VideoMotionCapture视频运动捕获

《VideoMotionCapture视频运动捕获》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、VideoMotionCaptureChristophBreglerJitendraMalikUCBerkley19973/5/2002PhillipSaltzmanOverviewChallengesReviewMethodResultsConclusions3/5/2002PhillipSaltzmanChallengesHighAccuracyFrequentInter-partOcclusionLowContrast3/5/2002PhillipSaltzmanReview3/5/2002PhillipSaltzmanReviewMotioncaptureonsynthetic

2、imagesO’RoukeandBalder,19801DOFmarkerfreetrackingHogg,1983.Rohr,1993HigherDOFfullbodytrackingGravrilaandDavis,19953/5/2002PhillipSaltzmanReviewAboutthepreviousworkAllincontrolledenvironmentswithhighcontrastandclearedgebounriesMostuseskintightsuitsormarkersCameracalibrationneeded3/5/2002PhillipSa

3、ltzmanMethod3/5/2002PhillipSaltzmanMethodBasicAssumptionsFromframetoframe,allintensitypixelintensitychangesarelocal:uismotionmodelandiswrittenasamatrixequation:3/5/2002PhillipSaltzmanMethodFindingGradientsGradientformofthefirstequation:FindaleastsquaressolutiontofWarpimageI(t+1)basedonfFindnewgr

4、adientsRepeattominimize3/5/2002PhillipSaltzmanMethodMotionastwistsStandardposematrixtomovefromobjectspacetocameraspace(3D)ScaledorthographicprojectionmovestoimagespaceRequiresknowingsomethingaboutthe3Dmodeloftheimage.Approximatedasellipsoids.3/5/2002PhillipSaltzmanMethodMotionastwistsAnymotionca

5、nberepresentedasarotationaboutanaxis,andatranslationaboutthataxisForexample,tomakethismotion:3/5/2002PhillipSaltzmanMethodMotionastwistsYoumakethismotion:3/5/2002PhillipSaltzmanMethodMotionastwistsTwistscanberepresentedassmallvectorormatrixCanbemadetoaposebyEncodethemotionofapixelbetweentwoframe

6、s3/5/2002PhillipSaltzmanMethodMotionastwistsLinearalgebramanipulationallowsusingthetwistvectortowriteamotionequationforeachpixelThoseequationsareputinavectorandusedtofindaglobalfparameterforthatobject3/5/2002PhillipSaltzmanMethodKinematicchainsBodypartsrepresentedasmultipleconnectedobjectsEachob

7、jectcanbefoundbythetopposeandanangleandtwistforeachobjectdownthechainMorelinearalgebraisusedtofindafforeachbodypart3/5/2002PhillipSaltzmanMethodMultiplecamerasAddsaccuracybecausechangeoffullyoccludedpartsdropwitheachviewNorm