一种基于多层解析的MPEG-4二维网格动画水印技术

An Algorithm of MPEG-4 2D Mesh Animation Watermarking Based on Multiresolution Analysis

提出了一种针对MPEG 4二维网格动画的强健数字水印系统的实现方法:首先利用多层解析分析将二维网格动画中的运动特征提取出来,再以扩频技术将水印信息分散到这些运动特征中,同时利用空间平面校正技术来解决几何转换所造成的网格位置偏移问题。使用了仿射变换攻击、平滑化攻击、强化及衰减攻击、随机噪声攻击以及混合性攻击来测试生成的水印系统。实验结果显示该水印系统实现方法能有效地抵抗上述攻击。

This paper proposes a robust watermarking technique for MPEG-4 2D mesh animation. A multiresolution analysis is applied to locate feature motions of the animated mesh. The watermark signal is inserted based on a spread-spectrum approach by perturbing the extracted feature motions. A spatial-domain registration technique has also been incorporated to restore geometrically transformed mesh data. A variety of attacks, including the affine transformation, smoothing, enhancement and attenuation, random noise, and combination of the above, are used to verify the robustness of the proposed system. Experimental results show that the watermarks can withstand the mentioned attacks.