伪3D-DCT域的视频零水印算法

Video zero-watermarking algorithm in pseudo 3D-DCT domain

为了更好地平衡水印的不可见性和鲁棒性,本文提出了一种伪3D-DCT域的视频零水印算法。首先用到了关键帧提取技术,用欧式距离法提取测试视频中的关键帧,接着通过帧间差分法获取得到关键帧的运动目标形心块,然后对分块后的关键帧图像的运动目标形心块进行伪3D-DCT变换,最后通过变换后得到的AC系数构造的关键帧特征值序列与加密后的水印序列异或操作生成零水印。实验表明,该算法能够很好地抵抗高斯噪声、椒盐噪声、几何攻击和滤波攻击,很好地处理了水印的不可见性和鲁棒性之间的矛盾。

In order to balance the invisibility and robustness of the watermark better,a video zero-watermarking algorithm in pseudo 3 D-DCT domain is proposed in this paper.Firstly, the key frame extraction technology is used,use the Euclidean distance method to extract the key frames in the test video,obtain the moving target centroid block of the key frame by the inter-frame difference method,then perform a pseudo 3 D-DCT transform on the moving target centroid of the key frame image after the block,finally, the key frame feature value sequence constructed by the AC coefficient obtained by the transformation and the encrypted watermark sequence are XORed to generate a zero watermark.Experiments show that the algorithm is well resistant to Gaussian noise, salt and pepper noise, geometric attacks and filtering attacks,the contradiction between the invisibility and robustness of the watermark is well handled.