Using The Office 2007 OCR Component in C分析和总结分析和总结.docx

Using The Office 2007 OCR Component in C分析和总结分析和总结.docx

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UsingTheOffice2007OCRComponentinC#

RickLeinecker

Ifyouhaveoffice2007installedonVista,OpticalCharacterRecognition(OCR)isnoweasierthanyouthink.

IrecentlywenttoatrainingseminarinordertolearnhowtouseMicrosoftOffice2007.Itsagreatpackage,butwhatreallyimpressedmywasitscapabilitytoturnimagesintotextwithalmostnoeffort.

ThistechniqueisknownasOpticalCharacterRecognition(OCR),andithasbeenunderdevelopmentfordecades.Finally,itisaccurateandeasytouse.

IveneverincludedOCRcapabilitiesinsoftwareuntilnow.Themainreasonwasbecauseofitsinaccuracy.Itriedseveralpackagesintheearly90s.Aftercarefullyconvertingscannedpagesintotextandthencorrectingtheerrors,Ifoundthatitwasfastertojusttypethecontentthantoconvertandcorrectit.

AnothersmalldetailintheearlydaysofOCRwasthecostofthirdpartylibraries.Mostofthemcameatahighprice,usuallymorethan$500.Forme,knowingthatitwasfairlyinaccurateanyway,thatpricewastoohigh.Ifithadbeeninexpensive,ImighthavebeenwillingtoaddOCRasafeaturetosomeprojectsjustsoIdhaveanothermarketingbulletpoint.

IfyouhaveOffice2007installed,theOCRcomponentisavailableforyoutouse.TheonlydependencythatsaddedtoyoursoftwareisOffice2007.RequiringOffice2007tobeinstalledinorderforyoursoftwaretoworkmayormaynotfitasituation.ButifyourclientcanguaranteethatmachinesthatyoursoftwarewillrunonhaveOffice2007installed,youregold.Iveencounteredmanysituationswherethisisthecase.Iveevenencounteredafewsituationswhere clientswerewillingto installOffice2007inordertousemyapplications.

Oneimportantpoint,though,isthatOffice2003hasitsownOCRcomponent,too.ItsnotasaccurateastheOffice2007version,butworks.TheissueforadeveloperisthattheyaredifferentCOMobjectswithdifferentGUIDs.Ifyouwritesoftw

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