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.

 
Web www.patentalert.com

< Method of reducing a blocking artifact when coding moving picture

> Method of reducing a blocking artifact when coding moving picture

~ 00447