Traffic Sign Display Device Resolving Map-Camera Mismatches
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Solution Overview
Problem
Existing traffic sign displaying devices fail to accurately display speed limit information when there is a discrepancy between camera-recognized signs and map information, leading to incorrect or missing speed limit displays due to temporary speed limits, position detection errors, or delayed map updates.
Innovation Solution
A traffic sign displaying device that includes a processor with a traffic sign recognizing section, a traffic sign information obtaining section, and a display control section, which prioritizes displaying speed limit information recognized by the camera over map information if they mismatch, and stops displaying the recognized information after a predetermined distance or time, ensuring only correct signs are displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If map information is used to display speed limit information, then speed limit information can be displayed even when traffic signs are not visible, but incorrect speed limit information may be displayed due to temporary speed limits, position detection errors, or delayed map updates
Solution Approach 1:
The system continuously compares speed limit information from map data with actual traffic sign recognition results in real-time. When a discrepancy is detected, the system uses feedback from the camera recognition to correct or stop displaying potentially incorrect map-based information, ensuring accuracy while maintaining continuous speed limit display capability
Solution Approach 2:
The system performs preliminary verification by comparing map-based speed limit information with camera-recognized traffic signs before final display. This preliminary check prevents incorrect information from being displayed to the driver, addressing the reliability issue while maintaining information accuracy
2Reliability
If only camera recognition is used to display traffic signs, then accurate real-time traffic sign information can be displayed, but speed limit information cannot be displayed when the vehicle is in areas without visible traffic signs
Solution Approach 1:
The system merges two information sources: map-based speed limit data and camera-recognized traffic sign data. By combining these sources, the system achieves both comprehensive coverage (displaying speed limits even when signs are not visible) and accuracy (verifying against actual signs when visible), resolving the contradiction between adaptability and reliability
Solution Approach 2:
The display system serves multiple functions: it displays map-based speed limit information for areas without visible signs, and switches to camera-recognized information when signs are detected. This multi-functionality ensures continuous, accurate speed limit display across all driving scenarios, whether signs are visible or not
3Productivity
If traffic sign information from map data is displayed without verification, then continuous speed limit information can be provided, but the information may be outdated or incorrect due to temporary speed limits or position detection errors
Solution Approach 1:
The system implements continuous feedback verification where camera recognition results are compared against map-based speed limit information. This feedback mechanism maintains information continuity by using map data as a default while ensuring precision through real-time verification, preventing display of outdated or incorrect information
Solution Approach 2:
The system dynamically adjusts its information source based on real-time conditions. When traffic signs are visible and recognizable, it switches to camera-based information for higher precision. When signs are not visible, it relies on map data for continuity. This dynamic adaptation maintains both productivity and measurement precision across varying driving conditions
Data Source
AI summary
A traffic sign displaying device comprises a processor including a traffic sign recognizing section recognizing first traffic sign information on a traffic sign included in an image of an area ahead of a vehicle, a traffic sign information obtaining section obtaining from map information second traffic sign information on a traffic sign of a road based on position information on the vehicle, a traffic sign display portion displaying traffic sign information and a traffic sign display control section for controlling the traffic sign display portion, wherein if the first traffic sign information does not match the second traffic sign information, the traffic sign display control section stops displaying traffic sign information after the vehicle runs a predetermined distance or over a predetermined time with the traffic sign display control section displaying on the traffic sign display portion either the first traffic sign information or the second traffic sign information.