摘要
基于分块模运算的数字图像水印算法通过在图像特征边缘点附近选择n×n像素点所组成的子块,并调整该块的平均亮度对于一个正整数2p取模的值来嵌入水印。分块大小n以及模数2p对于水印的不可感知性及稳健性具有重要影响。文章基于理论分析和实验验证研究了采用不同参数嵌入水印对于算法性能的影响,并对算法的安全性进行了简要讨论。其结论将有助于该类算法的实际应用。
The block-oriented and modular-arithmetic-based digital image watermarking embeds watermark by selecting n×n neighboring pixels around the edges of the features and adjusting the mean intensities values of the selected blocks modulo 2p.The block size n and the modulus 2p strongly influence the imperceptibility and robustness of the embedded watermark.The performance of the watermarking scheme is studied with theoretic analysis and experimental verification using different parameters for watermarking embedding.The security of the algorithm is also briefly discussed.The results will benefit the applications of such type of watermarking scheme.
出处
《计算机工程与应用》
CSCD
北大核心
2005年第1期11-13,131,共4页
Computer Engineering and Applications
基金
国家自然科学基金(编号:60271019
70371030)
教育部博士点基金(编号:20020611007)
图像信息处理与智能控制教育部重点实验室开放基金(编号:TKLJ0301)
关键词
图像
数字水印
性能分析
image,digital watermarking,performance analysis
