METHOD AND SYSTEM FOR ENABLING COLLUSION RESISTANT WATERMARKING
摘要
A method and a system for modifying a bitstream signal for enabling collusion resistant bitstream watermarking. The method comprises dividing a bitstream spectral signal X[k] of the bitstream signal bx into a first signal (302) and a second signal (304); multiplying the first signal (302) by a first modification signal (306) and outputting a modified first signal (314); performing a transform operation on said second signal (304) for obtaining a transformed second signal (308); multiplying said transformed second signal (308) by a second modification signal (310) and outputting a second modified signal (312); subtracting said second modified signal (312) from said first modified signal (314) and outputting a modified bitstream spectral signal X'[k] suitable for obtaining a modified bitstream signal b'x of said bitstream signal bx. Thus an efficient manner of applying a collusion resistant property for already encoded contents is provided.
申请公布号
WO2007031939(A2)
申请公布日期
2007.03.22
申请号
WO2006IB53221
申请日期
2006.09.12
申请人
KONINKLIJKE PHILIPS ELECTRONICS N.V.;LEMMA, AWEKE, N.;VAN DER VEEN, MINNE