一種基于DCT和SVD的圖像數(shù)字水印方案的研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文一種基于DCT和SVD的圖像數(shù)字水印方案的研究姓名：胡皓申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)應(yīng)用技術(shù)指導(dǎo)教師：薛勝軍20070401武漢理工大學(xué)碩士學(xué)位論文AbstractAsthecomputercommunicationtechnologyisrapidlydevelopingthetransmissionofdigitalmultimediainformationbecomesmoreconvenientThei

2、ntemethasbroughtalotofchancestothecommercescientificresearchandentertainmentviaSOmenewkindsofservicesuchaselectronicpublishingelectronicadvertisement，datawarehouse，di’gitallibraryinternetvideoandaudio，eot3mnlerceOntheoth

3、erhanditalsobringsUSanurgentandimportantproblemthathowtoprotectthecopyrightofmultimediadataThetechniquesofencryptionandscramblingc躚ensu托thesecurityoftheproducttosomeextentHowevertheauthorizeddigitaIproductswillbeillegall

4、ycopiedandtransmittedoncetheyaredecryptedAsanewtechnologythedigitalwatermarkingmethodhasbeenproposedtoavoidtortiousItsessentialistoimplementtheinformationhidingbyutilizingtheimageprocessingThekeypointisembeddingthewaterm

5、arkintothehostimageandsimultaneouslymaintainingitstransparencyThewatermarkwhichbearstheinformationofcopyrightandcertificationc柚identifytheauthorownerpublisheranduserandthusguaranteethelegalcopyandtransmissionWefirstbrief

6、lyintroducetheconceptofwatermarkanditsbackgroundandemphasizeitsimportanceintheapplicationThenwereviewinsomedetailtheexactdefinitionofwatermarkitsclassificationandcharacteristicsSecondtheexistingdigitalwatermarkingmodelsa

7、rcdiscussedanddividedintothreecategorieswhichcorrespondtothethreestagesofthewatermarkingtechnique，ieembeddingextractionandtestingrespectivelyWedetailedlyelucidatethealgorithmsofwatermarkingsuchasspatialdomainandfrequency

8、domaintransformationandtheSingularValueDecomposition(SVD)InadditionthepreprocessingoftheimagecanalsoplayanimportantroleinSomewatermarkingalgorithmsThereforeweenumerateseveralmethodsofimagescramblingsuchasArnoldcatmapping