Using appropriate input device it will collect the data of the person’s
biological features. These features are known as the master key for
the computer.
Let us put in a simple manner.
For recording and converting biometric traits to usable computer data, one needs an appropriate sensor (see table). Of course, costs can greatly vary for different sensors. However, we can't forget that many technical devices already have sensors built in, and therefore, offer possibilities to measure biometric features nearly free of cost.
Biometric Trait Sensor
Fingerprint (Minutia) capacitive, optic, thermal, acoustic, pressure sensitive
Signature (dynamic) Tablet
Facial Structure Camera
Iris pattern Camera
Retina Camera
Hand geometry Camera
Finger geometry Camera
Vein structure of the back of the Hand Camera
Ear form Camera
Voice (Timbre) Microphone
DNA Chemical Lab
Odor Chemical sensors
Keyboard Strokes Keyboard
Comparison: Password Keyboard
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