一种基于Geometry Image的鲁棒三维水印  

Robust 3D Watermarking Based on Geometry Image

作　　者：王颖[1] 郑雪峰[1] 刘海燕[1] 

机构地区：[1]北京科技大学信息工程学院,北京100083

出　　处：《系统仿真学报》2010年第6期1450-1453,共4页Journal of System Simulation

基　　金：内蒙古自然科学基金(200711020819)

摘　　要：近年来三维水印作为保护三维模型版权的一类方法被提出并发展起来。通常使用的不规则三角网格的表示形式限制了信号处理方法在三维模型上的应用,阻碍了三维水印的发展。作者充分利用GeometryImage这种新的三维模型表示方法的特性,将三维模型转换为二维彩色图像,然后在其DCT变换域下嵌入水印。水印的提取过程通过将嵌入水印的模型与原始模型配准后进行顶点映射获得相应的二维图像,继而在DCT变换域下提取水印。实验结果证明所提三维水印算法能够有效抗击仿射变换、加噪、平滑、重采样、剪裁等多种攻击手段,是一种鲁棒的非盲三维水印算法。3D watermarking methods have been proposed as means to protect their copyright of 3D models. Commonly used irregular triangle mesh model limits the application of signal processing on 3D models, hence blocks the development of 3D watermarking techniques. A novel non-blind 3D watermarking method was proposed based on Geometry Image, which is a regular 2D grid representation of 3D models. During embedding, a 3D model was first transformed into a 2D geometry image, and then embedded with watermarks in the DCT domain; during extracting, the watermarked 3D model was aligned with the raw model, and its corresponding geometry image was obtained by vertex projection before embedded watermarks were extracted. Experimental results show that the proposed method is a robust 3D watermarking algorithm that is able to resist attacks such as affine transformation, noise addition, smoothing, remeshing, and cropping.

关 键 词：三维水印 GeometryImage 鲁棒 彩色图像 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]