DEVICE AND METHOD FOR INSERTING WATERMARKS IN CONTENTS AND FOR DETECTING INSERTED WATERMARKS
摘要
Provided are a device and method for detecting watermarks in content carrying watermarks. One method for watermark detection according to the present invention comprises the steps of: extracting the label of a frequency component of the content; generating a bit sequence by making bit values correspond on the basis of changes in the label being extracted; checking correlation while shifting the phase of the band-spreading code (pn sequence) with respect to the generated bit sequence; and checking the amount of phase shift in the band-spreading code at times when the correlation checked in this way falls into the category of autocorrelation, and then determining a bit group having a value corresponding to the amount of phase shift checked in this manner. The bit group determined in this way constitutes part of watermark data.
申请公布号
WO2011052992(A2)
申请公布日期
2011.05.05
申请号
WO2010KR07425
申请日期
2010.10.27
申请人
LG ELECTRONICS INC.;HWANG, INGU;SHIN, SUNGWOOK;KIM, JONGCHAN;OH, SEUNGKYUN;IM, JINSEOK;LIM, JUNGEUN