基于特征多分辨率层次表征图的三维CAD产品模型数字水印版权保护关键技术研究

项目名称： 基于特征多分辨率层次表征图的三维CAD产品模型数字水印版权保护关键技术研究

项目编号： No.61202197

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 计算机科学学科

项目作者： 冯小青

作者单位： 浙江财经学院

项目金额： 25万元

中文摘要： 三维CAD产品模型不但含有丰富的语义信息，而且具有多层次性的特点，而其知识产权保护既要能支持多细节粒度的全局模型，又要能支持局部的功能热点区域，而传统的三维模型数字水印主要侧重于满足水印模型的几何透明性要求和单一细节粒度的模型保护，很难满足三维CAD产品模型的多层次版权保护需求。本项目根据三维CAD产品模型的特性，引入特征多分辨率层次表征图，解决产品模型的多细节粒度表示和热点功能区域提取的问题；并在该表征图基础上，提出抵抗不同细节粒度攻击的多层次鲁棒性分形水印技术和面向局部功能热点区域的具有功能透明性的数字水印方法,解决CAD产品模型的多层次版权保护需求；并建立数字水印的评估、攻击和检测机制。基于理论研究成果，构建原型系统进行应用验证。本项目基于应用需求，为解决三维CAD产品模型版权保护问题提供了一条新路径，并将丰富和完善计算机辅助设计(CAD)与信息隐藏等理论,促进学科交叉形成自身特色。

中文关键词： CAD；特征多分辨率；功能透明性水印；量化索引水印；OBBTree

英文摘要： 3D CAD product model not only possess abundant semantic information but also has characteristics of multi-levels. The protection targets of its Intellectual Property are to support both a multiple levels of detail global model and partial function hotspot regions. Typical watermark techniques of 3D model only focus on meeting invisibility of geometry and protecting a single granularity model, which is difficult to meet the requirement of multi-levels copyright protection of 3D CAD product model. In this project, in order to solve problems of representation of multiple levels of detail granularity and extracting local function hotspot regions, hierarchical graph of feature multi-resolution is firstly introduced. And then, multi-levels robust fractal watermark against attacks of multiple levels of detail and function transparency watermark of local function hotspot regions are researched to solve requirements of multi-levels copyright protection. At last, watermarking mechanisms of assessment, attacks and detection for 3D CAD product model are established. On the basis of theoretical research mentioned above, a prototype system of watermark for 3D CAD product model is developed to verify the validity of algorithms. Our project provides a new idea for resolving practice requirement of copyright protection of 3D CAD

英文关键词： CAD；feature multi-resolution；function transparency watermark；Quantization index modulation watermark watermark；OBBTree