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

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