Radar Occupant Detection With ROI Masking for Precise Counts
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Solution Overview
Problem
Existing systems lack the ability to accurately and economically monitor the number of people in specific regions of an environment, leading to inefficiencies in occupant-driven control measures and raising privacy concerns.
Innovation Solution
An occupant detection device with a radar detection circuit and control circuit that determines the location of occupants relative to a first coordinate system, converts it to a second coordinate system associated with a region of interest, and adjusts occupant counts based on predefined regions and masked areas, using passive infrared detection and communication circuits for reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional occupancy detection methods are used, then the system is simple to implement, but the measurement precision of occupant count in specific regions is insufficient
Solution Approach 1:
The detection space is segmented into multiple regions of interest with different coordinate systems. Each region can be independently configured and monitored, allowing precise occupancy counting in specific areas while maintaining overall system manageability through modular region-based architecture.
Solution Approach 2:
A coordinate transformation module acts as an intermediary between the radar detection coordinate system and the region-of-interest coordinate systems. This intermediary component handles the complex coordinate conversions automatically, providing precise region-based occupancy detection without requiring manual calculation or increasing operational complexity.
2Loss of information
If comprehensive occupancy monitoring is implemented, then the information accuracy for environmental management is improved, but the loss of information regarding privacy increases
Solution Approach 1:
The system implements local quality by allowing selective monitoring of specific regions of interest rather than treating the entire space uniformly. Users can configure which areas require occupancy monitoring, enabling targeted data collection that balances environmental management needs with privacy protection in unmonitored areas.
Solution Approach 2:
The system extracts only the necessary occupancy information for region-based environmental management while excluding unnecessary detailed tracking. By focusing on count data in specific regions rather than comprehensive individual tracking, the system reduces privacy information loss while maintaining management effectiveness.
3Use of energy by moving object
If real-time occupancy detection is performed, then the response time for environmental control is reduced, but the energy consumption increases
Solution Approach 1:
The radar detection operates with periodic scanning rather than continuous monitoring, reducing energy consumption while maintaining timely occupancy detection. The system can adjust scanning frequencies based on environmental needs, providing real-time responses when required while conserving energy during stable periods.
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
Enables precise monitoring of occupant counts within specific areas, improving energy and space management while minimizing privacy concerns through accurate tracking and reporting.
Implementation Method 1
an occupant detection circuit (e.g., a radar detection circuit)
Implementation Method 2
using passive infrared detection
Data Source
AI summary
An occupant detection device may be configured to detect an occupant in a space where the occupant detection device is installed. The occupant detection device may include an occupant detection circuit that is configured to determine locations of one or more occupants in the space. The occupant detection device may also include a low-power detection circuit that is configured to indicate an occupancy or vacancy condition in the space. The occupant detection device may include a control circuit that is configured to determine that the low-power detection circuit indicates that there are no occupants within the space. The control circuit may determine that there is movement in an occupant map or a region of interest (ROI) as indicated by the locations of the one or occupants as determined by the occupant detection circuit. The control circuit may configure masked regions around the locations of the movement, and store the masked regions in memory. The movement detected by the occupant detection device within the masked regions may be ignored when determining an occupant count for the space.