The history of biometric techniques is not new, it trace its origin from the past. The ancient biometric technique which was practiced was a form of finger printing being used in China in the 14th century, as reported by the Portuguese historian Joao de Barros. The Chinese merchants were stamping children's palm and footprints on paper with ink to distinguish the babies from one another. Biometrics the ancient Greek word is the combination of two words -bio means life, metric means measurement.It is the study of methods for uniquely recognizing humans based upon physical or behavioral characterstics. The physiological characterstics are fingerprint, face, hand geometry, DNA and iris recognition. Behavioral are related to the behavior of a person like signature, study of keystroke, voice etc. Thus a biometric system is essentially a pattern recognition system which makes a personal identification by determining the authenticity of a specific physiological or behavioral characteristic possessed by the user. Biometric characteristics are collected using a device called a sensor. These sensors are used to acquire the data needed for verification or identification and to convert the data to a digital code.
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