Seite - 155 - in Document Image Processing

J. Imaging 2018,4, 39 Figure5.OutputwordimagesofModifiedlog-Gaborfilter transformonasamplehandwrittenBangla wordimage(shownonleft-side) for5different scalesand6differentorientations (thefirst rowshows theoutput forno=00 andfivescales, thesecondrowshowstheoutput forno=300 andfivescales andsoon). 3.ClassifierCombination Classifiercombinationtries to improveonthe taskofpatternrecognitionperformance through mathematicalmodels. Theoutputsofclassifierscanberepresentedasvectorsofnumberswhere the dimensionofvectors isequal to thenumberofclasses.Asaresult, thecombinationproblemcanbe definedasaproblemoffindingthecombinationfunctionacceptingN-dimensional scorevectors from Mclassifiers andoutputtingNfinal classification scores (seeFigure6),where the function tries to minimize themisclassificationcost. Figure6.Classifiercombinationtakesasetofsji scoreforclass ibyclassifier jandproducescombination scoresSi foreachclass i [34]. 155