基于小波包和邊緣檢測的自適應(yīng)數(shù)字水印算法.pdf

1、青島大學(xué)碩士學(xué)位論文基于小波包和邊緣檢測的自適應(yīng)數(shù)字水印算法姓名：周娜申請學(xué)位級別：碩士專業(yè)：計算機應(yīng)用技術(shù)指導(dǎo)教師：范延濱20080605AbstractDi酉talWatermarkingisaneffectivemeasurevalidityofinformationImperceptibilityandtoguaranteethesecurityandRobustnessarecontradictorycharacteristi

2、cs，ifoneisstrong，theotherwillbeweakenedTherefore，watermarkingalgorithmsusuallysatisfyonecharacteristicwhiledissatisfyanotherFortheembeddingposition，lowfrequencyareacansatisfyrobustnesswell，whilehighfrequencyareaimpercept

3、ibilitySohowtoharmonizethetwocharacteristicsiskeypointsofthewatermarkingresearchOnthebasisofanalyzingexistingalgorithmsdeeplythisthesismainlystudywatermarkingalgorithmbasedonwaveletItImprovesflawsofexistingadaptivealgori

4、thms，andbringsforwardtwonowadaptivealgorithmsbasedonwaveletpacketandwaveletedgedetectionThemainachievementsofthisthesisareasfollowing：1Thethesisintroducesthedevelopmentofdigitalwatermarkmethods，inwhichemphasizeparticular

5、lyonmethodsbasedonwaveletItanalyzesandcomparesvariousofwatermarkingalgorithmsthroughreadingalargenumberofliteratures，andsummarizestheiradvantagesanddisadvantages2ThethesisstudiesWaveletAnalysis，Multi—resolutionAnalysisan

6、dWaveletPacketAnalysisAccordingtotheabovetheorylocatingsuitableembeddedpositionforwatermarkviaordering，thencomputescorrespondingembeddedintensityadaptivelyThus，thisalgorithmharmonizeimperceptibilityandrobustnesseffective

7、ly3Onthebasisofanalyzingwatermarkingalgorithmsbasedonwaveletpacket，anewmethodbasedonwaveletedgedetectionisproposedaccordingtoitsexcellentcharacteristicThismethodsuccessfullyresolveshowtoselectfittingembeddedpositionandin

8、tensitymoreaccuratelythroughcomparingeverysub—blockwiththe“sample’rootinedgedetectionConsequently，thealgorithmholdsmoresteadywatermarkingcapabilitiesKeywords：digitalwatermark；adaptive；waveletanalysiswaveletpacketanalysis