Pedestrian Inattentiveness Detection via Head Pose Analysis
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Solution Overview
Problem
Fully or partially autonomous vehicles struggle to distinguish between attentive and inattentive pedestrians, leading to uniform reactions that may not ensure road safety, as they cannot determine if a pedestrian is distracted by using a mobile device while crossing the road.
Innovation Solution
A method that detects pedestrians crossing the road using camera, lidar, or radar units to determine the head pose, inferring inattentiveness if the pedestrian is looking downwards, and provides status information to central traffic control to initiate appropriate safety measures, such as collision mitigation actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If autonomous vehicles use standard detection systems to identify pedestrians, then they can detect the presence of pedestrians, but they cannot distinguish between attentive and inattentive pedestrians
Solution Approach 1:
The patent adds head pose analysis as a new dimension to pedestrian detection. Instead of only detecting pedestrian presence, the system now analyzes the orientation and angle of the pedestrian's head to determine attentiveness. This dimensional expansion allows differentiation between attentive and inattentive pedestrians using existing camera data.
Solution Approach 2:
The patent replaces complex multi-sensor systems with image processing-based head pose estimation. Instead of using additional mechanical sensors or complex detection hardware, the system uses computer vision algorithms to infer attentiveness from standard camera images by analyzing head orientation and facial features.
2Reliability
If autonomous vehicles react uniformly to all pedestrians, then the control logic is simple, but road safety is compromised for inattentive pedestrians
Solution Approach 1:
The patent applies different control strategies based on the local quality of pedestrian attentiveness. Instead of uniform reaction to all pedestrians, the system tailors its response: more aggressive braking and warning for inattentive pedestrians, and standard response for attentive ones. This localized differentiation improves safety while maintaining manageable system complexity.
Solution Approach 2:
The system performs preliminary classification of pedestrian attentiveness before executing control actions. By determining head pose and inferring attentiveness in advance, the system can prepare appropriate responses, reducing reaction time and improving safety outcomes without requiring complex real-time decision-making during the actual avoidance maneuver.
3Loss of information
If head pose detection is added to pedestrian detection, then inattentive pedestrians can be identified, but the processing complexity increases
Solution Approach 1:
The patent makes the existing camera system multi-functional by using it for both pedestrian detection and head pose estimation. Instead of adding separate sensors or processing systems, the same imaging data is analyzed through additional algorithms to extract attentiveness information, reducing overall system complexity while gaining new capabilities.
Solution Approach 2:
The system creates a simplified computational model or copy of the pedestrian's head and face geometry from image data. By constructing this digital representation, the system can efficiently estimate head pose angles and orientation without requiring complex physical measurements or multiple sensors, reducing processing complexity while preserving attentiveness information.
Data Source
Figure 1~2
AI summary
The disclosure relates to a method for detecting an inattentive pedestrian (12) crossing a roadway (R). According to the method, a pedestrian crossing (P) on the roadway (R) is detected or a pedestrian crossing location information (PCL) is received. Additionally, a head pose of a pedestrian (12) is detected. It is inferred that the pedestrian (12) is inattentive if the head pose describes that the pedestrian (12) is looking downwards. Moreover, a method for operating a vehicle (12) is described. The method comprises performing the above method for detecting an inattentive pedestrian (12). The method additionally comprises providing an inattentive pedestrian status information (IPS) to a central traffic control entity (16). Furthermore, a method for informing a central traffic control entity (16) about an inattentive pedestrian (12) is described. The pedestrian (12) is crossing a roadway (R) and carries a mobile electronic device (14). Beyond that, a method for controlling a traffic system is presented. Moreover, a data processing apparatus (18, 34, 46) and a traffic control system (58) are described.