基于混沌映射的小波域可读水印

提出了一种基于混沌映射的小波域公开水印算法,该算法中水印是一幅有意义的二值图像,水印嵌入前利用混沌序列进行混沌调制.在分析图像小波分解系数的树结构关系以及人眼视觉系统模型的基础上,在宿主图像的两棵小波系数树中嵌入一位水印信息,通过量化使它们呈现足够大的统计差别从而使水印检测时能提取水印信息,并且检测时不需要原始图像和原始水印。实验结果表明,此方法是一种行之有效的图像版权保护方法。

Wavelet Domain Readable Watermarking Based on Chaotic Mapping

A wavelet tree-quantization readable watermarking algorithm based on chaotic mapping and human visual system is proposed.In the algorithm,the watermark is a meaningful binary bitmap and is modulated by a chaotic sequence before embedding.By analyzing the tree structure relation of wavelet coefficients and the model of human visual system,each watermark bit is embedded using two wavelet trees of host image,The trees are so quantized that they exhibit a large enough statistical difference which will later be used for watermark extraction and the watermarking detection needs no host image and original watermark.Experiment results show that the watermarking is invisible,and robust to several kinds of attack.