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1、ComputerEngineeringandApplications計(jì)算機(jī)工程與應(yīng)用2007,43(5)189一種印刷品數(shù)字水印防偽方法1234周季峰,龐明勇,李黎,潘志庚1234ZHOUJi-feng,PANGMing-yong,LILi,PANZhi-geng1.南京大學(xué)計(jì)算機(jī)科學(xué)與技術(shù)系,南京2100932.南京師范大學(xué)教育技術(shù)系,南京2100973.杭州電子科技大學(xué)計(jì)算機(jī)學(xué)院,杭州3100184.浙江大學(xué)CAD&CG國家重點(diǎn)實(shí)驗(yàn)室,杭州3100271.DepartmentofComputerScience&Technology,NanjingUniversity,
2、Nanjing210093,China2.DepartmentofEducationalTechnology,NanjingNormalUniversity,Nanjing210097,China3.SchoolofComputerScience&Technology,HangzhouDianziUniversityofScienceandTechnology,Hangzhou310018,China4.StateKeyLabofCAD&CG,ZhejiangUniversity,Hangzhou310027,ChinaE-mail:panion@graphics.nju
3、.edu.cnZHOUJi-feng,PANGMing-yong,LILi,etal.Anti-counterfeitstrategyforpressworkbasedondigitalwatermarktechnology.ComputerEngineeringandApplications,2007,43(5):189-192.Abstract:Withtheemergingofhigh-resolutionscannerandprinter,thestudyofcopyrightprotectionforpressworkbecomesanimportantrese
4、archrealm.Basedonanalyzingthegeometricandpixelvaluedistortionoftheimagescannedfromlegalandpi-ratedversionsofpressworkrespectively,weproposeadigitalsemi-fragilewatermarkbasedcopyrightprotectionmethod.ThemethodfirstembedswatermarkintothegeometricinvariantFourier-Mellindomainofanimagetoweake
5、nthegeometricdis-tortion,broughtbyprintingprocess,ofthewatermarkinpresswork,andtheimageisthenusedtocreatepressworkviaalegalprintingprocess.Secondly,themethodrectifiesrescannedimagefromthepressworkbyusingRadontransformationandtheem-beddedwatermarkinitisdetected.Sincethereisanobviousdiffere
6、ncebetweenthedestructiondegreesofthewatermarkcausedrespectivelybylegalandpiratedprintingprocess,wecanjudgewhetheracopyofpressworkisvalidornotjustbycomputingtheratioofthesuccessfullyderivedwatermarkandcomparingitwithapredefinedthreshold.Theexperimentsshowthatourmethodovercomestheshortcomin
7、goftheexistingalgorithmsandcanbeusedincopyrightprotectionofvariouspresswork.Keywords:digitalwatermark;anti-counterfeittechnology;Fourier-Mellindomain;radontransformation摘要:隨著高分辨率掃描印刷設(shè)備的出現(xiàn),印刷品的版權(quán)保護(hù)成為重要的研究課題。在分析圖像經(jīng)歷正版與盜版印刷過程后幾何和像素點(diǎn)失真情況的基礎(chǔ)上,提出一種基于數(shù)字水印技術(shù)的印刷品防偽方法。該方法先將水印
