NURBS曲面模型鲁棒数字水印嵌入算法

随着计算机多媒体技术的快速发展，如何保护数字产品不被复制、盗用、篡改已成为信息安全领域中亟待解决的问题，数字水印技术成为解决该问题的一种新方法。该文基于非均匀有理B样条（NURBS）节点插入方法和扩频通信技术提出了NURBS曲面模型鲁棒水印嵌入算法，该算法嵌入的水印信息具有不可见性，能够抵抗节点插入、节点删除、节点细化、次数提升和仿射变换（平移、旋转、缩放）等NURBS模型常见攻击。仿真实验验证了算法的有效性。

Robust Digital Watermark Algorithm for NURBS Models

With the rapid development of computer multimedia,how to protect digital products from being copied,pirated and juggled has been an urgent problem in the information security field.Digital watermark is a new method to solve the referred problems.This paper proposes a robust watermarking algorithm for Non-Uniform Rational B-Spline(NURBS) surfaces based on knot insertion for NURBS and spread-spectrum communication technique.The embedded watermark is invisible and withstands the common attacks such as knot insertion/removal,knot refinement,degree elevation and affine transforms(translation,rotation and scaling).The validity of proposed algorithm has been confirmed with experiments.