结构光3D扫描原理课件-经典必看.ppt
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结构光3D扫描原理课件-经典必看.ppt
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ComputerVision,Spring201915-385,-685Instructor:
S.NarasimhanWean5403T-R3:
00pm4:
20pmLecture#17,StructuredLight+RangeImagingLecture#17,(ThankstoSlidesfromLevoy,Rusinkiewicz,Bouguet,Perona),3DScanning,StructuredLightReconstruction,AvoidproblemsduetocorrespondenceAvoidproblemsduetosurfaceappearanceMuchmoreaccurateVerypopularinindustrialsettingsReading:
MarcLevoyswebpages(Stanford)KatsuIkeuchiswebpages(UTokyo)PeterAllenswebpages(Columbia),StereoTriangulation,I,J,Correspondenceishard!
I,J,StructuredLightTriangulation,Correspondencebecomeseasier!
StructuredLight,Anyspatio-temporalpatternoflightprojectedonasurface(orvolume).Cleverlyilluminatethescenetoextractsceneproperties(eg.,3D).Avoidsproblemsof3Destimationinsceneswithcomplextexture/BRDFs.Verypopularinvisionandsuccessfulinindustrialapplications(partsassembly,inspection,etc).,LightStripeScanningSingleStripe,Camera,Source,Surface,Lightplane,OpticaltriangulationProjectasinglestripeoflaserlightScanitacrossthesurfaceoftheobjectThisisaverypreciseversionofstructuredlightscanningGoodforhighresolution3D,butneedsmanyimagesandtakestime,Triangulation,Projectlaserstripeontoobject,Object,LightPlane,Triangulation,Depthfromray-planetriangulation:
Intersectcameraraywithlightplane,Laser,Object,LightPlane,ImagePoint,Example:
Laserscanner,Cyberwarefaceandheadscanner,+veryaccurate0.01mmmorethan10secperscan,DigitalMichelangeloProjectgraphics.stanford.edu/projects/mich/,Example:
Laserscanner,Portable3Dlaserscanner(thisonebyMinolta),FasterAcquisition?
ProjectmultiplestripessimultaneouslyCorrespondenceproblem:
whichstripeiswhich?
Commontypesofpatterns:
BinarycodedlightstripingGray/colorcodedlightstriping,BinaryCoding,Pattern1,Pattern2,Pattern3,Projectedovertime,Example:
3binary-encodedpatternswhichallowsthemeasuringsurfacetobedividedin8sub-regions,Faster:
stripesinimages.,BinaryCoding,AssigneachstripeauniqueilluminationcodeovertimePosdamer82,Space,Time,BinaryCoding,Pattern1,Pattern2,Pattern3,Projectedovertime,Example:
7binarypatternsproposedbyPosdamer&Altschuler,Codewordofthispxel:
1010010identifiesthecorrespondingpatternstripe,Morecomplexpatterns,Zhangetal,Worksdespitecomplexappearances,Worksinreal-timeandondynamicscenes,Needveryfewimages(oneortwo).Butneedsamorecomplexcorrespondencealgorithm,ContinuumofTriangulationMethods,Slow,robust,Fast,fragile,3DAcquisitionfromShadows,Bouguet-Perona,ICCV98,3DModelAcquisitionPipeline,3DScanner,3DModelAcquisitionPipeline,3DScanner,3DModelAcquisitionPipeline,3DScanner,3DModelAcquisitionPipeline,3DScanner,3DModelAcquisitionPipeline,3DScanner,3DModelAcquisitionPipeline,3DScanner,Real-Time3DModelAcquisition,NextClass,PolyhedralObjectsandLineDrawingReadingNotes,
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- 结构 扫描 原理 课件 经典