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 基于常函数对于某些变换具有的不可变性,对抗几何变换的矢量地理数据水印算法进行研究。首先,对常函数的概念及其特征进行阐述,并推证一个抗旋转、平移和放缩攻击的常函数;然后,基于建立的常函数,通过把水印信息嵌入到几何不变量中,提出一种抗几何变换的矢量地理数据水印算法;最后,对提出的水印算法的鲁棒性进行试验分析。试验结果表明,提出的算法能抵抗压缩、增点、删点、裁剪、平移、旋转、放缩以及由以上攻击组成的复合攻击,具有较好的鲁棒性。 更多还原

【Abstract】 As the invariant function for some of the transform has non-denatured,a robust on the watermarking algorithm geometric transformations for geo-spatial vector data is proposed.Firstly,the conception and charac-teristic of invariant function were presented.Secondly,an invariant robust function to rotation,scaling and translation was proposed and proved,then based on the obtained invariant function,by embedding watermark into the geometric invariant,a watermarking algorithm for geo-spatial vector d... 更多还原