A robust image watermarking based on DWT-QR decomposition
Nan Lin, Jianjing Shen, Xiaofeng Guo, Jun Ping Zhou · 2011
In this paper, a novel optimal watermarking scheme based DWT and QR decomposition is presented. Before embedding the watermark, information was firstly encrypted to enhance the security and robustness. Then LL subband is blocked 8×8 after DWT transformation. When each of them is QR decomposed, the watermark is embedded in the first row elements of R matrix. The experimental results show that the algorithm has high robustness, invisibility and higher embedding capacity.