基于Contourlet域伪3D-DCT变换的视频水印

Video watermarking based on pseudo-3D-DCT in Contourlet domain

提出了一种新颖的Contourlet域伪3D-DCT变换的视频水印算法,Contourlet变换采用方向滤波器组,能有效捕获自然图像的边缘轮廓信息。本算法首先对原始视频的每帧图像进行Contourlet变换,取其变换后的低频图像,然后对低频图像进行分组,每一组分别进行伪3D-DCT,最后在变换后的直流系数中嵌入经过Arnold变换置乱后的水印,提取算法简单并实现了水印的盲提取,实验结果表明,本算法在保证不可见性的前提下显著提高了嵌入水印的鲁棒性,能够有效地抵抗MPEG压缩及其他常见的攻击。

A new video watermarking algorithm based on Pseudo-3D-DCT in Contourlet domain is proposed in this paper.Contourlet transform uses directional filter banks and captures more edges and contours in natural images.Firstly,Each frame mage of the original video is decomposed by Contourlet transform.Then,the lowpass images of Contourlet transform are divided into groups and Pseudo-3D-DCT is performed on each group.Finally,watermarking scrambled by Arnold transform is embedded into DC coefficients.The extraction algorithm is simple and blindly.The experimental results show that the proposed algorithm can greatly improve the robustness of the embedded watermark on the premise of invisibility and it is robust to MPEG compression and other common video processing.