Patient video monitoring systems and methods having detection algorithm recovery from changes in illumination

Patent metadata

Field	Value
Publication number	US-2020228757-A1
Application number	US-202016836094-A
Country	US
Kind code	A1
Filing date	Mar 31, 2020
Priority date	Jan 18, 2013
Publication date	Jul 16, 2020
Grant date	—

Abstract

Various embodiments concern video patient monitoring with detection zones. Various embodiments can comprise a camera, a user interface, and a computing system. The computing system can be configured to perform various steps based on reception of a frame from the camera, including: calculate a background luminance of the frame; monitor for a luminance change of a zone as compared to one or more previous frames, the luminance change indicative of patient motion in the zone; and compare the background luminance to an aggregate background luminance, the aggregate background luminance based on the plurality of frames. If the background luminance changed by more than a predetermined amount, then the aggregate background luminance can be set to the background luminance, luminance information of the previous frames can be disregarded, and motion detection can be disregarded.

First claim

What is claimed is:

1 . A system for monitoring a patient in a patient area having one or more detection zones, the system comprising:
a computing system that receives a chronological series of frames from a camera and performs the following steps based on the reception of each frame of the chronological series:
calculate a current background luminance of a current frame;
calculate an aggregate background luminance based on a respective background luminance for each of 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 each luminance value of each pixel within 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;
compare the current background luminance of the current frame to an aggregate background luminance;
in response to the current background luminance changing relative to the aggregate background luminance by more than a predetermined amount, disregard detected patient motion based on the current background luminance changing relative to the aggregate background luminance by more than the predetermined amount, and set the previous zone luminance to the zone luminance in subsequent detection for patient motion; and
in response to patient motion being detected, generate an alert with a user interface in response to the current background luminance changing relative to the aggregate background luminance by less than the predetermined amount.

2 . The system of claim 1 , wherein the computing system detects patient motion according to distinctive rules for each of the one or more zones.

3 . The system of claim 2 , wherein the distinctive rules include a fall alert for given ones of the one or more zones corresponding to where a patient is likely to fall.

4 . The system of claim 2 , wherein the distinctive rules include disarming of patient motion detection in given ones of the one or more zones corresponding to visitors.

5 . The system of claim 1 , wherein the previous zone luminance of a previous frame comprises a historical zone luminance.

6 . The system of claim 1 , wherein the predetermined amount comprises a dynamic threshold amount that changes based on the current background luminance or a background luminance of at least one of the plurality of previous frames.

7 . A system for monitoring a patient in a patient area having one or more detection zones, the system comprising:
a computing system that receives a chronological series of frames and performs the following steps based on the reception of each frame of the chronological series:
calculate a current background luminance of a current frame;
for each zone of one or more zones of the current frame, monitor for a zone luminance change of the zone as compared to one or more frames of a plurality of frames that were previously received from a camera, the zone luminance change indicative of patient motion in the zone of the current frame;
compare the current background luminance of the current frame to an aggregate background luminance; and
in response to the comparison determining that the current background luminance changed relative to the aggregate background luminance by more than a predetermined amount, disregard the zone luminance change as being indicative of patient motion in the zone of the current frame based on the comparison determining that the current background luminance changed relative to the aggregate background luminance by more than the predetermined amount, and monitor for the zone luminance change of each zone of the one or more zones of the next frame as compared to the current frame.

8 . The system of claim 7 , wherein the computing system generates an alert in response to the monitoring step identifying the zone luminance change in the one or more zones of the current frame.

9 . The system of claim 7 , wherein the computing system monitor for the zone luminance change according to distinctive rules for each of the one or more zones.

10 . The system of claim 9 , wherein the distinctive rules include a fall alert for given ones of the one or more zones corresponding to where a patient is likely to fall.

11 . The system of claim 9 , wherein the distinctive rules include disarming of patient motion detection in given ones of the one or more zones corresponding to visitors.

12 . The system of claim 7 , wherein the one or more frames of a plurality of frames comprises a historical zone luminance.

13 . The system of claim 7 , wherein the predetermined amount comprises a dynamic threshold amount that changes based on the current background luminance or a background luminance of at least one of the plurality of previous frames.

14 . A method for processing a chronological series of frames generated by a camera to monitor a patient in a patient area having one or more detection zones by performing the following steps based on the generation of each frame in the chronological series, each step performed at least in part by a computing system:
calculating a current background luminance of a current frame; for each zone of one or more zones of the current frame, monitoring for a zone luminance change of the zone as compared to one or more frames of a plurality of frames that were previously received from the camera, the zone luminance change indicative of patient motion in the zone of the current frame; comparing the current background luminance of the current frame to an aggregate background luminance; and in response to the comparison determining that the current background luminance changed relative to the aggregate background luminance by more than a threshold amount, disregarding the zone luminance change as being indicative of patient motion in the zone of the current frame based on the comparison determining that the current background luminance changed relative to the aggregate background luminance by more than the threshold amount, and monitoring for the zone luminance change of each zone of the one or more zones of the next frame as compared to the current frame.

15 . The method of claim 14 , further comprising generating an alert with a user interface in response to the monitoring step identifying the zone luminance change in the one or more zones of the current frame.

16 . The method of claim 15 , wherein monitoring for the zone luminance change further comprising monitoring for the zone luminance change according to distinctive rules for each of the one or more zones.

17 . The method of claim 16 , wherein the distinctive rules include a fall alert for given ones of the one or more zones corresponding to where a patient is likely to fall.

18 . The method of claim 16 , wherein the distinctive rules include disarming of patient motion detection in given ones of the one or more zones corresponding to visitors.

19 . The method of claim 14 , wherein the one or more frames of a plurality of frames comprises a historical zone luminance.

20 . The method of claim 14 , wherein the predetermined amount comprises a dynamic threshold amount that changes based on the current background luminance or a background luminance of at least one of the plurality of previous frames.

Assignees

• Careview Comm Inc

Inventors

• Clark Matthew Cameron
• Del Carpio Derek

Classifications

• H04N7/183 Primary

  for receiving images from a single remote source · CPC title

• A61B2560/0242

  adapted to measure environmental factors, e.g. temperature, pollution · CPC title

• G08B21/0476

  Cameras to detect unsafe condition, e.g. video cameras · CPC title

• G08B21/0461

  integrated or attached to an item closely associated with the person but not worn by the person, e.g. chair, walking stick, bed sensor · CPC title

• A61B5/1128

  using image analysis (A61B5/1127 takes precedence) · CPC title