# Hand Geometry

## Historical Information:

Hand geometry has never been used as a main identifying feature. However, palm readers use it to determine a person's future using palmistry.

## The Use of Hand Geometry in Biometrics:

There is wide public acceptance of hand biometrics since it is not intrusive. However, in most cases, hand geometry can only be used for verification, not identification, since it is not determined whether hands are unique to every human. Hand geometry, in general, costs thousands of dollars.

### Hand Geometry

• Hand geometryis the scanning of the hand's 3-D features, such as the size and shape of the knuckles or fingers. It disregards any scars, cuts, etc.To keep the hand in one uniform position, pegs are used signify the where the area between the fingers should be. During the enrollment process, the system scans the hand for 90 characteristics three times and creates a 9-bit mathematical template which is the average of the three trials. The scanner consists of a light source, a mirror, and a camera, and a scanning surface.
The 1996 Olympic Games used HandKey to protect certain areas of Olympic Village.

HandPunch
This graphic used with the permission of International Biometrics Group.

• Singer finger geometryuses the same concept of hand geometry, except it uses only the index finger. This finger pushes a plunger/button which goes into the device. Rollers, instead of scanners, scan the finger for recognizable characteristics. The rollers take measurements of 12 cross-sections of 1½ part of finger.

• Two fingers geometry is a mix of of hand geometry and singer finger. It uses a scanner, but it only takes measurements of the index and middle finger.

### LiveGrip

Developed by Advanced Biometrics. Unlike the other methods, LiveGrip uses the unique vein patterns of the palm. To use it, the user simply grips something, usually as a door knob. Photo-optics determine the location of the veins beneath the skin. An alogirthim takes the locations and transforms it into an code.