JPEG压缩域图像水印及抗同步攻击音频水印算法研究

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1、西南交通大学硕士学位论文JPEG压缩域图像水印及抗同步攻击音频水印算法研究姓名：王峰申请学位级别：硕士专业：密码学指导教师：王宏霞20080401西南交通大学硕士研究生学位论文第1I页AbstractAscomputertechnologybecamemoreadvanced，networkdeveloped谢tllrapidpace，andmulti—mediaroseonamazinglyhighspeed，informationsecurityhascometoallincreasinglyseriousproblemwhichCalln

2、otbeignored．Therefore，digitalwatermarkingtechnologyturnedtobeavailableinmanyaspects，suchascopyrightprotection，modificationauthentication,receiptcheckingandmarkhiding．Theresearchofwatermarkingtechnologycallbepartedintoimagewatermarking，audiowatermarking，andvideowatermarkingfr

3、omthecarrierangle，whenitCanbepartedintowatermarkingprotocol，watermarkingcapacity,watermarkingevaluationstandardandwatermarkingalgorithmfromthestudydirectionangle．nlisdissertationfocusesonwatermarkingalgorithmaspect，andthemainworkshowsasfollowing．(1)Anewwatermarkingalgorithmb

4、asedonJPEGimageinthecompresseddomainhasbeenproposed．Intherealapplication，digitalimagesarealwayssavedwithcompressedformat．Thjsleadsmostwatermarkingalgorithmstobeinvalid．硼1eJPEGimageshouldespeciallybeunderlinedandstudiedduetoitsbroadapplication．ComplywithJPEGstandard，anewalgor

5、ithmhasbeenproposed，whichembedsinformationinthequantizationDCTcoefficients，adoptsfour-codewatermark谢tlldivide-modulus--get--residueembeddingmethodtoexpandwatermarkingcapacity,andUSeSdouble-embeddingmethodtoenhancetherobustnessofthealgorithm．(2)Anewaudiowatermarkingalgorithmt

6、osolvesynchronizationproblemhasbeendesignedandimplemented．Inthisdissertation，thebiggestvalueisselectedasthesynchronizationmark,whichisthesumofthesequentialaudiodataofthesamenumbersinthewholetestingaudiodata．ItsgreatestadvantageisthatitCanmakefulluseofaudioinformationitself,a

7、nditisapplicabletovariouskindsofaudiocarrier．Moreover,combinedwithpsychoacousticauditorymodel，thewatermarkinformationiSembeddedinthefrequencytransforillcoe伍cient．whichCaninfluencetheaudioqualityleast．Tlliswillmakethewatermarkedaudiocontenttotheinaudiblerequirement．What’Smore

8、，thealgorithmadoptsbinaryimage弱watermarkduetohumanvision’Sbettererrortolera