Lane-Change Drive Assist Using Pre-Recognized Road Markings
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Solution Overview
Problem
Existing vehicle drive assist technologies face challenges in accurately recognizing road markings and lane changes, leading to potential inappropriate drive assist operations, especially when lane changes occur or road markings are not recognized.
Innovation Solution
A drive assist device that includes a marking recognition unit to identify road markings and permitted travel directions, a detection unit to detect lane changes, and an information management unit to update and store this information, ensuring accurate lane guidance and notifications to passengers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If road markings are recognized only when currently in the lane, then recognition load is reduced, but drive assist accuracy deteriorates after lane changes
Solution Approach 1:
The system performs preliminary recognition of road markings in adjacent lanes before the vehicle actually changes lanes. By pre-recognizing the permitted travel directions of adjacent lanes and storing this information, the system ensures that accurate drive assist information is immediately available when a lane change occurs, eliminating the need to re-acquire markings after the maneuver.
Solution Approach 2:
The system prepares backup information by recognizing and storing road marking data from adjacent lanes in advance. This creates a buffer of pre-acquired information that cushions against the loss of accuracy that would otherwise occur during lane changes, ensuring continuous reliable drive assist functionality.
2Reliability
If road markings in adjacent lanes are continuously recognized, then drive assist accuracy is maintained, but processing time increases
Solution Approach 1:
The system performs preliminary recognition of road markings in adjacent lanes only when needed for potential future lane changes, not continuously. By storing this pre-recognized information, the system maintains accuracy without the ongoing processing burden of continuous recognition.
Solution Approach 2:
The system updates adjacent lane marking information periodically or event-driven (when lane changes are detected or anticipated) rather than continuously. This periodic updating approach maintains information freshness and accuracy while significantly reducing the overall processing time and computational load compared to continuous recognition.
3Measurement precision
If road markings are re-recognized after lane changes, then accuracy is restored, but drive assist responsiveness deteriorates
Solution Approach 1:
The system performs the recognition action in advance, before the lane change occurs. By having already identified the road markings and permitted travel directions of adjacent lanes, the system eliminates the need for post-lane-change re-acquisition, thus maintaining both high accuracy and rapid responsiveness.
Data Source
AI summary
A drive assist device includes: a marking recognition unit configured to recognize a road marking on a driving lane and a road marking on a first adjacent lane from an image of a pavement captured from a vehicle and specify a permitted travel direction of the driving lane and a permitted travel direction of the first adjacent lane; a detection unit configured to detect a lane change performed by the vehicle; and an information management unit configured to cause a storage unit to store first information indicating the permitted travel direction of the driving lane and second information indicating the permitted travel direction of the first adjacent lane specified by the marking recognition unit, and in a case in which the detection unit detects the lane change to the first adjacent lane, update the information stored in the storage unit to change the second information as the permitted travel direction of the driving lane and the first information as the permitted travel direction of a second adjacent lane.