14. SPREAD SPECTRUM Where w i is element of watermark y is the watermarked signal A correlation detector is carried out to detect the presence of the watermark and is described by Eqn where N is vector cardinality Cont..
15. SPREAD SPECTRUM While x can be modelled as Gaussian random vector, the normalised correlation test is described as Eqn If p = 1, watermark is present If p=0, watermark is not present