基于多规则小波变换的视频水印加密算法研究

Video Watermark Encryption Algorithms Based on Rules Wavelet Transformation

通过对视频嵌入水印的安全性和鲁棒性的分析,采用了一种基于多规则小波变换的视频水印嵌入与提取算法。该算法首先对水印图像进行置乱加密增强其安全性,其次对视频帧和水印图像分别进行多层小波变换,最后根据不同的小波系数进行多规则水印嵌入。算法不仅充分利用了小波变换的多分辨特性,而且兼顾了水印的不可感知性和视频帧的鲁棒性。实验结果表明,该算法对高斯噪声、几何失真和压缩等具有良好的安全性和鲁棒性。

The security and robustness of watermark embedded in video are analyzed in this paper, and the algorithm of the video watermark embedding and extracting based on multi-rules wavelet transform is adopted. Firstly, the watermark image is scrambled to enhance its safety. Secondly, the video frames and the watermark image are separately transformed by multilayer wavelet. Finally,the watermark is embedded according to the different coeffi- cient rules. The characteristics of the wavelet transformation are fully used, and the security of watermark and the video frames robustness are considered. The experimental results show that the algorithm has a good safety and robustness for Gaussian noise, geometry distortion and compressing.