Smart Motion Detection Device Using Thermal Triggering
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Solution Overview
Problem
Existing motion detection systems, such as those using external thermal sensors, often fail to capture monitoring images or videos promptly after detecting unusual temperature variations due to delays in host and image detection device wake-up periods and exposure adjustments, leading to missed recordings.
Innovation Solution
A smart motion detection device incorporating an image sensor, an infrared sensor, and a processor that utilizes a temperature sensor to determine the reliability of thermal motion detection, triggering image recording only when image quality is unacceptable and ambient temperature exceeds a threshold, thereby ensuring accurate and timely capture of monitoring images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system uses an external thermal sensor to detect temperature variation, then motion detection capability is provided, but recording delay occurs due to host wake-up period and exposure adjustment time
Solution Approach 1:
The image sensor is kept in a standby state with preliminary configuration, allowing it to immediately capture images when triggered by the thermal sensor, eliminating the need for host wake-up and exposure adjustment delays
Solution Approach 2:
The image sensor acts as an intermediary device that directly receives triggering signals from the thermal sensor and autonomously executes recording operations, bypassing the delayed host processing chain
2Loss of time
If the image sensor executes image recording mode according to alarm signal, then recording timeliness is improved, but energy consumption increases
Solution Approach 1:
The image sensor dynamically switches between standby mode and recording mode based on thermal sensor triggers, maintaining timeliness while minimizing energy consumption through adaptive state changes
Solution Approach 2:
The system changes operational parameters of the image sensor (from active recording to standby state) based on environmental conditions and trigger signals, optimizing the balance between timeliness and energy usage
3Reliability
If the system captures monitoring images continuously, then recording completeness is improved, but energy consumption and data storage requirements increase
Solution Approach 1:
Instead of continuous recording, the system uses periodic triggering based on thermal sensor detection, capturing images only when motion or temperature changes occur, thus ensuring recording completeness of relevant events while minimizing energy consumption
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
The solution enables high-precision motion detection across various environments, distinguishing target objects from backgrounds effectively, even in extreme conditions, by combining thermal and image sensors to improve accuracy and prevent miscomputations, while also conserving energy through adaptive mode switching.
Implementation Method 1
The infrared sensor detects a thermal motion condition and provides an alarm signal accordingly
Implementation Method 2
The smart motion detection device includes an temperature sensor adapted to detect an ambient temperature around the infrared sensor
Implementation Method 3
The image sensor captures a monitoring image
Data Source
AI summary
A smart motion detection device includes an image sensor, an infrared sensor and a processor. The image sensor captures a monitoring image. The infrared sensor detects a thermal motion condition and provides an alarm signal accordingly. The processor executes an image recording mode of the image sensor only according to the alarm signal when an image quality of the monitoring image is unacceptable.