Appendix C: Minimising Incorrect Matches

If you want to take every measure possible to minimise the chances of incorrect matches (aka ‘false positives’) in the future, and you are happy to live with a lower recognition rate, you should adjust your facial recognition settings (on each iPad running the NoahFace App) as follows:

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The settings to focus on are:

• The Detection Distance is set to Very Near, which means you have to stand very close to the iPad.
• The Detection Threshold is set to High, which means the image must be extremely clear before face comparisons are attempted.
• The Matching Threshold is set to Maximum, meaning the system must be extremely confident that two faces are identical before declaring a match.
• Biometric Learning has been configured to only take place during registration.

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To be absolutely clear: even these settings cannot eliminate the possibility of an incorrect match, it just makes it much less likely than with the default settings. If you cannot accept this in your environment, you should consider using two-factor authentication.

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