基于混沌的數(shù)字水印算法研究.pdf

1、哈爾濱工程大學(xué)碩士學(xué)位論文基于混沌的數(shù)字水印算法研究姓名：夏宇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：光學(xué)工程指導(dǎo)教師：張興周20070201哈爾濱亡程大學(xué)碩十學(xué)位論文●●_●●■__●______●●●_●●●_●_●_●_●__●__●●●_●__●|_目_●__●_____●___一IAbstractWinltherapiddevelopmentofcomputernetworktechnologyandmultimediatechnologym

2、ultimediadataiSbecomingthemainsourcefromwhichpeoplegetinformationfromandmultimediadataisbecomingallimportantcomponentofpeople’slifeToprotectthecopyrightofthedigitalproductowneriSbecomingmoreandmoreimportantasanimportantf

3、actorofkeepthedevelopmentofdigitalmediaindustryingoodshapebutthetraditionalinformationsecuritytechnologyandencryptiontheorycan。tsolvetheproblemofdigitalproductcopyrightprotection，watermarkingtechnologyrisesupmthiscaseWat

4、ermarkingtechnology，asallimportantmethodofprotectingcopyright，areunderabroadresearchandapplicationatpresentWatermarkcapprovetheownershiporintegralitythroughembeddingsecretdatawatermarkintheoriginaldatathusitCanprorectsth

5、edigitalproductfrompirateandtamperInthepaper，thetechnologyandapplicationofthedigitalimagewatermarkingaredeeplyanalyzedandstudicdthemainWOrkisasfollows：n)Wemakearecapitulativesummarizeandanalysisforthebasicknowledgeofdigi

6、talwatermarkingtechnologyfromitsorigin，basiccharacter，sort，commonmodel，mainapplicationfieldandSOon(2)ThecharacterofthechanticsysternissummedupThispapersummarisesthedevelopmenthistoryofchaosanditiSanemphasesofdiscussingab

7、outtheLyapunovexponentandthechaosattractor(3)InthispaperanimprovedalgorithminDCTdomainbasedonchaoticsequenceiSproposedExploitingsomecharacteristicsofHumanVisualSystem(HVS)watermarkiSadaptiveembeddedintotheDCcomponentsoft

8、heoriginalimagenleexperimentalresultsshowthatthewatermarksareinvisibleandrobustagainstnoiseandcommonlyusedimageprocessingmethodssuchasGaussianJPEG，Medianfliteringere(4)AnewdigitalinmgewatermarkingalgorithmiSproposedinthi

9、spaperbasedondiscretewavelettransforlnandchaoticshufileInthisalgorithm，inordertoenhancethewatermarkingencryptionandvisioneffectoftheextractedwatermarkingfirstlyatwovaluewatermarkingsignalshouldbedealtwithbyshufneAtthesan

10、letimeDWThasfavorablefrequencycharacterandthemultiplayerdecomposeanalysesisidentiealwithhuman’svisioncustomsuchisspecialusefulforselectingembeddingpositionandintensioninDigitalWatermarkingSimulationresultsshowthatsuchsch

11、emeiSgoodattransparenceandrobustagainstcropping，filter，noisedisturbanceandSOonEspeciallyforJPEGcompressionclearmarkCanbestillextractedfromthecompressedwatermarkedimageeventhereisgreatdegradationinwatermarkedimageKeywords