Traffic Sign Determination Using Image Recognition Priority
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Solution Overview
Problem
Existing traffic sign determination devices cannot reliably notify vehicle occupants of speed limit values when there is a discrepancy between image-detected and map-data-based traffic signs, leading to notifications being limited to a short time period due to low reliability of map data.
Innovation Solution
A traffic sign determination device that prioritizes image-recognized traffic signs over map-data-based signs, maintaining their selection until the vehicle passes the end of a road link, even if map data is outdated, to ensure accurate and prolonged notification of traffic signs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the device prioritizes map data-based traffic signs, then the notification duration is extended, but the reliability of the notified signs deteriorates when map data is outdated
Solution Approach 1:
The system dynamically switches between map data-based traffic signs and image recognition-based traffic signs depending on the situation. When the vehicle is in a area where map data is reliable, it uses map data for extended notification. When map data reliability is questionable or image recognition detects a traffic sign, it switches to image recognition results, ensuring both extended notification duration and high reliability.
Solution Approach 2:
The system introduces an image recognition section as an intermediary to verify and supplement map data. The image recognition acts as a mediator that cross-checks traffic signs from map data, ensuring accuracy while allowing the system to maintain extended notification periods using map data as the primary source.
2Reliability
If the device uses image recognition for traffic sign detection, then the reliability of detected signs is improved, but the notification time period is shortened
Solution Approach 1:
The system merges map data-based traffic sign information with image recognition-based traffic sign information. By combining both sources, the system achieves high reliability through image recognition verification while extending notification duration through map data persistence, resolving the contradiction between reliability and notification time.
3Reliability
If the device switches between map data and image recognition based on agreement, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The system changes the parameter of traffic sign determination from a single static source to a dynamic multi-source approach. It uses agreement/disagreement between map data and image recognition as a parameter to trigger switching between determination modes, managing complexity through parameter-based control rather than complex structural design.
Data Source
AI summary
A traffic sign determination device includes: an image recognition section which detects a first traffic regulation sign by performing an image recognition process on an image of an area in front of a vehicle picked up by an imaging section provided on the vehicle; a map information acquisition section which, using a position of the vehicle, acquires a road link, including a second road at the position of the vehicle, from a storage section; and a traffic sign determination section which, upon detection of a current first traffic regulation sign on a current road link, determines, until the vehicle passes an end point of the current road link, that a current traffic regulation sign to be notified to an occupant of the vehicle is the current first traffic regulation sign detected on the current road link.