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

Claim 19:
20. A tangible, non-transitory, computer-readable medium storing program instructions that cause a first device to execute a process comprising:
identifying, by the first device, a region of interest in video in which a light source of a second 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 second device;

detecting, by the first device, a message within the region of interest transmitted by the second device via its light source; and
providing, by the first device, the message for review by a user.