一种小波域自适应鲁棒闭环数字盲水印技术

本文提出了一种基于小波域的闭环自适应图像鲁棒数字盲水印技术.水印的嵌入过程是一个闭环过程,且其嵌入的位置及强度均与原始图像有关.水印嵌入的初始强度由小波域图像压缩的量化因子决定,并根据检测要求不断的进行调整,从而达到水印的最佳嵌入.本文证明了这种闭环系统的收敛性,并且给出了水印检测过程中正确检测概率和虚警检测概率的求解公式,可用于闭环系统的检测性能判决条件.水印的检测过程中不需要任何原始图像和原始水印信号的信息,采用独立分量分析实现对水印信号的盲检测.检测过程中不仅可以检测到水印的存在,而且可以提取出嵌入到图像中的多个水印信号.实验结果证实了本文提出的闭环自适应数字盲水印技术优于传统的自适应水印技术,水印检测过程中在不需要考虑水印图像所经历的攻击类型及攻击参数的情况下可以正确的提取水印信号.本文提出的水印算法对通用水印测试软件Stirmark具有很好的鲁棒性.

A New Adaptive Closed Loop Robust Blind Image Digital Watermarking in Wavelet Domain

A new adaptive closed loop robust blind image digital watermarking technique in wavelet domain is proposed.The embedding process is modified according to the results of the performance analysis of watermarking.If the watermark can not meet the requirements or the embedded watermark renders visual artifact,the embedded intensity of watermark is modified so as to obtain the optimal embedding effect.The convergence of the closed loop techniques is proved.The probabilities of false alarm and detection are also given which are used as the performance measures of the closed loop system.The watermark detection process adlopt independent component analysis and do not need any information about original image and original watermark and can extract not merely detect the perfect watermarks embedded.Experimental results show that this adaptive closed loop robust blind watermarking performs better than the traditional adaptive watermarking.The method proposed in this paper has a good robustness to the popular watermark test software Stirmark.