《光流法opencv》PPT课件

《《光流法opencv》PPT课件》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、IntroductiontoOpenCVDavidStavensStanfordArtificialIntelligenceLabAside:HistogramEqualizationImagesarefromWikipedia.Todaywe’llcode:Afullyfunctionalsparseopticalflowalgorithm!PlanOpenCVBasicsWhatisit?Howdoyougetstartedwithit?FeatureFindingandOpticalFlowAbriefmathematicaldiscussion.OpenCVImplementa

2、tionofOpticalFlowStepbystep.WhatisOpenCV?Created/MaintainedbyIntel.Reallyfourlibrariesinone:“CV”–ComputerVisionAlgorithmsAllthevisionalgorithms.“CVAUX”–Experimental/Beta“CXCORE”–LinearAlgebraRawmatrixsupport,etc.“HIGHGUI”–Media/WindowHandlingRead/writeAVIs,windowdisplays,etc.Checkoutthesamplesdi

3、rectory!InstallingOpenCVDownloadfrom:http://sourceforge.net/projects/opencvlibrary/BesuretogetVersion1.0.0.Windowsversioncomeswithaninstaller.Linux:(InstallffMPEGfirst!)gunzipopencv-1.0.0.tar.gz;tar–xvfopencv-1.0.0.tarcdopencv-1.0.0;./configure--prefix=/usr;makemakeinstall[asroot]CopyalltheDLLsi

4、nOpenCVbintoWINDOWSSystem32.TellVisualStudiowheretheincludesare.(ImportaCfilefirst.)TellVisualStudiotolinkagainstcxcore.lib,cv.lib,andhighgui.lib.TellVisualStudiotodisablemanagedextensions.BetterPerformance:ICCandIPLIntelC/C++CompilerIntelIntegratedPerformancePrimitives~30–50%SpeedUpPlanOpen

5、CVBasicsWhatisit?Howdoyougetstartedwithit?FeatureFindingandOpticalFlowAbriefmathematicaldiscussion.OpenCVImplementationofOpticalFlowStepbystep.OpticalFlow:OverviewGivenasetofpointsinanimage,findthosesamepointsinanotherimage.or,givenpoint[ux,uy]TinimageI1findthepoint[ux+δx,uy+δy]TinimageI2thatmin

6、imizesε:(theΣ/w’sareneededduetotheapertureproblem)OpticalFlow:UtilityTrackingpoints(“features”)acrossmultipleimagesisafundamentaloperationinmanycomputervisionapplications:Tofindanobjectfromoneimageinanother.Todeterminehowanobject/cameramoved.Toresolvedepthfromasinglecamera.Veryusefulforthe223bco

7、mpetition.Determinemotion.Estimatespeed.Butwhataregoodfeaturestotrack?FindingFeatures:OverviewIntuitively,agoodfeatureneedsatleast:Texture(orambiguityintracking)Corner(orapertureproblem)Butwhatdoesthismeanformally?Shi/Tomasi