Dual PIR Sensor Surveillance Camera for Entrance Detection
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Solution Overview
Problem
Existing security camera systems installed at building entrances often require separate spaces for departure detection and imaging means, limiting installation flexibility and precision in detecting individuals approaching or leaving the building.
Innovation Solution
An imaging apparatus installed outside a building, equipped with a camera and dual PIR sensors with different infrared light detection areas, uses signal magnitudes to initiate imaging of approaching individuals with high precision, distinguishing between visitors and departing residents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate departure detection means and imaging means are installed in at least two spaces of a building, then the functions are distributed, but the installation place is limited and device complexity increases
Solution Approach 1:
The patent combines the departure detection means and imaging means into a single integrated security camera device. The imaging apparatus includes both the camera for capturing images and the detection means for detecting departure, merging two previously separate functions into one device that can be installed in a single location, thereby reducing installation complexity while maintaining detection reliability
Solution Approach 2:
The security camera is designed to perform multiple functions: it acts as both an imaging device for capturing images of people and a departure detection device. This multi-functional design allows the single apparatus to replace multiple separate devices, reducing the number of installation locations needed while preserving the reliability of departure detection
2Adaptability or versatility
If imaging apparatus is installed outside the building, then installation flexibility is improved, but detection precision of approaching individuals is reduced
Solution Approach 1:
The patent employs infrared sensors that detect thermal radiation in the electromagnetic spectrum rather than visible light. This dimensional change in detection methodology allows the apparatus to detect approaching individuals accurately even when installed outside the building, overcoming the limitation of reduced detection precision while maintaining installation flexibility
Solution Approach 2:
The infrared sensors act as an intermediary detection mechanism between the camera and the approaching individual. The sensors detect thermal energy emitted by the individual and trigger the camera to capture images, enabling accurate detection from an external installation position without requiring direct visual contact or proximity
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 configuration reduces installation constraints and enhances the accuracy of detecting individuals approaching the entrance while minimizing unnecessary imaging of departing residents, thus optimizing space usage and detection precision.
Implementation Method 1
a first sensor which outputs a first signal according to infrared light, a second sensor which outputs a second signal according to infrared light
Data Source
AI summary
An imaging apparatus includes a camera which images a person, a first sensor which outputs a first signal according to infrared light, a second sensor which outputs a second signal according to infrared light, and controller which starts imaging the person by the camera based on magnitudes of the first signal and the second signal. An infrared light detection area of the first sensor is far from an entrance of a building in comparison with an infrared light detection area of the second sensor, and the infrared light detection area of the second sensor is close to the entrance of the building in comparison with the infrared light detection area of the first sensor.