摘要: 提出一种基于扩频机制的数字图像水印算法。用伪随机序列作为扩频码,对原始水印信息进行周期延拓扩频和加密,在考虑人眼视觉特性的基础上,确定扩频水印在平稳小波变换域的嵌入位置和强度,扩频序列的选取决定了所选用的小波变换域最大系数的个数以及水印的密钥序列。实验结果表明,该算法具有较强的鲁棒性。
关键词:
伪随机序列,
周期延拓,
平稳小波变换,
扩频水印
Abstract: This paper proposes a digital image watermark algorithm based on spread spectrum mechanism. It selects the pseudo random sequence modulation for the periodic sequence of continuation, and then encrypts. Taking into account the characteristics of human visual system, the positions and strengths of embedding into the original image which uses the same chip rate coefficients of the stationary wavelet transform domain are obtained. Selecting spread spectrum sequence determines the maximum coefficients of the wavelet transform domain and the key period sequence of watermark. Experimental results show that the algorithm has strong robustness.
Key words:
pseudo random sequence,
periodic sequence of continuation,
stationary wavelet transform,
spread spectrum watermark
中图分类号:
孙利杰, 赵景秀, 郑美珠, 高忠. 一种基于扩频机制的数字图像水印算法[J]. 计算机工程, 2011, 37(14): 120-122.
SUN Li-Jie, DIAO Jing-Xiu, ZHENG Mei-Zhu, GAO Zhong. Digital Image Watermark Algorithm Based on Spread Spectrum Mechanism[J]. Computer Engineering, 2011, 37(14): 120-122.