小波和余弦变换的抗几何攻击数字水印算法

数字水印技术是目前保护信息安全和版权的一种有效方法,被广泛地用于数字媒体版权的保护中。本文提出一种基于离散小波变换(DWT)和离散余弦变换(DCT)的抗几何攻击数字水印算法,算法简单且易于实现,并具有较好的安全性、鲁棒性和不可见性。仿真结果证明该算法的有效性及抗JPEG压缩、滤波、剪切和噪声干扰能力,在版权保护方面具有一定的应用价值。

A kind of Algorithm of Digital Watermarking Counteracting Geometric Attacks Based on Discrete Wavelet and Cosine Transform

The digital watermarking technology is the method of protecting the information security and copyright at present,which has been widely used in the digital media copyright in the protection.A digital watermarking algorithm counteracting geometric attacks based on discrete cosine transform（DCT） and discrete wavelet transform（DWT） is proposed in this paper.The algorithm is simple and easy to comply,it also has good security property,robustness and invisibility.The simulation results demonstrate that the algorithm is valid and can resist the attacks of JPEG compression,pass filter,cropping and noise addition.It has some practical value on copyright protection.