粒子群算法优化离散余弦变换的数字水印

Digital watermarking based on discrete cosine transform optimizing by particle swarm optimization algorithm

为了获得更加理想的数字水印效果,提高数字载体的安全性,针对当前数字水印算法的一些缺陷,提出了粒子群算法优化离散余弦变换的数字水印技术。首先对水印图像进行置乱处理,并采用离散余弦变换对数字载体进行分解,然后将水印信息嵌入到离散余弦变换域的各系数中,其中水印信息的嵌入强度采用粒子群优化算法决定,最后采用仿真实验测试算法的性能。实验结果表明,相对于其它数字水印算法,本文水印算法不仅可以很好的满足水印不可感知性,而且增强了抵抗各种攻击的鲁棒性。

In order to obtain more ideal watermarking effect and improve the security of digital media,aiming at defects of current digital watermarking algorithms,a digital watermarking algorithm is proposed based on discrete cosine transform optimizing by particle swarm optimization algorithm. Firstly,watermark image is scrambled and the discrete cosine transform is used to decompose digital media,secondly,the watermark information is embedded into the coefficients in discrete cosine transform domain which the watermark embedding intensities are determined by using particle swarm optimization algorithm,lastly,the performance is test by simulation experiments. The experimental results show that compared with other digital watermarking algorithms,the proposed watermarking algorithm can not only meet the watermark imperceptibility,and have good robustness against various attacks.