数字视频技术在智能运输系统中的应用研究

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1、⑨秉霸太警博士学位论文数字视频技术在智能运输系统中的应用研究研究生：何铗军导师：黄卫教授专业：道路与铁道工程东南大学交通学院二零零四年五月摘要AbstractWimthedevelopmentofnetworktechnologyandvideocompressionalgorithm．itbecomesanew仃endtOcompressvideointodigitalflowandWansmitthrowIghnetworks．Butthemainstreamproductsofmarketscall

2、notsarisfyneedofATMSbecauseofitsbiglatency，poorvideoqualityandsimplefunction．Thecontentofthisdissertationcanbesummarizedasfollows：1．RealizedaMPEG-2networkCODECsystem．AnembeddedplatformisconstructedusingMCF5307CPUasitscore．Assembletheplatformwithvariousint

3、erfacechips．aMPEG-2networkCODECsystemisrealized．ThedetaileddesignofcircuitsandprogrammingtechniquesofdriversforucLinuxOSisprovidedinthedissertation．2．BasedontheanalysisofdataformatofMPEG-2stream，adissertationdiscussedthefluctuationsinnetworktransmissionan

4、dthetemporaldelayinheritedindigitalvideothoroughly,andbroughtforwardcolTespondingsolutions，whichensuretheplaybacksmoothandlow-delayed，andmakethissystemprecedingthepeers．3．AsthefrequencyresponsepropeaiesoftheCODECsystemprototypecannotsatisfytherequiremento

5、frelatedstandards，twohigh·frequencycompensationalgorithmsbaSedseparatelyonspatialdomainandfrequencydomainareproposed．Inparticular,therealizationofthecompensationalgorithmbasedonspatialdomainisprovided．111eproposedalgorithmsensurethatallthefunctionalperfor

6、mancesoftheCODECsystemareuptograde．4．Theunreliabilityofnetworktransmissioncancauselossofdata．Errorconcealmentisawaytosolvethisproblem．Basedonthecharacteristicsofimagesforhighwaysurveillanceandcontrol，thecorrelationbetweenBframeandtwoneighboringreferencefr

7、amesisusedtoobtainthemotion-vectorvaluesofthelostpart，thenthelostpartisrecoveredwiththecontentofpreviousreferencefranle．ThismechanismCanachievesatisfactoryresults．5．DiscussedthetechnologyofobtainingtrafficdatafromcompressedvideostreaminⅣ田EG-2format．TheDCT

8、coefficientsofgrayscaleandchroma，andthemotionvectorsofmacroblocksareusedtoinspecttheexistenceofvehiclesandmeasuretheirspeed．Comparedtotraditionalvideoinspectors，thisnewmethodhaShighprecisionandstronganti-interferenc