基于模运算的二维数字水印标记的算法分析

Analyses of Two-Dimension Watermarking System Based on Modular Arithmetic

数字水印算法首先将二维水印标记按某一规则打乱其原始顺序,并将其转换为相应的二进制序列.然后对原图像进行分块DCT变换,并以算术模运算为基础将二进制水印信息嵌入DCT块中.水印标记的重复嵌入能够加强该算法的抗裁剪能力.通过实验可以证明,该算法具有很好的透明性,并对于噪声、JPEG有损压缩等操作具有较好的鲁棒性.

A blind detection digital watermarking system is analyzed in this paper. First the system changes the watermark into a bit sequence, and then embeds the bits into the block--DCT of the image based on modular arithmetic. For better resistance to cropping, the converted bit sequence is repeatedly embedded. The experiment results demonstrate that the proposed watermarking system is transparent from human visual perception and is robust against noise and compression.