基于容量估计的数字水印算法

为达到更好的鲁棒性和置信度,水印的嵌入应当基于容量估计.本文提出了两种基于容量估计的DCT域数字水印算法,首先利用人眼视觉特性确定水印强度,并在此强度下进行容量估计,以确定实际用于嵌入的DCT系数.它们能够满足高鲁棒性,低失真和动态调整嵌入容量的要求,具有良好的性能,可以用于数据或者图像水印的嵌入.在此基础上,本文还提出了一种将水印与JPEG相结合的嵌入和压缩算法,实验证明它能够同时满足压缩和水印嵌入的要求.

A Capacity Estimation Based Watermarking Algorithm

In order to be more robust and with higher fidelity,watermarking should be based on capacity estimation.In this paper,two capacity estimation based watermarking algorithms are proposed.First HVS are used to decide the embedding strength,and then these strength are used for capacity estimation to decide which coefficient are used to embed information bit.The algorithms can achieve high robustness,low distortion and dynamical adjustment of embedding capacity,and can be used for binary or image watermarking.A method combining watermarking and JPEG compression is also proposed here,and shows good performance for both requirements.