Motion detection for A/V recording and communication devices

• US 10,139,281 B2
• Filed: 11/22/2016
• Issued: 11/27/2018
• Est. Priority Date: 12/04/2015
• Status: Active Grant

• Current Assignee: Ring LLC (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Jeong, Changsoo
• Primary Examiner(s): Hunter, Mishawn N
• Application Number:
  US15/359,174
• Publication Number:
  US 20170160137A1
• Time in Patent Office: 735 Days
• CPC Class Codes: G01J 1/4204 with determination of ambient light solar light G01J2001/4266
• CPC Class Codes: G01J 2001/4266 for measuring solar light
• CPC Class Codes: G01J 5/0025 Living bodies ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00
• CPC Class Codes: G01J 5/0205 Mechanical elements; Supports for optical elements
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/026 Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
• CPC Class Codes: G08B 13/19 using infrared-radiation detection systems G08B13/194 takes precedence
• CPC Class Codes: G08B 13/19656 Network used to communicate with a camera, e.g. WAN, LAN, Internet
• CPC Class Codes: G08B 13/19695 Arrangements wherein non-video detectors start video recording or forwarding but do not generate an alarm themselves
• CPC Class Codes: G08B 29/185 Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
• CPC Class Codes: H04N 7/186 Video door telephones
• CPC Class Codes: H04N 7/188 Capturing isolated or intermittent images triggered by the occurrence of a predetermined event, e.g. an object reaching a predetermined position signal generation from motion picture films H04N5/253

Abstract

Audio/video (A/V) recording and communication devices according to the present embodiments comprise a processor, a motion sensor, and a camera. In various embodiments, the A/V recording and communication devices are configured to reduce latency and/or to reduce false positive indications of motion.

Claims

1. A method for an audio/video (A/V) recording and communication device, the A/V recording and communication device including at least a first motion sensor and a second motion sensor, the method comprising:

generating, by the first motion sensor, a first output signal based at least in part on detecting an object within a field of view of the A/V recording and communication device;

generating, by the second motion sensor, a second output signal based at least in part on detecting the object within the field of view of the A/V recording and communication device;

calculating a first time coordinate for a maximum of the first output signal;

calculating a second time coordinate for a maximum of the second output signal;

calculating a spacing between the first time coordinate and the second time coordinate;

comparing the spacing to a threshold value; and

upon determining that the spacing is less than the threshold value, performing at least one of (i) filtering out the first output signal and the second output signal or (ii) refraining from generating an alert signal.

2. The method of claim 1, wherein the A/V recording and communication device further includes a processor, and wherein the calculating the first time coordinate, the calculating the second time coordinate, the comparing the spacing, and the at least one of the filtering out or the refraining from generating are performed by the processor.

3. The method of claim 1, wherein the first motion sensor comprises at least a first passive infrared (PIR) sensor and the second motion sensor comprises at least a second PIR sensor.

4. The method of claim 1, wherein the first motion sensor comprises a first field of view and the second motion sensor comprises a second field of view different than the first field of view.

5. The method of claim 4, wherein the first field of view includes a first portion that does not overlap with the second field of view.

6. The method of claim 5, wherein the second field of view includes a second portion that does not overlap with the first field of view.

7. An audio/video (A/V) recording and communication device, comprising:

one or more processors;

a first motion sensor;

a second motion sensor; and

memory storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising;

receiving, from the first motion sensor, a first output signal based at least in part on the first motion sensor detecting an object in a field of view of the A/V recording and communication device;

receiving, from the second motion sensor, a second output signal based at least in part on the second motion sensor detecting the object in the field of view of the A/V recording and communication device;

calculating a first time coordinate for a maximum of the first output signal;

calculating a second time coordinate for a maximum of the second output signal;

calculating a time difference between the first time coordinate and the second time coordinate;

determining that the time difference is less than a threshold time difference; and

based at least in part on the time difference being less than the threshold time difference, performing at least one of (i) filtering out the first output signal and the second output signal or (ii) refraining from generating an alert signal.

8. The A/V recording and communication device of claim 7, wherein the first motion sensor comprises at least a first passive infrared (PIR) sensor and the second motion sensor comprises at least a second PIR sensor.

9. The A/V recording and communication device of claim 7, wherein the first motion sensor comprises a first field of view and the second motion sensor comprises a second field of view different from the first field of view.

10. The A/V recording and communication device of claim 9, wherein the first field of view includes a first portion that does not overlap with the second field of view.

11. The A/V recording and communication device of claim 10, wherein the second field of view includes a second portion that does not overlap with the first field of view.

12. An audio/video (A/V) recording and communication device, comprising:

one or more processors;

a first motion sensor;

a second motion sensor; and

memory storing instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising;

receiving, from the first motion sensor, a first output signal based at least in part on the first motion sensor detecting an object in a field of view of the A/V recording and communication device;

receiving, from the second motion sensor, a second output signal based at least in part on the second motion sensor detecting the object in the field of view of the A/V recording and communication device;

calculating a first time coordinate for a maximum of the first output signal;

calculating a second time coordinate for a maximum of the second output signal;

calculating a first spacing between the first time coordinate and the second time coordinate;

comparing the first spacing to a first threshold value;

calculating a third time coordinate for a minimum of the first output signal;

calculating a fourth time coordinate for a minimum of the second output signal;

calculating a second spacing between the third time coordinate and the fourth time coordinate;

comparing the second spacing to a second threshold value; and

upon determining that at least one of the first spacing is less than the first threshold value or the second spacing is less than the second threshold value, performing at least one of (i) filtering out the first output signal and the second output signal or (ii) refraining from generating an alert signal.

13. The A/V recording and communication device of claim 12, wherein the first motion sensor comprises at least a first passive infrared (PIR) sensor and the second motion sensor comprises at least a second PIR sensor.

14. The A/V recording and communication device of claim 12, wherein the first motion sensor comprises a first field of view and the second motion sensor comprises a second field of view different than the first field of view.

15. The A/V recording and communication device of claim 14, wherein the first field of view includes a first portion that does not overlap with the second field of view.

16. The A/V recording and communication device of claim 15, wherein the second field of view includes a second portion that does not overlap with the first field of view.