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　　Asmotivatedbytheextensivepotentialapplicationsinpublicsecurity，financialsecurity，human-computerinteraction，biometricsrecognitionespeciallyfacerecognitionhasbecomeoneofthehottopicsinthefieldsofpatternrecognitionandartificialintelligence.Thisbookmainlyfocusesonfeatureextractionandclassificationalgorithmsundercomplexconditions，anditsobjectiveisthatthereaderscanquicklyunderstandthelatestfeatureextractionandclassificationmethods.Themaincontentsofthebookareasfollows：imagesynthesisandclassificationmethodbasedonquotientimagetheory;aclassificationmethodbasedonreconstructionerrorandnormalizeddistance;facerecognitionmethodbasedontheoriginalandapproximatefaceimages;enhancedcollaborativerepresentationbasedclassification;approximateandcompetitiverepresentationmethod;akerneltwo-phasetestsamplesparserepresentationmethod;quaternion-basedmaximummargincriterionmethod.《BR》Thisbookcanbeusedforpostgraduatesandseniorundergraduatesmajoredincontrolscienceandengineering.Meanwhile，itisalsoaquiteusefulreferencebookfortheresearchersintherelatedfields.