摘要
In2011,Chanproposedanimageauthenticationmethodbyproducingtheparitycheckbitsfrompixelswhosebitshavebeenrearranged.Duetothisrearrangement,thevalueofthemost-significantbitofeachtamperedpixelcanbedeterminedaccordingtoitsparitycheckbits.Withthehelpofthemost-significantbitofthepixel,thepixelcanberecoveredbyselectingtwopossible(7,4)Hammingcodewords.However,ifthedistancebetweentwoHammingcodewordsiswithinacertainrange,incorrectselectionmayoccur.Chan'smethodaddedoneadditionalbittoindicatethecorrectone.Itistrivialthatthismaydegradethequalityoftheauthenticatedimage.Inthispaper,wegroupfourmost-significantbitsintodifferentgroupstoformamappingcodebookandthemappingcodebookisusedtoproduceauthenticationdatainsteadofthe(7,4)Hammingcodebook.Theexperimentalresultsshowthattheproposedmethodhasagreaterabilitytorecovertamperedareas.
出版日期
2013年01月11日(中国期刊网平台首次上网日期,不代表论文的发表时间)