US 12,277,773 B2
Active presence detection with depth sensing
Kuntal Sengupta, Winchester, MA (US)
Assigned to IMPRIVATA, INC., Lexington, MA (US)
Filed by Kuntal Sengupta, Winchester, MA (US)
Filed on Sep. 6, 2023, as Appl. No. 18/242,707.
Application 18/242,707 is a continuation of application No. 15/836,238, filed on Dec. 8, 2017, granted, now 11,798,283.
Application 15/836,238 is a continuation of application No. 13/920,613, filed on Jun. 18, 2013, granted, now 10,002,297, issued on Jun. 19, 2018.
Claims priority of provisional application 61/715,515, filed on Oct. 18, 2012.
Claims priority of provisional application 61/661,926, filed on Jun. 20, 2012.
Prior Publication US 2024/0020980 A1, Jan. 18, 2024
Int. Cl. G06V 20/52 (2022.01); G06F 21/31 (2013.01); G06F 21/32 (2013.01); G06F 21/83 (2013.01)
CPC G06V 20/52 (2022.01) [G06F 21/316 (2013.01); G06F 21/32 (2013.01); G06F 21/83 (2013.01); G06F 2221/2111 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method for monitoring use of a secure system, the method comprising:
defining a detection zone extending from an operator terminal of the secure system to a depth boundary spaced apart from the operator terminal and corresponding to a distance from the operator terminal beyond which an operator cannot interact with the secure system;
detecting one or more operators associated with the secure system;
for each of the operators, (i) authenticating the operator and initiating a session for the operator on the operator terminal, (ii) detecting a walk-away event of the operator using a depth-sensing camera system co-located with the operator terminal based on the operator being detected beyond the depth boundary, and (iii) responsive to the walk-away event is being detected, starting a re-entry timer associated with the operator;
upon expiration of the re-entry timer associated with a respective operator, closing the session of the respective operator and logging the respective operator out of the secure system;
detecting a face within the detection zone using the depth-sensing camera system;
determining that the face corresponds to the respective operator; and
when the re-entry timer associated with the respective operator has not expired and the detected face corresponds to the respective operator, re-validating the session for the respective operator on the operator terminal without requiring additional authentication.