algorithm of pretreatment on automobile body point cloud

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1、CHINESEJOURNALOFMECHANICALENGINEERINGGAOFengZHOUYuDUFarongQUWeiweiXIONGYonghuaDepartmentofAutomobileEngineering,BeihangUniversity,Beijing,ChinaALGORITHMOFPRETREATMENTONAUTOMOBILEBODYPOINTCLOUD*Abstract:Aspointcloudofonewholevehiclebodyhasthetraitsoflargegeo

2、metricdimension,hugedataandrigorousreverseprecision,onepretreatmentalgorithmonautomobilebodypointcloudisputforward.Thebasicideaoftheregistrationalgorithmbasedontheskeletonpointsistoconstructtheskeletonpointsofthewholevehiclemodelandthemarkpointsoftheseparatep

3、ointcloud,tosearchthemappedrelationshipbetweenskeletonpointsandmarkpointsusingcongruencetrianglemethodandtomatchthewholevehiclepointcloudusingtheimprovediterativeclosedpoint(ICP)algorithm.Thedatareductionalgorithm,basedonaveragesquarerootofdistance,condensesd

4、atabythreesteps,computingdatasets'averagesquarerootofdistanceiniw.^pling:cube£rd,sortingorderaccordingtothevaluecomputedfromthefirststop,choosingsamplingpercentage.Tfeaccuracyofthetwoalgorithmsaboveisprovedbyaregistrationandreductionexiuvpleofwholevehiclepoi

5、ntcloudofacertainlighttruck.Keyvoros:Reverst;engineeringPaintcloudregistrationSkeletonpointiterativeclosedpoint(ICP)Datareduction0INTRODUCTIONInreverseengineeringsystem,thepointcloudregistrationandthedatareductionaretwocrucialcruxesofthepointcloudpretreatment

6、.Theprecisionofregistrationandqualityofreductioncanaffecttheoutcomeofsurfacereconstructionsignificantly.Thehypostasisofpointcloudregistrationistofindpropermappingrelationamongseveralpreparativeregistrationpointcloudsandachieveiterativesolutionbycoordinatetra

7、nsforming.Thetraditionalregistrationalgorithmismainlydividedintotwocategories:thegeometrymatchingalgorithmandthepinpointregistrationalgorithm.Geometrymatchingalgorithm,suchaslabelmatchingalgorithm11'andmaximumlikelihoodregistrationalgorithm'21,constructsthema

8、ppingrelationamongpointcloudbyusingthetopologygeometrycharacterofpointcloudortriangles.Pinpointregistrationalgorithmmainlydependsonnumericalanalysissuchasinterativeclosedpoint(ICP)algori