Vehicle Headlight Dimming for Pedestrian Contrast
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Solution Overview
Problem
Existing vehicle headlight systems struggle to effectively make pedestrians stand out when they are within the irradiation range of the headlight, especially in high luminance conditions, as the contrast between the pedestrian and their surroundings is low, making it difficult for drivers to recognize them.
Innovation Solution
A vehicle headlight control device that includes a pedestrian detection unit and a headlight control unit, which executes dimming control by dimming the periphery of the pedestrian within the irradiation range of the headlight, enhancing the contrast through controlled dimming of the LED array in the high beam unit, allowing the pedestrian to be highlighted even in high beam conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the headlight irradiates the entire front region including the pedestrian, then the overall visibility is improved, but the contrast between the pedestrian and surroundings is reduced making it difficult to recognize the pedestrian
Solution Approach 1:
The patent applies local quality by creating a dimming region with different illumination characteristics around the pedestrian. The headlight control unit selectively dims specific regions (left and right sides of the pedestrian) while maintaining normal illumination in other areas. This local modification of illumination quality enhances pedestrian visibility by creating contrast without sacrificing overall scene visibility.
2Loss of information
If a dedicated marking light source is used to irradiate the pedestrian, then the pedestrian can be highlighted, but the system complexity increases and it cannot effectively mark pedestrians in high beam irradiation regions
Solution Approach 1:
The patent applies universality by enabling the existing headlight to perform dual functions: general illumination and pedestrian marking. By controlling the headlight to create dimming regions around detected pedestrians, the same lighting system achieves both overall visibility and selective pedestrian highlighting without requiring a dedicated marking light source, thus reducing system complexity while maintaining effectiveness.
3Loss of information
If the headlight luminance is reduced to create contrast, then the pedestrian can be highlighted, but the overall visibility and safety is compromised
Solution Approach 1:
The patent applies local quality by creating a dimming region with different illumination characteristics around the pedestrian. The headlight control unit selectively dims specific regions (left and right sides of the pedestrian) while maintaining normal illumination in other areas. This local modification of illumination quality enhances pedestrian visibility by creating contrast without sacrificing overall scene visibility.
Data Source
AI summary
A vehicle headlight control device is provided with: a pedestrian detection unit which detects a pedestrian; and a headlight control unit which controls an irradiation state of a headlight. When the pedestrian detection unit detects a pedestrian within an irradiation range of the headlight, the headlight control unit executes dimming control for controlling the irradiation state of the headlight so that a periphery of the pedestrian is dimmed. The pedestrian is irradiated with a part of a high beam or a low beam, or marking light emitted from a dedicated light source. A dimming region is formed around the pedestrian by the dimming control, and contrast in brightness between the pedestrian and his/her surroundings can be raised.