光学公式识别技术研究

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1、河北大学博士学位论文光学公式识别技术研究姓名：田学东申请学位级别：博士专业：光学工程指导教师：哈明虎20071201AbstractAsaneffectivemeansofautomaticallyinputtingprintedformulasintocomputers，thetechnologyofopticalformularecognitioncanremedythedefectofexistingopticalcharacterrecognitionsystemsthattlleyfailtoproperlyprocessma

2、thematicalformulas，andfurthel"Mvancethedigitalizationofscienceandtechnologydocuments．Uptodate，opticalformularecognitionisstillanunsolvedproblemofcomplextwo-dimensionalpatternrecognitionandanalysis．砸sresearchworkfocusesonitskeytechniques，whichincludeformulasymbolsegmentat

3、ionandrecognition，formulastructureanalysisandformulareconstruction．11圮maincontributionsCanbesummarizedasfollows：1．Tomeetthespecialneedofformularecognition，aformulaimagepre-processingsolutionincludingimagedenoising，binarization，skewanddistortioncorrectionisdesignedandimpl

4、ementedtoimprovetheaccuracyofrecognition．田1eexperimentalresultsshowtheeffectivenessofit．2．Aself-organizingsegmentationalgorithmwithfeedbackmechanismbasedonthehybridstrategiesisproposedtosegmentformulasymbolsarrangedintwodimensions．Itcallmergeorseparatecomponentsandsymbol

5、saccordingtotherecognizingresult．Tosegmenttouchingsymbols，asegmentationmethodofsymboltouchinginverticalisputforwardwhichseparatesthesymbolsintelligentlyonthebasisoftheinductionoftheregularit)，oftouchingsymbols．Andanalgorithmofsegmentingdiagonalorhorizontaltouchingsymbols

6、isdesigned．Meanwhile，aglobalbasedapproachisemployedtoprocessmultipletouchingsymbolswhichappearinformulasfrequentlyasawholeobjectwimacorrespondingfeaturedictionary．砀eexperimentalresultsshowthatthemethodhasahighaccuracy．3．Ajumpingfunctionisdefinedtoexpressformulaimagesanda

7、rapidextractionmethodofdirectionaldementfeaturebasedonthejumpingfunctionisproposedinsymbolrecognition，whichcouldavoidthetimeconsumingoperationofcontourextraction．Besides,arccognizerofformulasymbolsisdesignedbasedonhierarchicalstructure．Thus，bothaccuracyandefficiencyofsym

8、bolrecognitionhavebeenimproved．¨Abstract4．Informulastructuralanalysis，aMaximumMatchingwordsegmentationa