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1、1000-9825/2004/15(08)1245©2004JournalofSoftware软件学报Vol.15,No.8∗基于混沌映射的鲁棒性公开水印1,2+11王宏霞,何晨,丁科1(上海交通大学现代通信研究所,上海200030)2(西南交通大学计算机与通信工程学院,四川成都610031)RobustPublicWatermarkingBasedonChaoticMap1,2+11WANGHong-Xia,HEChen,DINGKe1(ModernCommunicationInstitute,ShanghaiJiao
2、tongUniversity,Shanghai200030,China)2(SchoolofComputerandCommunicationsEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)+Correspondingauthor:Phn:+86-21-62933320,Fax:+86-21-62829071,E-mail:whongxia@sjtu.edu.cn,http://ee.sjtu.edu.cnReceived2003-10-09;Acc
3、epted2003-12-08WangHX,HeC,DingK.Robustpublicwatermarkingbasedonchaoticmap.JournalofSoftware,2004,15(8):1245~1251.http://www.jos.org.cn/1000-9825/15/1245.htmAbstract:AnewrobustpublicwatermarkingalgorithminDCT(discretecosinetransform)domainispresented.Duetogoodrand
4、omnessandeasyreproducibilityofchaos,thewatermarkisfirstlypermutedbythehashedchaoticsequence,thenasmallnumberofreferencepointsarerandomlyselectedinthemiddlefrequencybandsoftheDCTdomainbasedonthechaoticsequences,andthebatch-typedisorderwatermarkbitsareembeddedintot
5、heneighborhoodofeveryreferencepointusingodd-evenquantization.Theusefulnessofmultilevelchaotickeysandprivacyofmodificationtofrequencycoefficientsenhancethesecurityofwatermarkinformation.Theblindextractionofwatermarkinginformationisrealizedunderguaranteeingthatalar
6、gercapacityandsignificantbinarywatermarkishidden.Moreover,areasonabletrade-offbetweentheinvisibilityandrobustnessisobtained.Keywords:chaos;publicwatermarking;robustness;discretecosinetransformation;imageprocessing摘要:提出了一种新的DCT(discretecosinetransform)域鲁棒性公开水印算法.该
7、算法利用混沌随机性好和容易再生的特性,首先用散列处理后的混沌序列置乱水印,而后基于混沌序列在宿主图像DCT域的中频带随机选择少量参考点,并在其邻域内用奇偶量化法批量嵌入乱序水印比特.多级混沌密钥的使用与频域系数修改的隐蔽性,加强了水印信息的保密性,在保证隐藏较大容量的有意义二值水印图像的同时,实现了水印信息的盲提取,并在水印的不可见性与鲁棒性之间达到了合理的折衷.关键词:混沌;公开水印;鲁棒性;离散余弦变换;图像处理∗SupportedbytheNationalHigh-TechResearchandDevelopmen
8、tPlanofChinaunderGrantNo.2002AA144110(国家高技术研究发展计划(863));thePostdoctoralScienceFoundationofChinaunderGrantNo.2003033304(中国博士后科学基金)作者简介:王宏霞(1973－),女,河北赵县人,博士,教授,
