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Most biometric detection systems use the following four processes:
1. Capture - a physical or behavioral sample is captured by the system using a sensor (camera). In mobile phones the sensor used is the front facing camera for obvious reasons.
2. Extraction - unique data is extracted from the sample (human face) and a template is created. The unique features include but not limited to the following:
• Distance between the eyes
• Width of the nose
• Depth of the eye sockets
• The shape of the cheekbones
• The length of the jaw line
These features were selected because they are easily distinguished by the facial recognition system, when combining these features they create a sample unique for each human.
3. Comparison - the template which is stored in the system is then compared with a new sample captured by the sensor (camera).
4. Matching - the system then decides if the features extracted from the new sample are matching or not. If they do match, the facial recognition was successful and the user will gain access to the phone for example. However, if it is not matching, access will be denied.
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