基于字幕的新聞事件檢索應用研究.pdf

1、北方工業(yè)大學碩士學位論文基于字幕的新聞事件檢索應用研究姓名：李燕申請學位級別：碩士專業(yè)：計算機應用技術指導教師：劉文萍20070520北方I：業(yè)人學碩士學位論文ResearchofNewsEventretrievalbasedonCaptionAbstractNewsvideoisoneofthemostimportantmediaforuserstogettheinformationwhicharerelatedtothepeople

2、’SdailylifeItisanurgentdemandformanagingandretrievingtheinterestednewsfromahugeamountofnewsvideodataefficientlyandcorrectlyInnewsvideo，thecaptiousprovidethekeyfortherelatednewsstoryandtheyCanbeusedfortheeffectiveretrieva

3、lThisthesisproposesacaptionbasednewsvideoretrievaltechnique，anddevelopsaprototypesystemfornewseventretrievalTheprototypedsystemconsistsoftwomodules：①newseventsegmentationand②newseventretrievalThenewseventsegmentationmodu

4、leistopartitionthenewsvideointoseveralindividualnewsstoriesbydetectingspecialevents(suchastextevent，anchorpersonshot)Animprovedalgorithmfortexteventdetectionisproposedandananchorpersonshotdetectionalgorithmisdevelopedint

5、histhesisExperimentalresultsdemonstratethattheaccuracyofthetexteventdetectionalgorithmisachieved，andtheanchorpersonshotdetectionalgorithmiseffectiveThenewseventretrievalmoduleistolocateandextractthecaptioninthenewseventT

6、hen，therecognizedtextinformationiSstoredinthedatabaseasindexforusertetrievetherelatednewsInthisthesisedgedetectionandconnectedregionlabeledmethodsaleusedtolocatethecaption，andthenthethresholdsegmentationmethodisUsedtoext

7、ractthecaptionFinallytheChineseopticalcharacterrecognitionsystemdevelopedbyHanWangCompanyisemployedforthesegmentedcharactersrecognitionTheprecisionofthecaptiondetectionishigherthan85％，whiletherecognitionrateisnothighenou