SoW: A hybrid DWT-SVD based secured image watermarking

The proposed SoW algorithm is based on the scheme present in [5]. Kamble et al. split the watermark into two shares and apply 1-level DWT and performed SVD on the HH subbands. While in our algorithm, the watermark is split into four shares, 2-level DWT is applied SVD is performed on the HL/LH subbands. The reason why the watermark is split into four shares in our algorithm is that, once the watermark undergoes serious damage, we still can reconstruct the watermark by comparing the corresponding pixels of the four shares.