基于小波变换的矢量地理空间数据数字水印算法

基于矢量地理空间数据自身特点,运用小波变换技术,提出了一种基于小波变换的矢量地理空间数据数字水印算法。即对一系列的线、面坐标串分别进行离散小波分解,把水印信息分段嵌入到相应的小波分解后得到的低频系数中;再进行小波逆变换得到含水印信息的矢量地理空间数据。在水印信息提取过程中,解决了删点、投影变换等对水印信息提取的不利影响。实验分析表明,该算法在抗矢量地理空间数据处理中常见的噪声攻击、坐标数据轻微的移动等方面具有较好的效果。

Watermarking Algorithm for Vector Geo-spatial Dataon Wavelet Transformation

This paper presented a new watermarking approach for the digital vector geo-data based on wavelet transformation.By the proposed algorithm,the line and surface coordinate points were decomposed by wavelet transformation firstly,then watermarking was embedded in the low frequency coefficients of wavelet transformation,and the vector geo-data with watermarking was obtained by inverse wavelet transformation finally.The experiments showed that the proposed algorithm could effectively resist the attack of noise,removing points,adding points,deleting points and so on.