Hand GeometryBy: Kieran Hepworth

Table of Contents Definition...................................Slide 3 How it Works.............................Slides 4 – 6 Equipment.................................Slide 7 Pros...........................................Slide 8 Cons..........................................Slide 9 Use of Hand Geometry..............Slide 10 Video…......................................Slide 11

Definition Hand geometry-a biometric that identifies users

by the shape of their hands. It uses the measurements of the hand in order to

determine if the hand is a match or not. Can use finger length, thickness, and curvature. Only for the purposes of verification, not

identification.

How it Works In a broad sense, hand geometry readers

measure a user's hand along many dimensions and compare those measurements to measurements stored in a file.

This is done by using a series of algorithms to determine the measurements of the hand.

How it Works (cont’d) Assuming that there is already images of the

hand on file, these are the steps taken in hand geometry

Step 1: Hand is placed on plate with hand in right position between 6 pins and an image is taken

Step 2: A median filter is applied to the image Step 3: Necessary features for comparison are

extracted

How it Works (cont’d) Step 4: Difference between sample and

template is calculated for each feature Step 5: Person with smallest “absolute

difference” in feature is identified Step 6: Step 5 is repeated for all 5 features Step 7: Person with largest number of

features is identified as a match Step 8: Results are displayed

Equipment Scanner Pins Screen Punch keys (if desired) Swipe (if desired)

Pros Requires little memory Less invasion of privacy (people more

comfortable with system) Can easily be coupled with other systems

for identification

Cons Not distinctive Can only be used for verification Many hands are very similar in shape and size,

system may confuse someone else’s hand for yours

Would have to be combined with another system in order for complete identification

System can be very expensive Training required

Use of Hand Geometry Hand geometry is widely used throughout the

world It is used for verification, not identification The hand geometry system is coupled with ID

scanning to verify who is entering It is not widely used in airports but has been taken

advantage of by different companies for their buildings and even government agencies

Video http://video.search.yahoo.com/video/play?n

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