Driver Assistance Speed Limit Selection at Road Exits
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Solution Overview
Problem
Conventional intelligent speed limit assist systems often misrecognize speed limits at exits, leading to incorrect warnings and control actions in advanced driver assistance systems, causing confusion for drivers.
Innovation Solution
An apparatus and method that utilize a camera and controller to accurately identify speed limit signs by determining the vehicle's exit status based on turn signal lamp operation and history, selectively recognizing relevant speed limit signs to avoid misrecognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ISLA system recognizes all speed limit signs in the field of view, then the system can detect speed limits, but the system misrecognizes speed limits irrelevant to the actual driving direction
Solution Approach 1:
The patent segments the field of view into multiple regions (first region for straight-ahead driving, second region for right turn, third region for left turn) and selectively processes speed limit signs based on the detected driving direction. This segmentation allows the system to focus only on relevant speed limit signs, preventing misrecognition of signs in irrelevant directions while maintaining accurate speed limit detection.
2Measurement precision
If the system uses turn signal lamp information to determine driving direction, then the system can select relevant speed limit signs, but the system may fail to detect driving direction changes made without turn signals
Solution Approach 1:
The patent merges multiple detection methods: turn signal lamp detection, steering angle sensor detection, and yaw rate sensor detection. By combining these different sources of driving direction information, the system achieves more reliable and comprehensive driving direction detection, covering both signaled and unsignaled direction changes.
3Adaptability or versatility
If the system processes multiple speed limit signs simultaneously, then the system can handle complex exit sections, but the system increases computational complexity and processing time
Solution Approach 1:
The patent implements dynamic processing by first detecting the driving direction, then dynamically selecting and processing only the speed limit signs relevant to that direction. This dynamic approach adapts the processing scope based on real-time driving conditions, reducing computational complexity while maintaining versatility across different road configurations including exits and intersections.
Data Source
AI summary
Disclosed herein is an apparatus including a camera installed in a vehicle, having a forward field of view of the vehicle, and configured to acquire image data, and a controller configured to process the image data. The controller identifies whether the vehicle exits from a road at an exit of the road on which the vehicle travels, identifies a plurality of speed limit signs from the image data, selects a speed limit sign to identify a speed limit among the plurality of speed limit signs based on whether the vehicle exits from the road, and identifies a speed limit of the selected speed limit sign.