Audio Video Device Camera Motion Detection Power Management
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Solution Overview
Problem
Home security devices face issues with false motion detection by PIR sensors and power consumption, leading to unnecessary notifications and battery drain, as they often activate cameras too late to capture relevant events and waste power on non-interesting objects.
Innovation Solution
The use of multiple low-resolution cameras with overlapping fields of view for initial motion detection and confirmation, allowing the main camera to activate only when an object of interest is identified, and power management to conserve energy by deactivating cameras when not needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If PIR sensors are used for motion detection, then motion detection capability is improved, but false detection rate increases
Solution Approach 1:
The patent introduces low-resolution cameras as intermediary devices between the PIR sensor and the main high-resolution camera. When PIR detects motion, the low-resolution camera first confirms whether the motion corresponds to a human object. This intermediary verification step filters out false positives from the PIR sensor while maintaining reliable motion detection capability.
2Reliability
If main camera is activated continuously for monitoring, then event capture reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic activation of the main camera based on detected events. Instead of continuous operation, the main camera is activated only when the low-resolution camera confirms human presence. This periodic action pattern maintains event capture reliability for actual incidents while dramatically reducing power consumption during periods of no activity.
Solution Approach 2:
The low-resolution camera performs preliminary detection and verification before activating the main camera. This preliminary action ensures that the main camera is only activated when necessary, maintaining reliability for capturing actual events while avoiding unnecessary power consumption from continuous or premature activation.
3Use of energy by moving object
If low-resolution cameras are used for initial detection, then power consumption is reduced, but detection precision decreases
Solution Approach 1:
The patent segments the detection system into two levels: low-resolution cameras for initial motion detection and confirmation, and the main high-resolution camera for detailed event capture. This segmentation allows the system to use lower power consumption for the frequent initial detection tasks while reserving high precision capabilities for when they are actually needed, achieving both power efficiency and detection precision.
Data Source
AI summary
This disclosure describes, in part, an audio/video (A/V) device that includes a first camera for generating first image data and one or more second cameras for both motion detection and generating second image data. For instance, the A/V device may generate and then store the second image data in one or more buffers. The A/V device may then detect an event, such as possible motion of an object. Based on detecting the event, A/V device may cause the one or more second cameras to cease generating the second image data and cause the first camera to begin generating the first image data. The A/V device may then process the second image data and send the processed second image data to a computing system. Next, the A/V device may process the first image data and send the processed first image data to the computing system.