Head-Up Display Depth Cues for Traffic Light Recognition
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Solution Overview
Problem
Current head-up display (HUD) devices burden drivers by requiring them to recognize traffic light colors through both real scene observation and image recognition, imposing similar visual effort and potentially distracting from safe driving.
Innovation Solution
A head-up display device that adjusts the display distance of traffic light information based on the lamp color state, positioning the image either in front of or behind the traffic light, allowing drivers to focus attention more effectively on critical color states by varying the display distance dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the lamp color state is displayed as a color image, then the traffic light information is presented to the driver, but the driver experiences visual burden and distraction from determining the lamp color state
Solution Approach 1:
The patent uses color-coded display distances to represent different traffic light states. Red traffic light corresponds to a first display distance, green to a second display distance, and yellow to a third display distance. This allows the driver to recognize traffic light states through depth perception rather than color discrimination, reducing visual burden while maintaining information transmission effectiveness.
Solution Approach 2:
The patent changes the display distance parameter of the HUD image based on the traffic light color state. By varying the virtual image distance (first, second, or third display distance) according to the detected traffic light color, the system encodes color information into spatial depth information, allowing intuitive recognition without requiring the driver to analyze color images directly.
2Measurement precision
If the display distance is adjusted based on lamp color state, then driver recognition of traffic light colors is enhanced, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic display distance adjustment mechanism that automatically changes the virtual image distance based on real-time traffic light color detection. The system continuously monitors traffic light states and adjusts the display distance parameter accordingly, creating a dynamic response that enhances recognition accuracy without requiring complex manual intervention or multiple physical display components.
Solution Approach 2:
The patent introduces a control unit as an intermediary that receives traffic light color information from a detection unit and translates it into appropriate display distance settings. This intermediary layer simplifies the overall system architecture by centralizing the logic for converting color states to spatial representations, avoiding the need for complex direct coupling between detection and display subsystems.
Data Source
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AI summary
The present invention enables recognition of traffic light lamp color in place of or in addition to simply displaying the traffic light lamp color in a color image. A projection unit 40 projects, towards a part subject to projection, display light L that can display an image 70 at a variable display distance 100. A lamp color information acquisition unit 21 acquires a lamp color 210 (220) of a traffic light which a vehicle will be driving through. A display distance adjustment unit 31 changes the display distance 100 of the image 70 based on the lamp color acquired by an information acquisition unit 20.