Dynamic Active Contours for Visual Tracking

Dynamic Active Contours for Visual Tracking

ID:39369054

大小:1.06 MB

页数:18页

时间:2019-07-01

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1、562IEEETRANSACTIONSONAUTOMATICCONTROL,VOL.51,NO.4,APRIL2006DynamicActiveContoursforVisualTrackingMarcNiethammer,AllenTannenbaum,andSigurdAngenentAbstract—Visualtrackingusingactivecontoursisusuallysetinorourenvironment(e.g.,controllingthemovementofaplane,ast

2、aticframework.Theactivecontourtrackstheobjectofinterestbasedonvisualinput).Thelatterwillmostlikelyencompasstheinagivenframeofanimagesequence.Asubsequentpredictionfirst(possiblyresultinginnestedcontrolloops).Bothtaskscanstepensuresgoodinitialplacementforthene

3、xtframe.Thisap-beaccomplishedbymeansoffeedbackmechanisms.Ineitherproachisunnatural;thecurveevolutiongetsdecoupledfromtheactualdynamicsoftheobjectstobetracked.Truedynamicalap-caseweneedagoodestimateofobjectposition.Oncewehaveproachesexist,allbeingmarkerparti

4、clebasedandthuspronetothisestimation,weeitherhavefulfilledourtask(e.g.,forsurveil-theshortcomingsofsuchparticle-basedimplementations.Inpar-lanceapplications),orusethisinformationtocloseacontrolticular,topologicalchangesarenothandlednaturallyinthisframe-loop.

5、Thisbringstomindabroadrangeofapplications.Indeed,work.Thenowclassicallevelsetapproachistailoredforevolutionsbeitformedicalormilitaryuse,theneedforvisualtrackingisofmanifoldsofcodimensionone.However,dynamiccurveevolu-tionisatleastacodimensiontwoproblem.Wepro

6、poseaneffi-ubiquitous.cient,levelsetbasedapproachfordynamiccurveevolution,whichVisualfeedbackcontroldifferssignificantlyfromclassicaladdressestheartificialseparationofsegmentationandpredictioncontrol.Sensorsareimagingdevices(usuallycameras)whichwhileretaininga

7、llthedesirablepropertiesofthelevelsetformu-deliveranabundanceofinformationofwhichonlyafractionlation.Itisbasedonanewenergyminimizationfunctionalwhich,forthefirsttime,putsdynamicsintothegeodesicactivecontourmaybeneededforaspecificcontroltask.Thesensoroutputfra

8、mework.needstobepreprocessedtoextracttherelevantinformationforthetrackingproblem,e.g.,thepositionofanobjecttobefol-IndexTerms—Dynamicactivecontours,geodesicactivecon-tours,levelsetmethods,visualtrackin

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