基于Turbo码的DWT-DCT域稳健性视频水印算法

摘要

提出了一种基于Turbo码的DWT域与离散DCT域相结合的视频水印算法.在该算法中,首先选取视频序列中的关键帧,并对其亮度分量进行一级DWT变换,再对DWT域的逼近子带进行4×4的DCT变换,最后在DCT变换的直流系数中嵌入经过伪随机排序和Turbo码编码置乱后的水印信息.实验结果表明:该算法不仅具有良好的不可见性,而且对各种常见的攻击都具有较好的稳健性.%A video watermarking algorithm based on Turbo codes in the DWT-DCT domain is proposed.Firstly,the luminance component of the key frames is decomposed by a DWT transform.Then the approximation sub-band in DWT domain is decomposed by 4 ×4 DCT transform.Finally,the watermark information which is sorted by the pseudo-random and encoded by Turbo codes is embedded into the DCT domain.The experimental results demonstrated that the algorithm not only has invisibility,but also has better robustness to a variety of common attacks.