| CPC H04N 21/44218 (2013.01) [G06V 40/10 (2022.01); G06V 40/161 (2022.01); H04H 60/33 (2013.01); H04H 60/37 (2013.01); H04H 60/45 (2013.01); H04H 60/46 (2013.01); H04H 60/66 (2013.01); H04N 21/251 (2013.01); H04N 21/25866 (2013.01); H04N 21/4223 (2013.01); H04N 21/4826 (2013.01); H04N 21/6582 (2013.01); H04H 2201/30 (2013.01); H04H 2201/37 (2013.01)] | 21 Claims |

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1. A method comprising:
on a client system having one or more processors, and memory storing one or more programs for execution by the one or more processors:
displaying, on a display of the client system, media content;
capturing visual data in a vicinity of the client system:
determining that an object included in the visual data is a facial image of a user based on analyzing the visual data:
determining that the user is in the vicinity of the client system displaying the media content based on periodically capturing and analyzing the visual data in the vicinity of the client system;
determining that the facial image of the user is for an individual who is not enrolled in a media viewership study for measuring viewership of the media content;
transmitting, to a server system, presence information of the user indicating that the user is in the vicinity of the client system displaying the media content, the server system including the user in a total count statistic for the media content in the media viewership study;
retaining the facial image of the user during the displaying of the media content; and
removing the facial image of the user at an end of the displaying of the media content.
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