基于差值映射的二维电子海图自适应水印

Research of adaptive watermarking for 2D electronic charts based on difference mapping

研究了二维电子海图的数字水印技术。针对二维电子海图地物信息多样,隐藏信息的嵌入选择结点有限,常规的水印嵌入方法很难获得较理想的水印容量和确保海图地理精度在可容许的范围内变动,提出了一种二维电子海图自适应水印方法,该方法利用基于平移不变的离散小波域求解策略,获得一个地图域空间内较为理想的一个水印嵌入载体集合。实验和研究表明,该方法具有很好的鲁棒性,同类似方法相比,能够适应海图常规操作所带来的数据扰动,在适应剪切、旋转以及噪声攻击方面具有较低的误码率。

Digital watermarking for two-dimensional electronic charts was studied. To solve the problem that a two-dimen- sional electronic chart has varieties of terrestrial object information, and the vertexes in the map can carry very lim- ited watermarks, so it is very difficult for a conventional watermarking method to obtain the ideal watermark capaci- ty and to make the geographic accuracy of the electronic chart tolerated within certain limits, an adaptive water- marking method based on difference mapping for 2D electronic charts was presented. It takes advantage of the sol- ving strategy based on the shift invariant discrete wavelet domain to obtain the ideal watermark embedding carrier set in the map space. The experimental results show that the proposed method has the good robustness, and com- pared with similar methods, is adaptable to the data perturbation caused by conventional chart operation, with the lower bit error rate in cutting, ratating and noise attack.