Patent ID: 6535614
Filing Date: 2003-03-18
Classification: G06T,H04N

Abstract:
A method of reproducing electronic watermark information comprising the steps of:detecting a reference signal for detecting electronic watermark information from a recording medium having recorded thereon a video signal, the electronic watermark information being embedded in the video signal by alteration of a luminous value of a luminance signal included in the video signal, and the reference signal being inserted in the video signal at a position different from a position of embedment of the electronic watermark information; and modifying a luminous value of the electronic watermark information based on the reference signal;. wherein the modifying step includes the step of calculating a drop of a gain of the reference signal; and wherein the detecting step includes the steps of generating an electronic watermark information position detection signal based on a sync signal, and generating a reference signal position detection signal based on a sync signal.