基于對(duì)稱和運(yùn)動(dòng)向量相角的新型數(shù)字水印算法.pdf

1、天津大學(xué)碩士學(xué)位論文基于對(duì)稱和運(yùn)動(dòng)向量相角的新型數(shù)字水印算法姓名：王波申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)科學(xué)與技術(shù)指導(dǎo)教師：操曉春201111ABSTRACTWiththedevelopmentofinformationtechnologyandcomputernetworks，digitalvideoandpictures，whichtakesarichamountofinformation，arewidelydisseminatedin

2、networksThathasintroducedgreatchallengefortheauthenticityandcopyrightprotectionofthemultimediaDigitalwatermarkasanewcopyrightprotectiontechnology，embedswatermarkintothemultimediaandextractsthewatermarkinfolrmationtoident

3、ifythecopyrightItattractsmuchmoreattentionduetoitssignificantroleThispaperaimstofindabettersolutiontothecopyrightprotectioninmultimediabasedonthedevelopmentoftechnologyoftoday’smultimediaandtheoutstandingachievementsfort

4、hecurrentdigitalimageprocessingThepaperproposesnewwatermarkalgorithmsbothinwaterflippedimagesandh264一encodedvideos，facingtheshortcomingsanddeficienciesofcurrentwatermarkmethodsandtheproblemintheapplicationofdigitalwaterm

5、arkingprocessForthewater。flippedimages，theDaperusetheMirrorreflectionInvariantFeatureTransform(MIFT_SIFT)tochoosetheDositionofthewatermark，anddesignthewatermarkingmethodinthefrequencydomainsothatthealgorithmisresistantto

6、geometricattacksandotherdigitalsignalattackswhileminimizingtheinfluencetotheoriginalimage；Forthemostpopularh264videothevariousaspectoftheencodingprocessaredeeplystudiedAnimprovedphaseanglebasedvideowatermarkingalgorithmi

7、sproposedduringtheInterencodingprocess，andevaluatedonstandardvideosequences，whicheffectivelyeliminatesthedistortionintroducedbyembeddingwatermarks，andkeepsalowbitratewhilepreservinghighqualityofthevideoKEYWORDS：DigitalWa