【摘要】 该文阐述了扩频和量化两类嵌入算法的基本原理,并选择各自典型代表算法加性扩频算法和抖动调制量化算法基于MATLAB具体实现,实验比较在分块DCT变换下两种嵌入算法的鲁棒性能。结果表明:抖动调制量化水印算法相比于加性扩频水印算法在抵抗缩放、滤波攻击和JPEG压缩方面有着更好的鲁棒性能,但在抵抗噪声攻击方面不如其稳定,且鲁棒性较低。更多还原

【Abstract】 The paper described the basic principles of two kinds embedding algorithms of spread spectrum and quantization. They were respectively applied with additive spread spectrum algorithm and dither modulation(DM) quantization algorithm. The two algorithms were programmed by Matlab and experiments were designed to compare the robustness of the two embedding algorithms under block DCT transforms. The result shows that DM quantization digital watermark algorithm is more robust to scaling attacks、filtering attacks and JPEG compression, but less stable and robust to noise attacks than additive spread spectrum algorithm.更多还原