To identify the "familiar face" or "stranger" status, do the following:

1. Select a photo (1).
   
2. Click the button. 

The search panel (2) will display the probability that the person is a "stranger".

The algorithm is as follows: 

1. The person is compared to all recognized persons in the last 30 days.
2. The number of days (N) in which the person was captured by camera and recognized is calculated.
3. The probability is calculated according to the formula (1−N/30)*100.