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PATIENT VIDEO MONITORING SYSTEMS AND METHODS HAVING DETECTION ALGORITHM RECOVERY FROM CHANGES IN ILLUMINATION

  • US 20140204207A1
  • Filed: 01/17/2014
  • Published: 07/24/2014
  • Est. Priority Date: 01/18/2013
  • Status: Active Grant
First Claim
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1. A system for monitoring a patient in a patient area having one or more detection zones, the system comprising:

  • a camera;

    a user interface; and

    a computing system configured to receive a chronological series of frames from the camera and perform the following steps based on the reception of each frame of the chronological series;

    calculate a background luminance of the frame;

    calculate an aggregate background luminance based on a respective background luminance for each a plurality of previous frames of the chronological series;

    for each of one or more zones, calculate a zone luminance based at least in part on the background luminance and a plurality of luminance values of a plurality of pixels of the zone;

    for each of one or more zones, detect patient motion based on a change between the zone luminance and a previous zone luminance of a previous frame exceeding a zone threshold;

    compare the background luminance of the frame to an aggregate background luminance;

    if the background luminance changed relative to the aggregate background luminance by more than a predetermined amount, disregard luminance information from the plurality of previous frames when performing the detecting patient motion step and the calculating the aggregate background luminance step for subsequent frames of the chronological series; and

    if patient motion is detected, generate an alert with the user interface if the background luminance changed relative to the aggregate background luminance by less than the predetermined amount but refrain from generating the alert if the background luminance changed relative to the aggregate background luminance by more than the predetermined amount.

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