Brake Light Detection for Active Safety Initiation
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Solution Overview
Problem
Current active safety systems in vehicles rely heavily on sensor data for initiating braking processes, but these systems can be delayed in responding to deceleration cues from preceding vehicles, particularly in complex scenarios like downhill driving or when traffic regulations limit the visibility of brake lights.
Innovation Solution
The integration of a camera system that detects the status of brake lights of preceding vehicles to derive a risk value, which adapts the initiation sensitivity of active safety features, such as warning systems and automatic emergency braking, by using image processing to enhance the estimation of deceleration and collision risk, and optionally controlling the vehicle's brake lights to warn following traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If camera-based detection is used to detect brake lights of preceding vehicles, then the response time and precision of active safety systems is improved, but the system complexity and processing requirements increase
Solution Approach 1:
The system performs preliminary detection of brake light status and pre-calculates risk values before a collision threat fully materializes. By continuously monitoring brake light activation and pre-assessing collision risk based on detected deceleration cues, the system prepares initiation decisions in advance, reducing actual response time when intervention is needed.
Solution Approach 2:
The patent replaces complex multi-sensor fusion systems (radar, lidar, infrared) with a simplified camera-based optical detection system. The camera captures brake light status and image processing algorithms extract deceleration information, substituting expensive mechanical/optical sensors with a more affordable and simpler camera system that achieves comparable or superior response performance.
2Measurement precision
If high-cost sensors like radar or infrared lidars are used to measure position and distance, then measurement precision is improved, but the cost and energy consumption increase
Solution Approach 1:
The system replaces expensive, high-energy sensors (radar, infrared lidar) with inexpensive cameras that consume significantly less energy. Multiple standard cameras can be used to achieve the required measurement precision through image processing, providing a cost-effective alternative that maintains adequate performance while dramatically reducing system cost and power requirements.
Solution Approach 2:
Instead of using expensive direct measurement sensors, the system creates optical copies (images) of the preceding vehicle and its brake lights. These image copies are then processed to extract position, distance, and deceleration information, effectively copying the measurement function from complex sensors to a simpler camera-based system.
3Reliability
If initiation thresholds are lowered to enable earlier safety mechanism activation, then collision risk reduction is improved, but false positive rates and unnecessary activations increase
Solution Approach 1:
The system continuously monitors brake light status and uses this feedback to dynamically adjust risk assessment. By tracking the temporal pattern of brake light activation and correlating it with vehicle dynamics data, the system receives feedback that helps distinguish genuine collision threats from false cues, enabling lower thresholds without excessive false positives.
Solution Approach 2:
The initiation thresholds are not fixed but dynamically adjusted based on real-time detection of brake light status and calculated risk values. The system adapts its sensitivity according to the detected deceleration cues and contextual information, allowing lower thresholds when genuine risk is detected while maintaining higher thresholds during normal operation to avoid false activations.
Data Source
AI summary
A method and a device for determining a warning condition on the basis of brake light detection. Image data are received from a front camera of a vehicle. It is determined whether a brake light of a preceding vehicle is active. An initiation threshold is lowered or a confidence value is raised if the brake light is active. An estimated risk value is derived from the image data of the front camera and a warning signal is produced, if the estimated risk value exceeds the initiation threshold.