ecient internet image transfer for wireless networks

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1、E ient
nternet
mageTransferForWirelessetworksohanGar ia,AnnaBrunstromDepartmentofComputerS ien earlstadUniversity,SwedenE-mails:johan.gar iakau.se,anna.brunstromkau.seAbstra t
nordertospeedupthetransmissionofimagesoverslowwirelesslinks,imagere oding anbeperform

2、edtoin reasethe ompressionlevelandredu ethewaitingtimes.Thispaperfo usesontheproblemofimagere odingforwirelessWebappli ations.erforman emeasurementsontheimplementationofane ientDCTdomainre oderforEGimagesarepresented.TheyshowthatFigure1:roxysetupotherre odersneed

3、twotothreetimesmorepro- essingtimefortypi alWebimages.The on eptofprogressiveparsingreodingisalsointrodu edasaRabb
T[7℄andaproxybyZenelandDu hamp[8℄.Ameansforhighlye ientre odingofprogressivelynumberof ommer ialproxybasedsystemssu hasEri s-en odedEGimages.son'sWeb

4、nAir[9℄andSpe trum
nformation'sFastlaneeywordsRe oding,DCTDomain,EG,[10℄alsoexist.Theseproxieshavevaryingar hite tureswireless,Webbrowsingand omplexity,anddealwithavaryingnumberoflayersintheproto olsta k.They,however,sharetheir om-monobje tiveofenhan ingtheper eiv

5、edusabilityofslow1.
ntrodu tionwirelesslinks.Usingimagere odingtoenhan e ompres-sion anbeonemethodtorea hthisobje tive.Apartfromin urringaslightredu tioninimagequal-Wirelessnetworksareusedto onne ttothe
nternetityfortheuser,imagere oding onsumespro essingtimeatanin re

6、asingrate.Amajoruseforthe
nternetisattheproxyserverwhi histoperformthere oding.ForWebbrowsingandmostofthedatatransmittedwhens alabilityreasonsitisimportantthatthisre odingisasbrowsingtheWebisimagedata.Thismakese iente ientaspossible.roxies apableofimagere odingtran

7、smissionofimagesoverslowwirelesslinksimportant.oftenusesomegeneralimage onversionprogramtoper-Currently,imagedataontheWebisusually odedinformthere oding.Thispaperdes ribesane ientDCTtheformatsG
F[1℄orEG[2℄,withEGbeingthedomainre oderfo usingonenhan ingtheperforma

8、n epredominantformatforlargerimages.G
FandEGofWebproxies.Theperforman emeasurementsshowuse ompressionalgorithmstoredu ethe