数字水印技术及应用研究

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1、电子科技大学博士学位论文数字水印技术及应用研究姓名：边杏宾申请学位级别：博士专业：计算机应用技术指导教师：朱清新20080901摘要的若干安全问题，而且使子协议之间的划分更清晰。6．提出了数字水印空间概念，通过改进离散空间静态目标的最优搜索模型和求解方法，建立了数字水印空间中多副本水印的最优提取序列。多副本数字水印方案能够全面提高数字水印的鲁棒性，但是受到攻击后不能确定哪个数字水印副本存在，如果采用穷尽搜索的方式会花费大量时间，而最优提取序列能使提取到数字水印的期望时间最小。关键词：数字水印，小波变换，图像归一化，支持向量机(SVM)，视频保护，最优搜索ⅡABS

2、TRACTWiththerapiddevelopmentofIntemetanddigitaltechnology,digitalproductsbecomemoreandmorepopular,mainlybecausetheyCallbetransmittedconveniently,buttheproblemofcopyrightprotectionisalsomoreandmoreserious．Theinapplicabilityoftraditionalinformationsecuritytechnologyforcopyrigbtsproblem

3、promotesthedevelopmentofdigitalwatermarking．Digitalwatermarkingtechnologyembedsdi百talwatermarkindigitalmediathatpro、，idescopyrightprooffortheowllerofdigitalmedia．Robustnessandinvisibilityaretwoimportantfeaturesofdigitalwatermark．Theblinddetectionpropertycanfacilitateapplicationofdigi

4、talwatermarking．Thisdissertationthoroughlystudiedthewatermarkingtechnologyandtheapplications．Themaincontributionsalelistedbelow：1．Arobustdigitalwatermarkingschemebasedontemplatematchingisproposed．Thedi}gitalwatermarkisembeddedinthewavelettransformdomainaccordingtoatemplate．Thisscheme

5、realizesblindwatermarkextractionwithoutanyextrainformation．Bysharpeningthewatermarkedimagebeforeextraction,theprecisionoftheextractedwmermarkisenhanced，thustherobustnessofthewatermarkisimprovedagainstimageprocessingandlossycompressionete．．2．Anewschemeforembeddingwatermarkinnormalized

6、featureareaispresented，thateliminatessomeproblemsinMIBIN(MomentInvariantBasedImageNormalization)．MIBINhasbeenusedinwatermarkingschemestoresistgeometrictransformattacks，however,thestabilityofthenormalizedimageandwatermarkextractionCallbeaffectedbytheembeddedwatermarLgraylevelhistogram

7、adjustment,andcontentremovaletc．Thustherobustnessofthedigitalwatermarkisdamaged．FromMmINtheory,somesolutionstotheseproblemsaregiveninthisscheme．3．AwatermarkingschemebasedonSVM(SupportVectorMachine)ispresented,therobustnessoftheschemecomesfromthegoodlearningandgeneralizationabilityofS

8、VM，thewaterm