基于DCT域的两种盲水印算法的应用与比较

利用Arnold置乱理论以及混沌序列加密的方法对水印图像进行加密预处理,水印信息嵌入时,提出两种基于DCT变换域的数字水印算法。分别通过修改特定系数关系和中频系数替换的方法实现水印信息的嵌入。对两种水印算法的仿真实验结果进行比较与分析,得出两种水印算法在图像的不可见性方面都表现出良好的性能,在水印检测时,实现了完全盲提取;但在抵抗JPEG压缩、噪声、滤波等攻击方面基于中频系数替换的水印算法表现出更强的鲁棒性。

Application and Comparison of Two Blind Watermarking Algorithms Based on DCT Domain

Based on Arnold scrambling theory and chaos sequence encryption method to encrypt watermark image preprocessing,at the watermark embedding,two digital watermark algorithms are proposed based on DCT transform domain.The algorithm achieves the embedding of watermark by means of modifying the coefficients and the replacement of intermediate frequency coefficient.By comparison and analysis of two algorithms simulation experiment results,and draw the conclusion that both of the algorithms have good invisibility,do not require the participation of the original image,which is fully blind extraction;But the watermarking algorithm with the replacement of intermediate frequency coefficient in resisting some common image attacks such as JPEG compression,noise and filtering show a stronger robustness.