摘要
从小波包域水印算法的现状出发,提出了一种小波包域的图像水印算法,采用较大灰度级图像作为水印,实现了一种小波包域灰度图像水印算法,该算法在水印类型和信息量方面是一个较大的突破,对比实验结果表明,在大多数鲁棒性能攻击测试中,与传统小波包域水印算法相比,该算法提取水印的归一化相关系数NC值更大,水印性能更优越。实验结果证明了算法的可行性。
One image watermarking algorithms based on WPT are proposed in this paper,for the insufficiency of watermark algorithms in wavelet packet domain.First,an algorithm based on larger gray-level image is proposed for the deficiency in abundant information of watermarks embedded in wavelet packet domain,namely a gray-level image watermark algorithm based on WPT is implemented.Compared with traditional watermark algorithms based on WPT,it is a great breakthrough in the kinds and amount of watermark information.Under most attack tests of robust performance,the comparison experiments show the greater normalized correlation coefficients of the watermarks extracted,which results in better performance.The experiment results prove the feasibility of this algorithm.
出处
《计算机安全》
2011年第4期21-24,共4页
Network & Computer Security
基金
国家教育部重点科学技术项目(204143)
甘肃省科技攻关项目(2GS035-A052-011)
