【摘要】 提出了一种基于DCT变换的三维运动盲水印算法，算法结合了扩展频谱和量化的思想，通过对DCT域中频系数进行适当量化扰动来嵌入水印信息。选择合理的量化步长能保证对原运动信号不产生明显的视觉破坏；同时通过扩展频谱，让每一位水印信息包含在多个频率系数中，能有效增加抗攻击能力。实验表明，该算法对高斯白噪声、重采样、运动光滑以及重排列等有较好的鲁棒性。更多还原

【Abstract】 This paper proposes a DCT-based blind watermarking algorithm for 3D motion. It adoptes two well-known ideas called spread spectrum and quantization. The authors embed a watermark into the 3D motion signals by perturbing the middle frequency coefficients. By choosing an appropriate quantized step-length, the distortion is kept unnoticeable; and by spectrum spreading, every watermark bit is embedded in more than one frequency coefficient, this can effectively increase the robustness. Experimental results show that the method is resilience to many attacks such as Gaussian white noise,resampling,smoothing and rearranging.更多还原