Radar Person Analysis for Multi-Person Action Estimation
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Solution Overview
Problem
Existing sensors, such as those using frequency modulated continuous wave (FMCW) sensors, are unable to estimate the actions of multiple individuals within a monitored area.
Innovation Solution
A person analysis system comprising radar devices and a person analysis device that detects positions and estimates actions of individuals using radar and thermal sensors, generating and analyzing point cloud data to display the positions and actions on a display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radar device is used to detect persons in a monitoring area, then position detection capability is improved, but the ability to estimate actions of multiple individuals simultaneously deteriorates
Solution Approach 1:
The patent segments the monitoring area into multiple detection zones and divides the detection of multiple persons into separate processing streams. Each person's radar echo data is independently processed to extract position and action information, enabling simultaneous multi-person analysis without information loss.
Solution Approach 2:
The patent transforms the radar echo data from traditional two-dimensional range-Doppler maps to three-dimensional point cloud representations by adding spatial depth information. This dimensional enhancement allows for better differentiation of multiple persons and their actions in complex spatial environments.
2Object-affected harmful factors
If FMCW sensor is used to detect persons while protecting privacy, then privacy protection is improved, but action estimation capability for multiple persons deteriorates
Solution Approach 1:
The system segments the detection process into position detection and action estimation stages, using only position information from radar data for action analysis. This avoids capturing identifiable personal information while still enabling action recognition through movement patterns.
Solution Approach 2:
The patent replaces traditional camera-based vision systems with radar-based detection, substituting optical/mechanical sensing with electromagnetic wave sensing. This substitution maintains privacy protection while providing sufficient data for action estimation through Doppler shift analysis.
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 accurate position detection and action estimation for multiple individuals, allowing users to easily identify actions and physical conditions of individuals within a monitored area.
Implementation Method 1
at least one radar device installed in a monitoring area and configured to output observation data including a result of observing the monitoring area by a radar method
Data Source
AI summary
Position detection and action estimation are performed for each of a plurality of persons by using a sensor that detects a person by emitting radio waves. A person analysis system includes at least one radar device installed in a monitoring area and configured to output observation data including a result of observing the monitoring area by a radar method, and a person analysis device configured to execute, based on the observation data, a first process of detecting a position of each person present in the monitoring area and a second process of estimating an action of the detected person, and display information indicating the position and the action of the person on a predetermined display device.