Dual Motion Sensor System for Reducing False Triggers
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Solution Overview
Problem
Motion-activated camera systems with wide field-of-view (FOV) sensors are prone to false triggers, leading to unnecessary power consumption and resource drainage due to detecting motion from persistent objects of interest that do not enter or exit a given space.
Innovation Solution
Implementing a dual-motion sensor system with a first sensor having a wide FOV and a second sensor with a narrow FOV, allowing the system to dynamically switch between modes based on the presence of persistent objects of interest, where the first sensor triggers camera activation in wide-FOV mode and the second sensor in narrow-FOV mode when a persistent object is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a motion sensor with a wide FOV is used to detect motion early, then motion detection capability is improved, but false triggers increase due to persistent objects of interest
Solution Approach 1:
The system segments the FOV into a wide FOV for early motion detection and a narrow FOV for accurate people detection. The motion sensor's FOV is divided into multiple regions, with the narrow FOV focused on the threshold region (entryway) where actual people crossing events occur. This segmentation allows the system to benefit from both wide coverage for early warning and narrow focus for accurate detection.
Solution Approach 2:
The system applies different detection qualities to different regions of the FOV. The narrow FOV region (threshold region) receives enhanced attention and processing resources for accurate people detection, while the wide FOV region serves as a broader monitoring zone. This local quality differentiation ensures high detection accuracy where needed while maintaining overall situational awareness.
2Measurement precision
If the camera captures images frequently to ensure accurate tracking, then tracking accuracy is improved, but power consumption increases
Solution Approach 1:
The system uses periodic motion detection intervals instead of continuous camera operation. The motion sensor periodically checks for motion events, and only triggers the camera when motion is detected within the narrow FOV. This periodic action pattern significantly reduces power consumption compared to continuous camera operation while maintaining accurate tracking of people crossing the threshold region.
Solution Approach 2:
The motion sensor serves as an intelligent trigger mechanism that automatically activates the camera only when necessary. Instead of the camera operating continuously or being manually controlled, the system uses the motion sensor's periodic detection to self-regulate camera activation, ensuring the camera captures images only when actual people crossing events are detected, thereby optimizing power usage.
3Loss of time
If the system monitors a wide FOV continuously, then early motion detection is maintained, but resources are drained by false triggers from persistent objects
Solution Approach 1:
The system dynamically adjusts its monitoring strategy based on detected conditions. When motion is detected in the wide FOV, the system transitions to focused monitoring of the narrow FOV region. This dynamic adjustment allows the system to maintain early detection capabilities through wide FOV monitoring while conserving resources by concentrating processing power and camera activation on the narrow FOV where actual people crossing events occur.
Solution Approach 2:
The wide FOV motion detection serves as a preliminary screening stage that identifies potential events of interest. Before full camera activation and detailed analysis are initiated, the system performs preliminary motion detection across the wide FOV to determine whether further action is warranted. This preliminary action filters out false triggers from persistent objects while maintaining the capability for early detection of actual people crossing events.
Data Source
AI summary
This disclosure provides methods, devices, and systems for controlling motion-activated cameras. The present implementations more specifically relate to reducing false triggers in motion-activated camera systems. In some implementations, a motion-activated camera system may include a camera, a first motion sensor having a wide field-of-view (FOV), and a second motion sensor having a narrow FOV. In some aspects, the motion-activated camera system may be configured to operate in a wide-FOV mode or a narrow-FOV mode. In some implementations, the first motion sensor may trigger the camera to capture images of a scene responsive to motion detected in the wide FOV when the system is configured to operate in the wide-FOV mode. In some other implementations, the second motion sensor may trigger the camera to capture images of the scene responsive to motion detected in the narrow FOV when the system is configured to operate in the narrow-FOV mode.