Tactical Information Systems
Biometric Identification Software

Biometric Modalities

Biometrics 101

Biometric modalities describe types of measurement. The modalities are broken into two categories: physiological and behavioral. Physiological biometrics are things like the image of an iris, face or the pattern of the ridges on the fingers. Behavioral biometrics are things like a signature, the way an individual types or walks. The most common biometric modality is the fingerprint, which has actually been used for identification since ancient Babylon.

Iris image, face image and fingerprint - the most common biometric modalities.

Iris image, face image and fingerprint - the most common biometric modalities.

Other common biometrics are the iris (colored part of the eye) and face. These three constitute the vast majority of biometrics used in practice. Other biometrics include voice, how a person walks, retina, hand geometry, ear shape, heartbeat, typing style and even smell. It turns out that humans are full of unique things. This is the result of random variations in genetics and the womb. Identical twins even have unique biometrics!