【摘要】 文章简要回顾了水印技术的发展,利用DFT变换的可加性和图象去噪原理提出了一种基于频域的三维运动盲水印算法。该算法通过对DFT域中频系数进行适当扰动来嵌入水印信息,在提取水印时,首先利用图象去噪原理对待检测信号进行光滑,得到原始信号的一个估计,其次得到含有水印信息的噪声,最后放大该噪声,将水印弱信号变成较强信号,从而有利于提取水印。实验表明,该算法对高斯白噪声、重采样、运动光滑、裁剪、信号增强、信号减弱以及重排列等有较好的鲁棒性。更多还原

【Abstract】 This paper briefly reviews the development of digital watermarking,and proposes a DFT based blind watermarking scheme for 3D motion.The algorithm embeds a watermark into the 3D motion signals by perturbing the middle frequency coefficients of DFT domain.First,the detected signal is smoothed to get an approximation to original signal,using the theory of noise eliminating.Secondly the watermark noise is obtained by minus operation.Finally,the watermark noise is amplified in order to extract.Experimental results show that the method is resilience to many attacks such as Gaussian White Noise,resampling,smoothing,cropping,enhancement,attenuation and rearranging.更多还原