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1、1ToC.A.RosenandC.W.Stork2PrefaceurpurposesinwritingthisSecondEdition
2、morethanaquartercenturyaf-Otertheoriginal
3、remainthesame:togiveasystematicaccountofthemajortopicsinpatternrecognition,basedwheneverpossibleonfundamentalprinciples.Webelievethatthisprovidesth
4、erequiredfoundationforsolvingproblemsinmorespe-cializedapplicationareassuchasspeechrecognition,opticalcharacterrecognition,signalanalysis,andsoon.Since1973,therehasbeenanimmensewealthofe®ort,andinmanycasesprogress,onthetopicsweaddressedintheFirstEdition.Thep
5、aceofprogressinalgorithmsforlearningandpatternrecognitionhasbeenexceededonlybytheimprovementsincomputerhardware.SomeoftheoutstandingproblemsacknowledgedintheFirstEditionhavebeensolved,whereasothersremainasfrus-tratingasever.Takenwiththemanifestusefulnessofpa
6、tternrecognition,thismakesthe¯eldextremelyvigorousandexciting.Whilewewrotethenthatpatternrecognitionmightappeartobearatherspecial-izedtopic,itisnowabundantlyclearthatpatternrecognitionisanimmenselybroadsubject,withapplicationsin¯eldsasdiverseasspeechrecognit
7、ion,opticalcharacterrecognition,handwritingandgesturerecognition,lipreading,geologicalanalysis,doc-umentsearchingandtherecognitionofbubblechambertracksinelementaryparticleaccelerators;itcentraltoahostofman-machineinterfaceproblems,suchaspen-basedcomputing.Th
8、esizeofthecurrentvolume(whichprecludedmaterialonsceneanalysis,includedinthe¯rstedition)isatestamenttothebodyofestablishedthe-ory.Whereasweexpectmostofourreaderswillbeinterestedindevelopingpatternrecognitionsystems,perhapsafewwillbeactiveinunderstandingexisti
9、ngpatternrecognitionsystems,mostnotablyhumanandanimalnervoussystems.Toaddressthebiologicalrootsofpatternrecognitionwouldofcoursebebeyondthescopeofthisbook.Nevertheless,asneurobiologistsandpsychologistsinterestedinpatternrecognitioninthenaturalworldcontinueto
10、relyonmoreadvancedmathematicsandtheory,theytoomaypro¯tfromthematerialpresentedhere.Despitetheexistenceofanumberofexcellentbooksthatfocusonasmallsetofspeci¯ctechniques,wefeelthereisstillastrongne
