一种带纠错编码的小波域自适应盲水印算法  

A Wavelet Domain Adaptive Blind Watermarking Algorithm with Error Correcting Encoding

作　　者：刘会英[1] 张政保[1] 文家福[1] 李占德[1] 

机构地区：[1]军械工程学院计算机工程系,河北石家庄050003

出　　处：《计算机技术与发展》2010年第3期140-142,146,共4页Computer Technology and Development

基　　金：河北省科技厅基金资助项目(05213579)

摘　　要：文中提出了一种小波域自适应盲水印算法。该算法具有如下特点:(1)以图像局部相关特性为基础,采用块均值量化策略;(2)以人眼视觉掩蔽特性为基础,将小波系数块进行分类,不同类的块选取不同的量化步长,并且水印嵌入过程中块内系数的改变量自适应于系数本身大小;(3)利用纠错编码和混沌置乱对水印信息进行调制,以提高水印的鲁棒性。该算法在检测时不需要原始图像,实现了盲检测。实验结果表明,该方案能很好地抵抗JPEG压缩,叠加噪声,裁剪等攻击,具有良好的鲁棒性和透明性。A novel adaptive digital image watermarking algorithm in wavelet domain is proposed. The features of this algorithm are as follows： （ 1 ）Block quantization strategy based on local image characteristic is adopted. （2）Block in low- frequency band is classified into several classes based on human visual system. Different kind of block select different quantization step. During the embedding process, the change of coefficient in each block is adaptive to the absolute value of the coefficient itself. （3）In order to improve robustness of the water- mark, error correction coding and chaos scrambling are adopted to modulate the watermark. The watermark can he detected without resorting to the original host image. Experiment results show that this scheme is proved of high invisibility and robustness.

关 键 词：块均值量化 小波变换 纠错编码 混沌置乱 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]