Dynamic Threshold Adjustment for Vehicle Exterior Environment Recognition
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Solution Overview
Problem
Current vehicle exterior environment recognition systems face challenges in accurately identifying regions irradiated with high beams, leading to potential erroneous detection of tail lamps and headlamps, which can result in unstable light-distribution control of headlamps.
Innovation Solution
A vehicle exterior environment recognition apparatus that includes a vehicle extractor to identify tail lamps and headlamps, a recognizer to determine the presence of preceding or oncoming vehicles, and a light-distribution controller to switch between low and high beams based on the angle of view, depth distance, and cut-off line angle, thereby adjusting thresholds for accurate identification and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher threshold is set for extracting tail lamps in regions irradiated with high beams, then erroneous detection is prevented, but accurate identification of tail lamps in those regions becomes difficult
Solution Approach 1:
The threshold for tail lamp extraction is made dynamic by adjusting it according to whether the region is irradiated with high beams. The determination unit identifies high beam irradiated regions based on angle of view, depth distance, and cut-off line angle, then the extraction unit applies different thresholds: a first (lower) threshold for non-irradiated regions and a second (higher) threshold for irradiated regions. This dynamic adjustment resolves the contradiction by adapting the threshold to the local lighting conditions.
Solution Approach 2:
Different extraction thresholds are applied to different regions of the image based on local lighting conditions. Regions irradiated with high beams use a higher threshold, while non-irradiated regions use a lower threshold. This local differentiation allows the system to maintain high reliability in irradiated regions while preserving measurement precision in non-irradiated regions.
2Reliability
If the region irradiated with high beams is not accurately identified, then light-distribution control becomes unstable, but increasing the complexity of identification algorithms may reduce processing speed
Solution Approach 1:
The determination unit segments the image into regions irradiated with high beams and regions not irradiated, based on angle of view, depth distance, and cut-off line angle. By dividing the image space and applying different processing rules to each segment, the system achieves accurate high beam region identification without requiring overly complex algorithms, thus maintaining both reliability and processing efficiency.
Solution Approach 2:
The determination unit acts as an intermediary between the image processing unit and the extraction unit. It uses geometric parameters (angle of view, depth distance, cut-off line angle) to identify high beam irradiated regions and provides this information to the extraction unit, which then adjusts its extraction threshold accordingly. This intermediary layer simplifies the overall system architecture while ensuring accurate region identification.
Data Source
AI summary
A vehicle exterior environment recognition apparatus includes a computer and an illumination mechanism. The computer serves as a vehicle extractor that extracts a tail lamp of a preceding vehicle, a preceding vehicle recognizer that recognizes the preceding vehicle on a basis of the extracted tail lamp, and a light-distribution controller that determines light distribution of a headlamp. The illumination mechanism switches between a low beam and a high beam on a basis of instruction issued by the light-distribution controller. The vehicle extractor determines, on a basis of an angle of view and a depth distance of a block in the image, and a cut-off line angle of the high beam, whether the block is irradiated with the high beam, and changes, on a basis of a result of the determination as to whether the block is irradiated, thresholds that determine whether the tail lamp is the tail lamp.