面向局部无比例形变工程CAD图内容完整性认证的数字水印技术研究

项目名称： 面向局部无比例形变工程CAD图内容完整性认证的数字水印技术研究

项目编号： No.61300160

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 自动化技术、计算机技术

项目作者： 苏智勇

作者单位： 南京理工大学

项目金额： 23万元

中文摘要： 本项目研究利用数字水印技术解决局部无比例形变工程CAD图拓扑和几何信息的完整性认证问题。随着协同设计技术在工程CAD领域的广泛应用，工程CAD图在实际应用中面临着被恶意窃取、篡改和破坏等问题。数字水印技术作为一种有效的内容完整性认证手段，被广泛应用于二维CAD图领域。但是，现有二维CAD图数字水印技术缺乏工程CAD图拓扑信息完整性认证问题的针对性研究；且无法有效抵抗针对工程CAD图局部对象的合法无比例形变攻击。本项目拟在工程CAD图的不变特征挖掘和提取技术研究的基础上，开展抵抗局部无比例形变攻击的拓扑和几何信息半脆弱数字水印设计方法的研究；通过突破工程CAD图信号稀疏表示、线性测量和信号重构等关键科学问题，降低嵌入的水印信息量并实现对篡改位置的精确定位，提高水印算法的安全性。本项目的研究将较好解决工程CAD图拓扑和几何信息的完整性认证问题，同时该技术也可应用于其他数字媒体的内容完整性认证。

中文关键词： 工程CAD图；内容认证；完整性认证；哈希；数字水印

英文摘要： We target to address the problem of topological and geometrical information authentication and verification of engineering CAD drawings with local disproportional transformation. The ease of duplication and modification of engineering CAD drawings calls for the development of techniques for integrity authentication with the widely use of collaborative design technology in Engineering CAD. Digital watermarking technology is widely used in the CAD field as an effective means of integrity authentication.There are some limitations of existing studies when applied to the proposed problem: first, topology authentication is still in its infancy and offers interesting potential for improvement; second, existing shcemes are sensitive to local non-proportional transformations. Based on the research of the techniquce of mining and extracting the invariance feature of engineering CAD drawings, we propose the research on semi-fragile watermarking technology for topological and geometrical information authentication. The capcity is reduced based on compressed sensing, which includes sparse representation, measurement and reconstruction. This results in the improvement of the watermark imperceptibility and tamper localization ability. The study of this project can well solve the problem of topological and geometrical informati

英文关键词： engineering CAD drawing；content authentication；integrity authentication；hash；digital watermarking