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NewestupdateisversionOpenSourceandfreeAvailableforC,C++,andPythonFirstweimporttheOpenCVlibrarycv2andgiveittheshortcutcv importcv2ascvThenweloadanimagefromthecurrentfolderwiththefunctionanddisplayitwiththefunctioncv.OpenCVisanImageProcessinglibrarycreated byIntelandmaintainedbyWillowGarageItisfreelyavailableforcommercialaswellasacademicpurposesvoidcv::hal::resize(intsrctype:constuchar*: srcdata:sizetsrcstep:intsrcwidth:intsrcheight:uchar*:dstdata:sizetdststep:intOpenCVisalibraryforimageprocessingThedocumentdescribesthe so-calledOpenCVxAPI,whichisessentiallyaC++API,asoppositetotheC-basedOpenCVxAPIThelatterisdescribedinOpenCV(OpenSource ComputerVisionLibrary:)isanopen-sourcelibrarythatincludesseveralhundredsofcomputervisionalgorithmshighguiGUIfunctionsIntroductionEasytouse andinstallifnamein(function):match (function)returnmatchlistWestartthistutorialbyopeningafileanddisplayingitinawindowThisbookdocumentsa toolkit,OpenCV,thatallowsthereadertodointerestingandfunthingsrapidlyincomputervision.Alltheclassesandfunctionsaredefinedwithinthenamespace. imshowinawindowcalledwindowsearchfunction('blur')Theabovereturnsthefollowinglist:['GaussianBlur','blur','medianBlur']Nowjustappendcvbeforethe functionofyourchoiceandproceedformatextensionjpg,png,tiff)cxcoreDatastructuresandlinearalgebrasupportChapterOpenCVwithpythOnLineUses NumPy’sOpenCVlibrary(sinceversion)isdividedintoseveralmodules,whereeachmodulecanbeunderstood,ingeneral,asbeingdedicatedtoonegroupof computervisionproblemsTochangetheimagetoagrayscaleimageusethisfunction:gray=or(img, BGR2GRAY)importcv2ascvimg=('')('window',img)e('', img)gray=or(img, BGR2GRAY)OpenCV(OpenSourceComputerVisionLibrary:)isanopen-sourceBSD-licensedlibrarythatincludesseveralhundredsof computervisionalgorithmscvIt’scurrentlythelargestcomputervisionlibraryintermsofthesheernumberoffunctionsitholdsTherearemanyalternativesthat haveaC++interface(whichismoreconvenient)andareasefficientasOpenCV.OpenCVcontainsimplementationsofmorethanalgorithms!Easytouseand installOpenCV,orOpenSourceComputerVisionlibrary,startedoutasaresearchprojectatIntelNewestupdateisversionOpenSourceandfree cvauxAuxiliary(experimental)OpenCVfunctionsItgivesanintuitiveunderstandingastohowthealgorithmswork,whichservestoguidethereaderindesigning anddebuggingvisionVectorsareobtainedinOpenCVasmatriceshavingoneoftheirdimensionsasMatricesare7OpticalFlow:OverviewGivenasetofpoints inanimage,findthosesamepointsinanotherimageSpecifically,LineDisplaystheobjectdatatypeaslistThedocumentdescribestheso-calledOpenCVxAPI, whichisessentiallyaC++API,asopposedtotheC-basedOpenCVxAPI(CAPIisdeprecatedandnottestedwith"C"compilersinceOpenCV2OpenCV modules:cvMainOpenCVfunctionsor,givenpoint[ux,uy]TinimageIfindthepoint[ux+δx,uy+δy]TinimageIthatminimizesε:(theΣ/w’sareneeded duetotheapertureproblem)Pythonlibraries,understandingkeymodulesandout-of-boxfunctionsforcomputervisionimplementations,andlearningthesyntax forscalingupAvailableforC,C++,andPythonThereforetoaccessIntroductionOpenCVisanImageProcessinglibrarycreatedbyIntelandmaintainedby WillowGarageFM-RTheMatdatatypeTheMatclassrepresentsafixedtypedensen-dimensionalarrayUsedforrepresentingawiderangeofthings:images, transformations,opticalflowmaps,trifocaltensorAMatcanhavemultiplechannelsExample:AxRGBimageGeneral:OpenCVhasaCinterfacetomatrix operationsOpenCVautomaticallyconvertstothedesiredformat