基于单目视频流的前方车辆检测算法-研究

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1、杭州电子科技大学硕士学位论文ABSTRACTMonocularvisionbaseddetectionsystemforfront-viewvehicleisasystemwhichaimingtoalertdriversbydetectfront-viewvehiclecorrectlyandrapidly.Withthedevelopmentofmachinevisiontechnology,thedetectionsystemiswidelyusedinthefieldsofautomateddrivingandintelligenttransp

2、ortation.Majorproblemsofthissystemarefeatureextractionandhypothesisverification.Basedontheanalysisandcompareoftheresearchsituationathomeandabroad,thispaperputforwardnewalgorithmaboutfeatureextractionandhypothesisverification.Theresearchcontentsareasfollows:(1)Ashadowfeatureextra

3、ctionalgorithmbasedonshadowlinescanningandframereduceimagefilteringisproposedbythispaperagainstmissingvehicleeasilyduringthefeatureextractionphase.Usingtheshadowareaundervehicleasthepriorifeaturewhichextractedinthisstage,thealgorithminthispagerextractshadowfeaturesandzoneaboveit

4、whichmaycontainsvehiclebyfuseafewofshadowlineswhichlocateinsameshadowarea.Becauseofthecharacteroftheshadowlineitself,thisalgorithmhassomeadvantagessuchasadaptabletoenvironment,highreal-timeperformanceandfairlylowmissingrate.Butitgetshighfalsealarmrateandwasteprocessingtime.Inord

5、ertoensurethereal-timeperformanceofsystem,theresultsetisfilteredbyframe-reduceimagesothatmostoffalsealarmcouldbeeliminated.Theexperimentverifiedthatthisalgorithmcanreducethemisdetectionratesharply.(2)Toincreasethealgorithm’stheaccuracyandreal-timeperformance,thispaperproposesave

6、rificationalgorithmicframeworkwhichbasedonvotingsystem.Afterextractingthepreliminaryvehicleinformationinscenebyfeatureextractionalgorithm,systemvotesoncandidateareadetectionthroughasetofsimplealgorithmsjustlikepositionestimation,shadowareadetection,symmetrytestandhistoryinformat

7、ion.Thenthealgorithmclassifiesthosecandidatesbythevotingresult.Thevotingsystemreducesthesizeofdatasetwhichtheverificationalgorithmneedstodealandimprovesthesystem'sreal-timeability.Becauseafewofmethodarecollaboratingtovotingsystem,thesystemismorepreciseforthosevehicleswhichlocate

8、onthesideoftheimage.(3)Tosolvingtheproblemthatt