基于小波变换的栅格数字地图水印算法  

Watermarking algorithm for digital grid map based on wavelet transformation

作　　者：符浩军[1,2] 朱长青[1,3] 徐惠宁 

机构地区：[1]信息工程大学测绘学院,郑州450052 [2]总参测绘信息技术总站,西安710054 [3]南京师范大学虚拟地理环境教育部重点实验室,南京210046

出　　处：《测绘科学》2009年第3期107-108,91,共3页Science of Surveying and Mapping

基　　金：国家863基金项目(NO:2006AA12Z223);武汉大学地理信息系统教育部重点实验室开放研究基金(No.wd200601)

摘　　要：本文提出了一种基于小波变换的栅格数字地图水印算法。算法基于栅格数字地图相比自然图像具有较高亮度,低频分量具有更高感觉容量的特点,在栅格数字地图经小波变换后的低频分量部分依据其亮度调节强度嵌入周期性扩展水印;同时为提高算法鲁棒性,在细节分量部分嵌入相同水印,水印嵌入位置根据人类视觉系统特性和小波系数间内在联系确定。实验分析表明,该算法能较好抵抗诸如JPEG压缩、锐化、剪裁等各种攻击,具有好的鲁棒性。This paper proposed a new watermarking algorithm for the digital grid map based on wavelet transformation. The features of digital grid map with higher luminance and greater sensual capability than natural image were utilized by the proposed algorithm, The watermark, which was disposed by period spread technique, was adaptively embedded into low frequency section according to the luminance; The same watermark was embedded into high frequency detail section to improve the robustness, When the watermark was embedded into high frequency detail section, the embedded places were determined by the characteristics of human visual systems and the intrinsic relations of wavelet coefficients. The experiments showed that the proposed algorithm was robust against various malicious attacks such as JPEG compression, sharpening, cutting etc.

关 键 词：栅格数字地图 数字水印 小波变换 鲁棒性 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]