A Watermark Algorithm with Constant Robustness and Trellis Codes
结合网格编码的固定鲁棒性嵌入水印算法

In this paper,a new trellis coded watermarking algorithm of trellis codes combine with constant robustness embedding is proposed. In the algorithm,both informed coding and informed embedding are used. The watermark is encoded by a dirty-paper trellis encoder. Then the strength of the noise to be added to reduce the normalized correlation coefficient to a given threshold is computed,which is taken as a constant robustness parameter. The watermark signal is embedded into the cover work by Gram-Schmidt orthogonal algorithm under the condition of the constant robustness parameter,and Viterbi algorithm is used to detect and extract the watermarked signal. Experimental results indicate that the proposed algorithm can improve the robustness to white Gaussian noise and amplitude scaling.