基于小波变换和混沌系统的数字视频水印研究

Study on Digital Video Watermark Based on Wavelet Transform and Chaos

提出了一种基于小波变换和混沌系统的三维DWT自适应数字视频水印模型.该模型首先对动态图像分块定义,从中选取合适的三维块和二维块分别进行小波变换后作为水印嵌入载体,然后将多分辨率水印采用自适应的方式嵌入到动态图像中.多分辨率自适应嵌入方式和混沌系统的初值敏感性保证了嵌入水印的鲁棒性和安全性.

A novel self-adaptive digital video watermarking model of three - dimensinal DWT based on wavelet transform and chaos is proposed in this paper. The authors firstly define the block of the dynamic image. Then we choose some appropriated three - dimensional and planar blocks to do transform by wavelet, and consider them as a watermark carrier of original image. Finally, the multiresolution watermark is embedded into the dynamic image in self-adaptive method. The self-adaptive multiresolution embedded mode and the chaotic system sensivivity of initial value ensure watermark＇s security and robustness.