【作者】 刘良文；

【导师】 游步东； 徐铭政；

【作者基本信息】 南昌大学 ， 机械设计及理论， 2005， 硕士

【摘要】 在知识经济和信息社会的今天,数字水印技术正在从学术研究走向技术应用。然而数字水印技术的研究主要集中在图像、视频、音频等方面,工程图设计师的辛勤劳动和智慧结晶没有得到应有的重视。 本文阐述了数字水印技术体系,总结各种水印算法的特点;剖析计算机图形学中图形图像的异同;展示AutoCAD图形数据库的格式和二次开发技术的要点;从而实现二者的有机结合。文中实现了数字图像、数字签名分别作为水印嵌入到工程图中的算法。并对零水印和频率域水印算法在工程图中的应用适用性作出了有益的探索。 检测结果表明数字图像水印具有良好的可辩认性,对于少量的增加删除、均匀缩放、旋转、平移等常规攻击手段具有较强的健壮性。数字签名方案具有一定的创新,实现了数字水印技术健壮性和透明性的较好结合。这二种算法符合当前的数字水印体系的规范,存在某种程度上的实用价值。 文章从技术层面综述了数字水印技术在工程图中的应用的可操作性和实用价值,对今后课题的深入研究提出了建议。更多还原

【Abstract】 The digital watermarking technology has been walking out of the lab into the hall of application as the guardian of the intellectual property right. However the new high-tech focuses merely on the still image, A\V etc. ignorant of the protection of the mechanical drawings, which of course deserves anti-pirate as any other intellectual productions.This paper proposes 2 availabilities to meet this demand. In the first algorithm, a black-white image is embedded into a AutoCAD drawing based on the deep exploitation of the drawing formula and ingenious programming by means of ObjectARX together with the Visual C++. The second one instance the digital signature concept by employing a meaningful bit series to mix into the parameters of the mechanical drawing entities.These methods prove to be robust against the attacks such as translation, rotation, scaling, minor adding and deleting of drawing entities while being unobtrusive. These methods are compatible with the standard of the digital watermarking technology system on the building for its selection of watermark or its series.Besides, the paper analyzes the feasibility of other 2 algorithms, i.e. the so-called naught and the frequency-domain transformation digital watermarking technologies. To end the article, a suggestion to further study about the mixture of the watermark technique and the protection of mechanical drawings is put forward, hopefully helpful to those who bend on this obscure academic corner.更多还原