News Enterprise Irisbiometry Iris Features Procedure Procedure Speed FAR/FRR Verification Identification Solutions References Products Partners

PROCEDURE

1. Capture

B/W video image is captured:

• Inner and outer boundaries at limbus and pupil are captured
• Contraction and dilatation of pupil are accounted for
• Artifacts (eye lashes, light reflexes, etc.) in the visualization area of the iris are reduced
• Image is oriented in a single plane

2. Iris code is generated

Iris features are converted into the 512 byte iris code. (256 bytes for the features, 256 bytes for control)

3. Code is stored

IrisCode^® is stored in a database or on another token in encrypted format.

4. Recognition

IrisCode^® is compared against all IrisCode^® records in a database or on another token.

5. Result

Decision: "match" or "no-match".
"The decision for "match" or "no-match" is based on the statistical value of the Hamming Distance (HD).

General rules:

if more than 68% of all bits match, it's an Accept.
(more than 68% = HD < 0.32 for up to 18 million users)

if less than 68% of all bits match, it's a Reject.
(less than 68% = HD > 0.32 for up to 18 million users)

0.28 is sufficient to securely identify 84 billion people.