Design of A Robust Spread Spectrum Image Watermarking Scheme

Robustness is the key attribute of Spread Spectrum (SS) watermarking scheme. Several SS image watermarking algorithms have been proposed for multimedia signals but very few works have taken into consideration the issues responsible for robustness improvement. The current paper has critically analyzed few such factors namely properties of spreading codes, proper signal decomposition suitable for data embedding and the choice of modulation functions etc. that have greater impact on detection reliability. Based on the analysis robust SS watermarking scheme is proposed in wavelet domain and improvement in robustness performance is reported through experimental results. Proposed algorithm also shows improvement in visual and statistical invisibility of the hidden data.