PIR Sensor Sensitivity Adjustment for Motion Detection
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Solution Overview
Problem
Current audio/video recording and communication devices, such as doorbells, often generate false positives and fail to record important motion due to reliance on single motion detection technologies like PIR sensors, especially in varying light conditions, leading to inefficiencies and inaccuracies.
Innovation Solution
The implementation of a method that adjusts day-night sensitivity for motion detection using a combination of passive infrared (PIR) sensors and light sensors, where the sensitivity of the PIR sensor is adjusted based on light conditions, and image data is used to determine whether to activate recording, thereby reducing false positives and ensuring important motion is captured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motion detection technology (PIR sensor) is used, then the device complexity is reduced, but the measurement precision and reliability of motion detection deteriorate due to false positives and failures to record important motion
Solution Approach 1:
The patent combines multiple motion detection technologies (PIR sensor and camera-based motion detection) into a unified system. The PIR sensor detects thermal changes while the camera captures visual motion, and both are processed together to determine whether to activate recording. This merging of detection methods resolves the contradiction by maintaining system complexity at an acceptable level while dramatically improving measurement precision through multi-modal verification.
Solution Approach 2:
The camera serves multiple functions: it acts as both a recording device and a motion detection sensor. By utilizing the camera's dual role, the system achieves higher reliability without proportionally increasing complexity, as the same hardware component performs both recording and detection functions under different operational conditions.
2Measurement precision
If PIR sensor sensitivity is increased to capture all motion, then measurement precision improves, but false positives increase due to detection of animals, swaying tree branches, and other unimportant motion
Solution Approach 1:
The system implements feedback by continuously monitoring motion detection signals from both the PIR sensor and camera, and using this information to dynamically adjust the activation decision. The processor analyzes feedback from both sensors to determine whether detected motion warrants recording activation, thereby reducing false positives while maintaining sensitivity to important motion events.
Solution Approach 2:
The processor acts as an intermediary between the PIR sensor and the recording activation mechanism. It receives signals from the PIR sensor, processes them alongside camera data, and makes the final determination about whether to activate recording. This intermediary role allows the system to filter out false positives while maintaining high sensitivity to genuine motion events.
3Object-generated harmful factors
If prior art efforts are made to prevent false positives, then false positives are reduced, but failures to record important person motion increase
Solution Approach 1:
The patent merges PIR sensor detection with camera-based motion detection to create a more reliable system. By combining these two detection methods, the system achieves both false positive reduction and improved reliability for detecting important motion events. The multi-modal approach ensures that neither false positives nor important events are missed, resolving the contradiction between these two objectives.
4Object-affected harmful factors
If direct sunlight or glare is present, then false positives and failures to record increase, but the light conditions are variable and cannot be controlled
Solution Approach 1:
The system dynamically adapts to varying light conditions by continuously monitoring input from both the PIR sensor and camera, and adjusting its motion detection and recording activation decisions in real-time. This dynamic approach allows the system to maintain reliability across different lighting scenarios, from direct sunlight to glare conditions to nighttime, resolving the contradiction between harmful light effects and adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of motion detection by minimizing false positives and failures to record, particularly in varying light conditions, by dynamically adjusting the sensitivity of the PIR sensor and utilizing image data to confirm motion, resulting in improved recording reliability.
Implementation Method 1
receiving a PIR sensor output signal from the PIR sensor
Implementation Method 2
receiving a light sensor output signal from the light sensor
Data Source
AI summary
An audio/video (A/V) recording and communication device includes a camera, a passive infrared (PIR) sensor, and a light sensor. A method receives a PIR sensor output signal from the PIR sensor, receives image data from the camera, and receives a light sensor output signal from the light sensor. The method determines, using the light sensor output signal and at least one of the PIR sensor output signal and the image data whether to activate recording of the image data, and upon determining to activate recording of the image data, generates an alert. The method transmits the alert to a client device associated with the A/V recording and communication device.