基于小波包分解的版权保护算法

Watermarking algorithm for copyright protection based on wavelet packet decomposition

提出一个基于小波包分解的数字图像版权保护算法。利用小波系数的特征对宿主图像进行预处理,并选择其中具有相似纹理特征的图像子块进行组合构成相应的子图像。基于块处理与像素调制相结合的空频域联合的水印算法,在纹理活动区域采用小波包变换的系数量化方法嵌入水印,不仅保证了在不损失图像质量的条件下大容量鲁棒信息的隐藏,也保证了水印的盲提取,从而有效地增加了鲁棒水印信息的嵌入量及抗攻击能力。实验结果表明该算法较传统方法而言达到了鲁棒性与容量的最佳结合。

A novel technique for digital image copyright protection based on wavelet packet decomposition is presented. The method is a new algorithm that it first utilizes the characteristics of coefficients of the wavelet transformation to preprocess the host image and selects the un-overlapped sub-blocks that have same texture features to recompose the corresponding sub-images. In the embedding stage, the way of using quantization modulation to hide watermarks in the wavelet packets coefficients decreases the influence on the fidelity of the host image. The experimental result shows excellent performance on both robustness and transparency.