基于三重小波系数集的水印算法研究

本文提出了一种基于三重小波系数集的水印嵌入方法。定义了三重小波系数集，根据其元素间相互关系选择系数集并将其分成两类从而嵌入和提取水印。同时利用shuffle算法对水印序列进行置乱以提高系统的安全性。实验结果表明，该算法对原图像的影响极小，并且对于各种通用的图像操作和攻击具有极好的鲁棒性。

A WATERMARKING SCHEME BASED ON TRIPLET OF WAVELET COEFFICIENTS

A watermarking scheme based on triplet of wavelet coefficients is proposed.Triplets of wavelet coefficients are defined,then selected and classified into two classes to embed and extract the watermark according to the relationship of their three wavelet coefficients.The shuffle algorithm is also adopted to randomize the watermark sequence for the purpose of security.Experimental results show that the degradation caused by the proposed algorithm is very trifle,and the watermarking scheme is very robust to common image processing and malicious attack.