In this paper, a new watermarking method based on spread spectrum technique, which we call capacious spread spectrum (CSS) is proposed. In this method, unlike the traditional spread spectrum watermarking (TSS), more than one pseudo noise (PN) sequence will be deployed. Also, a novel method to produce orthogonal PN-sequences is achieved. Moreover, it is shown that with utilizing the new approach, for the same watermarking capacity, the reconstruction error probability would be less than that of the TSS method.
['Hossein Fami Tafreshi', 'Reza Shakeri', 'Tamer Khattab']
Capacious spread spectrum watermarking utilizing hadamard matrix