基于混沌、HVS和小波变换的自适应数字水印算法  

Adaptive image watermarking algorithm based on chaos,HVS and wavelet transform

作　　者：周万府[1] 林加华[1] 薛文格[1] 姜华[1] 

机构地区：[1]楚雄师范学院计算机科学系,云南楚雄675000

出　　处：《现代电子技术》2013年第14期76-78,共3页Modern Electronics Technique

基　　金：楚雄师院学院院级一般资助项目(10YJYB04)

摘　　要：为了提高常规小波域水印算法的自适应性,在此提出了一种在小波域嵌入数字水印的新算法。首先,对载体图像进行一层小波分解;然后,对具有较大纹理强度的中频子带进行二层小波分解,并选取二层中频子带HL1作为嵌入区域;最后,计算嵌入区域中每一点的亮度差异值,并根据HVS原理将混沌置乱后的二值水印信息自适应的嵌入到具有较大亮度差异的位置上。经仿真实验表明,该算法具有很好的不可见性,且对JPEG压缩、加噪、滤波等常见的图像攻击具有很强的鲁棒性。In order to improve the self-adaptability of normal digital watermarking algorithm in discrete wavelet transform （DWT） domain, a novel algorithm of embedding digital watermark into wavelet transform domain is proposed in this paper. The first-level wavelet decomposition for a carrier image is executed first, and then the second-level wavelet decomposition for the middle frequency sub-band with high texture strength and the second-level middle frequency sub-band HL1 is selected as an em- bedding area. Finally, brightness difference of each point in the embedding area is calculated, and according to HVS principle, the binary watermark information with logistic chaos scramble is self-adaptively embedded into the location with high brightness difference. Simulation results prove this algorithm has a good invisibility and robustness against attacks such as JPEG compres-sion, adding noise, filtering and other image manipulations.

关 键 词：数字水印 混沌 人类视觉系统 离散小波变换 自适应算法 

分 类 号：TN964-34[电子电信—信号与信息处理]