Vehicle Speed Limit Display Control via Camera Recognition
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Solution Overview
Problem
Existing driver assistance systems fail to accurately display temporary speed limits that are not registered in map information, leading to incorrect speed limits being displayed when temporary changes occur due to road conditions or weather, which can mislead drivers.
Innovation Solution
A driver assistance system that suppresses updates to displayed speed limits based on map information when temporary speed limits are detected, using onboard cameras to recognize temporary speed limit signs and disabling updates during temporary speed limit sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed limit displayed on the display device is updated based on map information, then the speed limit information is kept current for general use, but incorrect speed limits are displayed when temporary speed limits are in effect
Solution Approach 1:
The system uses a camera to capture images of traffic signs and an image recognition unit to detect temporary speed limit signs. When a temporary speed limit sign is detected, this information feeds back to the display control unit, which then suppresses updates from map information. This feedback mechanism ensures the displayed speed limit reflects actual road conditions rather than relying solely on pre-registered map data.
Solution Approach 2:
The image recognition unit acts as an intermediary between the physical traffic sign environment and the display system. It detects temporary speed limit signs and translates this visual information into control signals that prevent incorrect map-based speed limit updates, thereby mediating between static map information and dynamic road conditions.
2Loss of information
If the system uses map information to display speed limits, then speed limit information is available even where no traffic signs are installed, but temporary speed limits not registered in map information cannot be detected
Solution Approach 1:
The system merges two information sources: map information providing baseline speed limits and image recognition providing detection of temporary speed limit signs. The display control unit combines these sources intelligently, using map information when no temporary signs are present and image recognition data when temporary signs are detected, thereby achieving both comprehensive coverage and accurate temporary limit detection.
Solution Approach 2:
The system dynamically switches between using map information and image recognition results based on the presence of temporary speed limit signs. When a temporary sign is detected, the system transitions from relying on static map data to displaying the dynamic, detected temporary speed limit, ensuring the information remains current and accurate.
Data Source
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AI summary
A driver assistance method that is applied to a vehicle (1) includes: reading a speed limit at a position at which the vehicle (1) is traveling, from map information (MAP) in which the speed limit is registered; displaying the speed limit read from the map information (MAP) on a display device (30); and disabling updating of the speed limit to be displayed on the display device (30) based on the map information (MAP) in a first section (XI) in which a temporary speed limit is set, even when the speed limit registered in the map information (MAP) changes.