Adaptive Headlight Dimming for Obstructed Pedestrian Recognition
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Solution Overview
Problem
Existing headlight control systems face challenges in accurately setting a dimming area for pedestrians, especially when a part of the pedestrian is obstructed by a shielding object, leading to potential inappropriate dimming area settings.
Innovation Solution
A headlight control device that includes an external sensor for detecting the environment, a pedestrian recognizer for identifying pedestrian areas, a headlight controller for adjusting light brightness, and a change determination unit that adjusts the occupancy ratio of the dimming area based on changes in the pedestrian area's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a predetermined proportion of the pedestrian height is set as the dimming area, then the dimming area can be set without requiring high detection accuracy, but the dimming area setting becomes inappropriate when the pedestrian is obstructed by shielding objects
Solution Approach 1:
The patent applies dynamics by making the dimming area occupancy ratio adjustable rather than fixed. The headlight controller dynamically changes the occupancy ratio of the dimming area based on the detected pedestrian height and recognition confidence level. When detection accuracy is low or obstruction is detected, the system adjusts the occupancy ratio to ensure the dimming area still covers the upper body region appropriately, resolving the contradiction between using simple fixed proportions and maintaining reliable dimming area settings under various conditions
2Ease of operation
If the detection accuracy of pedestrian upper body is insufficient, then it is difficult to set the dimming area accurately, but using a fixed proportion may cause inappropriate dimming when pedestrian is obstructed
Solution Approach 1:
The patent applies parameter changes by modifying the occupancy ratio parameter of the dimming area based on detected conditions. The headlight controller changes the occupancy ratio according to the pedestrian height detection results and recognition confidence levels. This allows the system to maintain simple operation through automated parameter adjustment while ensuring reliable dimming area settings even when pedestrians are partially obstructed by shielding objects
Data Source
AI summary
A headlight control device including a headlight that emits light toward an area in front of a host vehicle, an external sensor that detects an external environment of the host vehicle, a pedestrian recognizer that recognizes a pedestrian area including a pedestrian located in front of the host vehicle based on a detection result of the external sensor, a headlight controller that reduces the brightness of light with which a dimming area including an upper end of the pedestrian area in the pedestrian area is irradiated, and a change determination unit that determines, based on a detection result of the external sensor, whether the height of the pedestrian area has changed, wherein the headlight controller changes the occupancy ratio of the dimming area to the pedestrian area when the height of the pedestrian area has changed.