Iris recognition is an automated method of biometric identification that uses mathematical pattern-recognition techniques on video images of one or both of ...IrisrecognitionFromWikipedia,thefreeencyclopediaJumptonavigationJumptosearchIrisrecognitionbiometricsystemsapplymathematicalpattern-recognitiontechniquestoimagesoftheirisesofanindividual'seyes.Irisrecognitionisanautomatedmethodofbiometricidentificationthatusesmathematicalpattern-recognitiontechniquesonvideoimagesofoneorbothoftheirisesofanindividual'seyes,whosecomplexpatternsareunique,stable,andcanbeseenfromsomedistance.Thediscriminatingpowersofallbiometrictechnologiesdependontheamountofentropy[1]theyareabletoencodeanduseinmatching.Irisrecognitionisexceptionalinthisregard,enablingtheavoidanceof"collisions"(FalseMatches)evenincross-comparisonsacrossmassivepopulations.[2]Itsmajorlimitationisthatimageacquisitionfromdistancesgreaterthanameterortwo,orwithoutcooperation,canbeverydifficult.Retinalscanningisadifferent,ocular-basedbiometrictechnologythatusestheuniquepatternsonaperson'sretinabloodvesselsandisoftenconfusedwithirisrecognition.Irisrecognitionusesvideocameratechnologywithsubtlenearinfraredilluminationtoacquireimagesofthedetail-rich,intricatestructuresoftheiriswhicharevisibleexternally.Digitaltemplatesencodedfromthesepatternsbymathematicalandstatisticalalgorithmsallowtheidentificationofanindividualorsomeonepretendingtobethatindividual.[3]Databasesofenrolledtemplatesaresearchedbymatcherenginesatspeedsmeasuredinthemillionsoftemplatespersecondper(single-core)CPU,andwithremarkablylowfalsematchrates.Atleast1.5billionpersonsaroundtheworld(including1.2billioncitizensofIndia,intheUIDAI/Aadhaarprogramme)havebeenenrolledinirisrecognitionsystemsfornationalID,e-governmentservices,benefitsdistribution,security,andconveniencepurposessuchaspassport-freeautomatedborder-crossings.[4]Akeyadvantageofirisrecognition,besidesitsspeedofmatchinganditsextremeresistancetofalsematches,isthestabilityoftheirisasaninternalandprotected,yet