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基于坐标映射的矢量地理数据全盲水印算法

杨成松,朱长青,陶大欣(信息工程大学测绘学院, 郑州 450052;南京师范大学虚拟地理环境教育部重点实验室, 南京 210097)

摘 要
通过对全盲水印特点的分析,提出了将文字按照字符编码方式直接转化为二进制位的水印信息生成方式。基于矢量地理数据的空间定位特性,研究了水印嵌入与提取中坐标映射机制和映射函数构造原则。利用提出的水印生成和坐标映射方法,建立了一种矢量地理空间数据全盲水印算法。实验结果表明,提出的算法能抵抗矢量数据中常见的数据压缩、增点、删点、编辑、裁剪以及平移等攻击,具有很好的鲁棒性。
关键词
A Blind Watermarking Algorithm for Vector Geo-spatial Data Based on Coordinate Mapping

YANG Chengsong,YANG Chengsong,TAO Daxin(Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052;Key Laboratory of Virtual Geographic Environment of Ministry of Education, Nanjing Normal University, Nanjing 210097)

Abstract
By the analysis of the properties of blind watermarking, a method for generating watermark information which transforms characters directly into binary code is proposed. Secondly, the mechanism of coordinate mapping and the principles of constructing mapping function for watermarking embedding and extracting are studied based on the location characteristic of vector geo-spatial data. Then, a blind watermarking algorithm for vector geo-spatial data is obtained using the proposed approaches of generating watermark information and coordinate mapping. The experiments conducted in this paper show that the algorithm is with good robust and can resist some usual attacks such as data compressing, adding, deleting, editing, clipping, translating and so on.
Keywords
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