抗几何攻击的数字图像水印技术的研究

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1、南京理工大学博士学位论文抗几何攻击的数字图像水印技术的研究姓名：李健申请学位级别：博士专业：计算机应用技术指导教师：叶有培20090601AbstractInformationhidingisthetechniquetoembedsecretinformationforcovertn．ansmission．whichistheveryactiveandimportantcomponentintheresearchofinformationsecurityfield．Digitalwatermarkingisallimportantbranchofinformation

2、hiding，whichisakindoftechniquetosolvemultimediainformationsecurityproblemonnetwork，andisthecrossedsubjectinvolvinginformationsecurity,multimediasignalprocessing，patternrecognitionandetc．Atpresent，watermarkingtechniquebecomesaneffectivemeanstomultimediacopyrightauthenticationanditsintegr

3、itysafeguarding．But，itsperformanceofwithstandinggeometricattacksseriouslyrestrictestheuserangeofdigitalwatermarking．Resistancetogeometricattacksisthecoreanddifficultyproblemofdigitalwatermarking，anditisalsothebottleneckinpracticaluse．Thisdissertationtakesstillimagesasexamples，analysesth

4、eexistingdigitalwatermarkingapplicationsagainstgeometricattacks，andstudiesthedigitalwatermarkingtheoryandtechniquesbeingfitforresistingthegeometricattacks．Then，somealgorithmsareproposedtowithstandthegeometricattacksfromthreepointsofresearch：geometricinvariantfield,geometriccorrection，an

5、dpattemwatermarking．Themaincontributionsareenurmeratedasfollows：First，theimagewatermarkingschemebasedonSIFTfeatureisproposed．WeusethefeaturepointstoconstructtheDelaunaytriangularmask，then，callmakethetrianglestoagainstgeometricattacksbasedontheSIFTpoints’Sabilityofresistinggeometricattac

6、ks．And，watermarkingisembeddedintheimagecontentaccordingtheseveral．for-oneprinciplebyadditivemethod．Second，anoveldigitalwatermarkingalgorithmbasedonsingularvaluedecompositionisproposed．Thealgorithmmakessingularvaluedecompositiononblocksofamplitudesinfrequencydomain，andembedwatermarksviam

7、odifyingthesub-maximumsingularvalue．Usethegeometricinvariantofsingularvaluetorealizethegeometricinvariantofwatermarkingapplication．Third，basedonthepointofgeometriccorrection，twonewwatermarkingmeansareproposedonthebasisofthetheoriesofinvariantcentroidandgeometricmoment．Thegeomet