Offline tuning system for detecting new motion zones in a motion detection system

• US 10,565,860 B1
• Filed: 03/21/2019
• Issued: 02/18/2020
• Est. Priority Date: 03/21/2019
• Status: Active Grant

• Current Assignee: Cognitive Systems Corp.
• Original Assignee: Cognitive Systems Corp.
• Inventors: Omer, Mohammad, Devison, Stephen Arnold
• Primary Examiner(s): Yacob, Sisay
• Application Number:
  US16/360,250
• Time in Patent Office: 334 Days
• CPC Class Codes: G01S 13/56 for presence detection presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26
• CPC Class Codes: G01S 7/415 Identification of targets based on measurements of movement associated with the target
• CPC Class Codes: G08B 13/181 using active radiation detection systems
• CPC Class Codes: G08B 13/19 using infrared-radiation detection systems G08B13/194 takes precedence
• CPC Class Codes: G08B 13/19652 Systems using zones in a single scene defined for different treatment, e.g. outer zone gives pre-alarm, inner zone gives alarm
• CPC Class Codes: G08B 13/1968 Interfaces for setting up or customising the system
• CPC Class Codes: G08B 13/19684 Portable terminal, e.g. mobile phone, used for viewing video remotely
• CPC Class Codes: G08B 13/22 Electrical actuation
• CPC Class Codes: G08B 29/24 Self-calibration, e.g. compensating for environmental drift or ageing of components

Abstract

In a general aspect, an offline system detects new motion zones for a motion detection system. In some examples, observed channel response data is obtained from a motion detection system. The observed channel response data is associated with a plurality of subcarriers for each wireless link over a period of time. Estimated channel response data is generated for each wireless link. Transitions between zones of activity are identified in the estimated channel response data for each of the plurality of subcarriers for each wireless link. A new motion zone of the motion detection system is detected based on the estimated channel response data and the identified transitions.

Claims

1. A method comprising:

obtaining observed channel response data from a motion detection system, the observed channel response data based on wireless signals transmitted over a plurality of wireless links in a space, the observed channel response data associated with a plurality of subcarriers for each wireless link over a period of time;

generating estimated channel response data for each of the plurality of subcarriers for each wireless link;

identifying transitions between zones of activity in the estimated channel response data for each of the plurality of subcarriers for each wireless link;

detecting a new motion zone of the motion detection system based on the estimated channel response data and the identified transitions; and

adjusting a number of motion zones in an adaptive model, wherein the number of motion zones is a hyperparameter of the adaptive model.

2. The method of claim 1, wherein each zone of activity corresponds to a segment of a time series of the observed channel response data, and

wherein generating estimated channel response data for each of the plurality of subcarriers for each wireless link comprises generating random data for each of the plurality of subcarriers for each wireless link based on distributions for the zones of activity and hyperparameters corresponding to characteristics of each distribution.

3. The method of claim 2, wherein detecting a new motion zone based on the estimated channel response data and the identified transitions comprises:

analyzing the random data and the transitions identified between each zone of activity;

adjusting the hyperparameters corresponding to characteristics of each distribution and re-generating the random data using the adjusted hyperparameters;

determining whether the random data correlates to the observed channel response data;

in response to determining the random data correlates to the observed channel response data, aggregating the identified transitions for each of the plurality of subcarriers for each wireless link; and

determining at least one of the identified transitions indicates a new motion zone.

4. The method of claim 3, comprising, in response to determining the random data does not correlate to the observed channel response data, adjusting the hyperparameters corresponding to characteristics of each distribution and re-generating the random data using the adjusted hyperparameters until the random data correlates to the observed channel response data.

5. The method of claim 3, comprising generating a time vector that indicates the transitions identified between the zones of activity in the estimated channel response data for each of the plurality of subcarriers for each wireless link.

6. The method of claim 1, comprising:

providing, to a user device associated with the motion detection system, a notification indicating the new motion zone; and

in response to the notification, receiving, from the user device, a confirmation of the new motion zone or a rejection of the new motion zone.

7. The method of claim 6, wherein the confirmation of the new motion zone comprises a label for the new motion zone provided by a user.

8. The method of claim 1, wherein a location of the new motion zone is not associated with any particular node of the motion detection system.

9. A computer system comprising:

one or more processors; and

memory comprising instructions which, when executed by the one or more processors, cause the computer system to perform operations comprising;

obtaining observed channel response data from a motion detection system, the observed channel response data based on wireless signals transmitted over a plurality of wireless links in a space, the observed channel response data associated with a plurality of subcarriers for each wireless link over a period of time;

generating estimated channel response data for each of the plurality of subcarriers for each wireless link;

identifying transitions between zones of activity in the estimated channel response data for each of the plurality of subcarriers for each wireless link;

detecting a new motion zone of the motion detection system based on the estimated channel response data and the identified transitions; and

adjusting a number of motion zones in an adaptive model, wherein the number of motion zones is a hyperparameter of the adaptive model.

10. The computer system of claim 9, wherein each zone of activity corresponds to a segment of a time series of the observed channel response data, and

wherein generating estimated channel response data for each of the plurality of subcarriers comprises generating random data for each of the plurality of subcarriers for each wireless link based on distribution for the zones of activity and hyperparameters corresponding to characteristics of each distribution.

11. The computer system of claim 10, wherein detecting a new motion zone based on the estimated channel response data and the identified transitions comprises:

analyzing the random data and the transitions identified between each zone of activity;

adjusting the hyperparameters corresponding to characteristics of each distribution and re-generating the random data using the adjusted hyperparameters;

determining whether the random data correlates to the observed channel response data;

in response to determining the random data correlates to the observed channel response data, aggregating the identified transitions for each of the plurality of subcarriers for each wireless link; and

determining at least one of the identified transitions indicates a new motion zone.

12. The computer system of claim 11, the operations comprising, in response to determining the random data does not correlate to the observed channel response data, adjusting the hyperparameters corresponding to characteristics of each distribution and re-generating the random data using the adjusted hyperparameters until the random data correlates to the observed channel response data.

13. The computer system of claim 11, the operations comprising generating a time vector that indicates the transitions identified between the zones of activity in the estimated channel response data for each of the plurality of subcarriers for each wireless link.

14. The computer system of claim 9, the operations comprising:

providing, to a user device associated with the motion detection system, a notification indicating the new motion zone; and

in response to the notification, receiving, from the user device, a confirmation of the new motion zone or a rejection of the new motion zone.

15. The computer system of claim 14, wherein the confirmation of the new motion zone comprises a label for the new motion zone provided by a user.

16. The computer system of claim 9, wherein a location of the new motion zone is not associated with any particular node of the motion detection system.

17. A non-transitory computer-readable medium comprising instructions that, when executed by data processing apparatus, cause the data processing apparatus to perform operations comprising:

obtaining observed channel response data from a motion detection system, the observed channel response data based on wireless signals transmitted over a plurality of wireless links in a space, the observed channel response data associated with a plurality of subcarriers for each wireless link over a period of time;

generating estimated channel response data for each of the plurality of subcarriers for each wireless link;

identifying transitions between zones of activity in the estimated channel response data for each of the plurality of subcarriers for each wireless link;

detecting a new motion zone of the motion detection system based on the estimated channel response data and the identified transitions; and

adjusting a number of motion zones in an adaptive model, wherein the number of motion zones is a hyperparameter of the adaptive model.

18. The non-transitory computer-readable medium of claim 17, wherein each zone of activity corresponds to a segment of a time series of the observed channel response data, and

wherein generating estimated channel response data for each of the plurality of subcarriers for each wireless link comprises generating random data for each of the plurality of subcarriers for each wireless link based on distributions for the zones of activity and hyperparameters corresponding to characteristics of each distribution.

19. The non-transitory computer-readable medium of claim 18, wherein detecting a new motion zone based on the estimated channel response data and the identified transitions comprises:

analyzing the random data and the transitions identified between each zone of activity;

adjusting the corresponding to characteristics hyperparameters of each distribution and re-generating the random data using the adjusted hyperparameters;

determining whether the random data correlates to the observed channel response data;

in response to determining the random data correlates to the observed channel response data, aggregating the identified transitions for each of the plurality of subcarriers for each wireless link; and

determining at least one of the identified transitions indicates a new motion zone.

20. The non-transitory computer-readable medium of claim 19, the operations comprising in response to determining the random data does not correlate to the observed channel response data, adjusting the hyperparameters corresponding to characteristics of each distribution and re-generating the random data using the adjusted hyperparameters until the random data correlates to the observed channel response data.

21. The non-transitory computer-readable medium of claim 19, the operations comprising generating a time vector that indicates the transitions identified between the zones of activity in the estimated channel response data for each of the plurality of subcarriers for each wireless link.

22. The non-transitory computer-readable medium of claim 17, the operations further comprising:

providing, to a user device associated with the motion detection system, a notification indicating the new motion zone; and

in response to the notification, receiving, from the user device, a confirmation of the new motion zone or a rejection of the new motion zone.

23. The non-transitory computer-readable medium of claim 22, wherein the confirmation of the new motion zone comprises a label for the new motion zone provided by a user.

24. The non-transitory computer-readable medium of claim 17, wherein a location of the new motion zone is not associated with any particular node of the motion detection system.