感興趣區(qū)域圖像壓縮與可見水印技術(shù).pdf

1、分類號：密級：公開公開學(xué)號：2007164單位代碼：10407碩士學(xué)位論文論文題目:感興趣區(qū)域圖像壓縮與可見水印技術(shù)感興趣區(qū)域圖像壓縮與可見水印技術(shù)研究方向基于小波包的數(shù)字信號處理基于小波包的數(shù)字信號處理專業(yè)名稱通信與信息系統(tǒng)通信與信息系統(tǒng)研究生姓名朱媛媛導(dǎo)師姓名、職稱張小紅張小紅教授教授2009年12月28日江西贛州IIAbstractWithrapiddevelopmentofmultimediatechnologytheamoun

2、tofimageinfmationbecamelargerlargersoitneedslargestagecapacityawidebtransptationchannel.Imagecompressionisachievablebecauseoftheredundantinfmationbetweentheadjacentpixelsinanimagenowithasbecomeahotspot.Indertosatisfyallk

3、indsofapplicationrequirementindifferentenvironmentthestardofimagecompressionsystemhasbeenimproveditnotonlyrequiresahigherperfmanceoncompressionbutalsoneedsothernewfunctions.Atpresentintheaspectofimagecompressionembeddedc

4、odingalgithmbasedonwavelettransfmisthekeytechnologyincreasinglyimptancehasbeenattachedtoit.IndertoimprovethequalitysaftyofROIafterimagecodingdecodingprocesssomeresearchonimagesegmentationhasbeendoneROIextractionsuchascol

5、imagecompressionROIcodingvisualwatermarktechnologytheachievementscanbeconcludedasfollows:⑴Bystudyingtheenergydistributionofthecolchannelsinthetransfmedcolspacethequantitativemethodinthetraditionalembededcodinganewquantit

6、ativemethodfcolimagecompressionwasdesignedwhichisbasedonthedistributingofwaveletcoefficients.CombinedwiththekeystoneofSPIHT(setpartitioninginhierarchicaltreesalgithm)thewaveletcoefficientsineverycolchannelarequantizedcod

7、edinunity.Incomparisonwiththeiginalquantitativeschemethenewschemegivesbetterimagecompressionperfmanceespeciallyinthelowerbitratethereconstructedimageafterimpressionhashigherquality.⑵Combinedwiththesignificantacteristicof

8、humaneyesmphologicalwatershedalgithmthispaperdesignedanewsegmentationregionofinterestextractionalgithmusedfthecolimage.Afterthesegmentationprocesstheimageretainedaveryfineedgeofthetargetsoversegmentationcausedbywatershed

9、algithmhasbeengreatlyimprovedROIcanbeexactlyextractedfromsimplebackground.⑶TheROIextractionmethodcanbeappliedinROIcodinginlargecompressionratetheexperimentresultshowsthatthequalityofROIinreconstructedimageishigherthanBG(

10、background).⑷AnadaptivevisualwatermarktechnicalinROIwasdesignedwhichcanbetterprotectthecopyrightoftheimage.Theembeddingdepthisfixedbyeverypixel?stexturefeatureofhostimage.Inwaveletdomainthevisualwatermarkisembeddedintoth

11、eregionofinterestintheimageadativelythisstepcanbesetduringtheimagecoding.ExperimentalresultshaveshownthatwatermarkedimagemeettherequirementsofvisiblewatermarkquitewellwatermarkistranslucentlyshowingintheimageROIdoesrecei