张黎明, 闫浩文, 齐建勋, 张永忠. 基于DFT的可控误差矢量空间数据盲水印算法[J]. 武汉大学学报 ( 信息科学版), 2015, 40(7): 990-994. DOI: 10.13203/j.whugis20130686
引用本文: 张黎明, 闫浩文, 齐建勋, 张永忠. 基于DFT的可控误差矢量空间数据盲水印算法[J]. 武汉大学学报 ( 信息科学版), 2015, 40(7): 990-994. DOI: 10.13203/j.whugis20130686
ZHANG Liming, YAN Haowen, QI Jianxun, ZHANG Yongzhong. A Blind Watermarking Algorithm for Copyright Protection of Vector Geospatial Data Under Controllable Errors Based on DFT[J]. Geomatics and Information Science of Wuhan University, 2015, 40(7): 990-994. DOI: 10.13203/j.whugis20130686
Citation: ZHANG Liming, YAN Haowen, QI Jianxun, ZHANG Yongzhong. A Blind Watermarking Algorithm for Copyright Protection of Vector Geospatial Data Under Controllable Errors Based on DFT[J]. Geomatics and Information Science of Wuhan University, 2015, 40(7): 990-994. DOI: 10.13203/j.whugis20130686

基于DFT的可控误差矢量空间数据盲水印算法

A Blind Watermarking Algorithm for Copyright Protection of Vector Geospatial Data Under Controllable Errors Based on DFT

  • 摘要: 传统的DFT(discreteFouriertransform)变换域水印算法中,水印直接嵌入变换后的系数,导致矢量空间数据误差较大。针对此类算法的缺点,本文提出了基于DFT的可控误差矢量空间数据盲水印算法。该算法通过放大处理DFT变换系数,将水印嵌入幅度系数和相位系数中,水印提取采用投票原则,无需原始数据的参与。试验表明,水印嵌入矢量空间数据引起的误差很小;水印对数据格式转换及常见的几何变换攻击具有很好的鲁棒性。

     

    Abstract: InDFTwatermarkingalgorithms,thewatermarksareoftenembeddeddirectlyinthetrans formationcoefficients,causinglargeerrorsinwatermarkeddata.Toovercomesuchdisadvantageofthesealgorithms,ablindwatermarkingalgorithmforcopyrightprotectionofvectorgeospatialdatabasedonerrorreductionisproposed.ThisalgorithmamplifiestheDFTtransformcoefficientsandem bedsthewatermarksintheamplitudecoefficientsandphasecoefficientsbyDFTtransform,andthewatermarkisembeddedseveraltimes.Inaddition,thevotingprincipleisutilizedtodetectthewater mark.Nooriginaldataisneededinthewatermarkextractionprocedure.Theexperimentshaveshownthatspatialaccuracyofthewatermarkeddataisacceptableandthealgorithmisrobusttoavarietyofgeometrictransformationattacks.

     

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