基于非線性理論的數(shù)字水印技術(shù).pdf

1、y1037159學位論文@基于非線性理論的數(shù)字水印技術(shù)張民指導教師張英俊教授申請學位級別工學碩士專業(yè)名稱交通信息工程及控制學位授予單位大連海事大學2007年3月英文摘要TheDigitaIWatermarkingBasedOnNon—IinearTheoryAbstractInthispaper，basedonthechaosandfractaltheory，theresearchhasstudiedtheapplicationofth

2、enonlineartheoryindigitalwatermarkingasfollows：Firstly，basedontheHilbertfractalcurveandIterativeChaoticM印withInfiniteCollapses(ICMIC)anovelimagespatialdomaindigitalwatermarkingalgorithmisproposedTheproposedschemeconsider

3、sthefeaturesofthehumanvisionsystem(HVS)veryrichlyBecausethesensitivityofthefiatregionoutbalancesthetextureonebydealingwiththeoriginalimagethetexturedomaincanbeseparatedfromtheoriginalimageveryeasilyThewatermarksareembedd

4、edintheseregionsThisschemedoesnotcauseanydistortionoftheoriginalimageandhashi曲fidelityTheoriginalwatermarkingisscrambledbyusingasimpleandreversiblemethodThechaosmaphasthetraitofrandomicityandsensitivitytotheinitialvalueT

5、heembeddingplaceisdeterminedbythechaosmapByusingthecharacterofthechaosthesecurityisimprovedveryobviouslyByusingthestrategyofminimizingchangesofhostimagepixelsandstatisticalmethod，weachievetheresultsthatthedigitalwatermar

6、kingissightlessWhenabundantwatermarkingisembeddedwealsoachievetheunificationofthesightlessnessandtherobustnessTheexperimentalresultsshowthatthewatermarkisrobustagainstthecutattack，saltpeppernoiseattackLSB(1eastsignifican

7、tbit)attack，manyoflowbitsdamageattackandwinnerattackSecondly，basedonthefractalimageencodinganddecodingtheory，anovelfiactalimagedigitalwatermarkingalgorithmispresentedThewatermarksareembeddedintoeverypixeloftherangeblockw

8、hichmakesthetamperingbecomeveryhardUsingthestrategyofthebestmatchintheembeddingprocess，thecomplexityisminished，ThereconstructedimagehasbeenshowedveryclearlySimulationresultsshowthesuperiorperformanceofthemethodsanddemons