Details Digital watermark detection method and apparatus Digital watermark detection method and apparatus

2007-05-23

2008-09-23

Smithers, Matthew B (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C382S190000

Reexamination Certificate

active

07428640

ABSTRACT:
A specific frequency component extraction unit extracts a specific frequency component signal from an input image signal. A phase controller controls the phase of the specific frequency component signal. A correlator computes the cross-correlation value of the phase-controlled specific frequency component signal and the input image signal. A watermark information estimation unit filters the cross-correlation value to detect watermark information embedded in the input image signal.

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