Spectrum Shaped Dither Modulation Watermarking for Correlated Host Signal

Spectrum shaping of watermark is necessary when the host signal is colored. This paper proposes a spectrum shaped dither modulation watermarking scheme. The covariance matrix of the watermark is scaled version of the host covariance matrix, so the corresponding spectrum of the watermark is proportional to the spectrum of the host signal. The performance of the proposed system is analyzed in terms of average probability of bit decoding error; closed form expression is derived. Theoretical analysis is finally validated by Monte Carlo simulation.