中文摘要：

可逆水印技术能够在精确提取水印信息的同时,完全无损恢复原始载体数据,更适用于矢量地图版权保护。提出一种基于空间特征的二维矢量地图可逆水印算法。该算法在保持矢量地图特征点相对位置的前提下,根据密钥对特征点位置进行非线性置乱,避免非授权用户对矢量地图高精度数据的使用,并在置乱后的特征点中嵌入水印信息,能够在提取水印信息的同时无损恢复原始矢量数据。实验结果表明该水印方案严格可逆,具有较好的隐蔽性。

英文摘要：

The technique of reversible watermarking can strictly recover the original cover data,with the watermark accurately extracted at the same time.Therefore it is more suitable for digital copyright protection of vector maps.A new space feature-based reversible watermarking for 2D-vector maps is proposed.Under the condition of keeping relative locations of feature points,this algorithm nonlinearly scrambles the location of feature points according to the predefined secret key to avoid unauthorized users using high-accuracy vector data.Then it embeds watermark into the scrambled feature points and can recover the original 2D-vector maps with the watermark extracted at the same time.The experimental results show that the proposed watermarking method is strictly reversible with preferable invisibility.