基于小波變換的數(shù)字水印方法.pdf

1、中國海洋大學(xué)碩士學(xué)位論文基于小波變換的數(shù)字水印方法姓名：張麗申請學(xué)位級(jí)別：碩士專業(yè)：信號(hào)與信息處理指導(dǎo)教師：姬光榮2003.5.1TheDWT—‘basedDigitaIWatermarkingMethodAbstractAtpresent，digitalwatermarkingt∞hnologyisanewsortofcopyrightprotectiontechnologyanditcarlbeextensivelyusedinth

2、elieJdsofd睜詛1workcopyrightprotection，convertcommunicationandthebillguardagainstfaisenesaincommercialtransactionandecommerceetcNowadays，themethodsoftheres∞xehofdigitalwatcrm破chieflyconcentrateOilthehidingintimedomain，spac

3、edomainandtransformdomaininadditionthemisthedigitalwatermarkingalgorithmbasedonthefileformatlindallTierfomunionuxhnoto掣DWTisakindofeffe甜venewm武hodldterFouriertlansfolllinthefieldofthewatermarkingresearchChieflytherearesc

4、v酉alk址ofmethodsin蛔d醺digitalwatermarkintotheDWTdomain：(1)ThemuRiyardstick硼岫哪盈HngtechnologywhichisbasedontheDWT(2)Thedigitalwatermarkingalgorithmwhie出isbasedoilwawdetIi衄蟾(3)Tbesensitivewatermarkingalgorithmwhichcanecrtify螗

5、幽彝硎onof姻6胡l巧i嘴(4)EmbeddingmanykindsofwatermarkatthesametimewtfichisbIsedOllinteg囂w職l畦Atpresent，theusefulnessofd／gitIJwsmmmk蚤m州妒is細(xì)口柚p∞留：(1)Hidingsecretandindividualil幽lXlllafioll∞protectthe∞∞嘞ofworks(2)Provingthereliabil

6、ityofworks01“inmI珂wofdsthe柏琳ofcontentthecontentauthenticityanddatacompletenesswhichislIocIIedinmfc咖：ellllifll幽n(toprovewhetherthereisinterferenceordistortion)Thewatermarkingtechnology出軾∞摹。dinthispp叮is矗tl孵lbc_pplieationin

7、thesecond雒peckanditmakesitifthesignalsaddedw_玎m孤kinghaveanyd_镩：ethedetectedwatermarkwonLtbeconstantwiththepreviouso雎，thuswcc柚poimoutthe“瑚羽n∞∞ofinterferenceanddistortionThecontributionofthisthesisisfollo城ng：1Takingadvanta

8、geofthefeamnofmveletandhuman掣∞‘visua／masktodoseparateD、)I，T幻primaryimageandwatermmkbYcombinmg口姆鰣g叫inMlgeanddetailsubgraphofthewatermarkingimageinthesa蹴di圮dio艮r(nóng)1磚nI略ispl置腳如∞Ilemeofwatermarkingtechniquewhichembedsthewaterm

9、arkinb簪嘶ed∞thc猢瞞l曩硼|Ilim∞i面on2Analyzingtheinfluenceofthem址嘶ofaigi叫w越目叫hmabcddedintotheprimaryimageGenerallyspeakingIfme口Ⅵ山tbgnna吐lew鼬口m誓bn矗isstable，buttheinfluencetotheprimaryimageisobviousinotlm“woras出cw砒日m|lI^visualimp

10、ercepfionisbad；onmecontraryifthenvalueissmutne喇ler咖帖visualilnj躥螄isgood，buttherobustnessofthewatermarkingisworse(Ⅺmjdoringtherequlremcmofwalcrmarksrobustnessandimperception，wepresentamethodwhichcandefinitetheintensityofth

11、eiIngeembeddedbydigitalwatermarkbythecontentofimageTakingLmlaimageforexample，wegi飩outamethodtoselectthedvalue3、Forthememod‘sperform‘nceevaluation，wesharpen，filterenlargeandshjrktheimage，addchirpchangethebalanceandsoontod