Patent ID: 11935299
Assignee: CISCO TECHNOLOGY, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. An apparatus, comprising:
one or more network interfaces;
a processor coupled to the one or more network interfaces and configured to execute one or more processes; and
a memory configured to store a process that is executable by the processor, the process when executed configured to:
identify a region of interest in video in which a light source of a device is present by:
using a current frame of the video and a prior frame of the video to compute a difference frame,
performing thresholding on the current frame to form a threshold frame, and
performing pixel-wise conjunction operations by applying a logical AND operation on a pixel-wise basis between the difference frame and the threshold frame, to identify a centroid of the light source of the device;

detect a message within the region of interest transmitted by the device via its light source; and
provide the message for review by a user.