基于小波变换的CDMA图像盲水印算法

提出了一种盲扩展谱水印算法,将水印信息重复的嵌入到图像多层小波分解的系数中.通过对数字图像小波变换结构的研究和分析,利用扩展谱将信息嵌入到LH和HL子带,结合噪声视觉函数在水印的透明性和鲁棒性之间实现了较好的平衡,提高了信息隐藏的安全性,并运用CDMA(Code Division Multiple Access)理论实现了水印信息的盲提取.大量的试验结果表明,该算法对于常见的图像处理操作,特别是对于JPEG压缩和多种噪声攻击有较好的鲁棒性.

A BLIND WATERMARKING ALGORITHM FOR CDMA IMAGE BASED ON WAVELET TRANSFORM

The paper proposes a blind spread spectrum watermarking algorithm where watermark information is embedded repeatedly into multilevel wavelet decomposition coefficients of the cover image.By studying and analyzing the structure of wavelet transform of digital image,data embedded in LH and HL subbands through better spectrum spreading provides a good tradeoff between the transparency and the robustness of watermarks in unification with Noise Visibility Function,and increases data hiding security.It is a blind...