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1、ComputerEngineeringandApplications计算机工程与应用2007,43(5)189一种印刷品数字水印防伪方法1234周季峰,庞明勇,李黎,潘志庚1234ZHOUJi-feng,PANGMing-yong,LILi,PANZhi-geng1.南京大学计算机科学与技术系,南京2100932.南京师范大学教育技术系,南京2100973.杭州电子科技大学计算机学院,杭州3100184.浙江大学CAD&CG国家重点实验室,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:随着高分辨率扫描印刷设备的出现,印刷品的版权保护成为重要的研究课题。在分析图像经历正版与盗版印刷过程后几何和像素点失真情况的基础上,提出一种基于数字水印技术的印刷品防伪方法。该方法先将水印
