Stop Line Search Area Adjustment via Traffic Light Detection
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Solution Overview
Problem
Existing stop line searching devices face challenges in accurately identifying the stop line due to variations in road surface conditions, leading to potential erroneous recognition of different lines as the stop line.
Innovation Solution
A stop line searching device that includes an image acquisition unit, a traffic light detection unit, and a setting unit, which sets a stop line searching area based on the detection of traffic lights, adjusting the area's size and boundaries according to the presence and position of front-side and rear-side traffic lights, and the number of lanes at the intersection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed search area is used for stop line recognition, then the device complexity is reduced, but the measurement precision of stop line detection deteriorates due to road surface variations causing erroneous recognition
Solution Approach 1:
The patent applies dynamics by making the stop line search area adjustable rather than fixed. The control unit dynamically changes the search area parameters (position and size) based on detected traffic light positions, allowing the system to adapt to different road conditions and intersection configurations, thereby improving detection accuracy without requiring complex hardware modifications
Solution Approach 2:
The patent changes the parameters of the search area (position coordinates and dimensions) based on traffic light detection results. By adjusting these parameters dynamically, the system optimizes the search region to focus on areas where the stop line is most likely to be located, reducing false detections from road surface markings while maintaining system simplicity
2Reliability
If the stop line search area is expanded to cover all possible locations, then the reliability of stop line detection is improved, but the loss of information increases due to inclusion of irrelevant road surface areas causing erroneous recognition
Solution Approach 1:
The patent applies local quality by creating a search area with non-uniform distribution of attention. Instead of treating all road surface areas equally, the system concentrates the search focus on specific regions determined by traffic light positions, giving higher priority to areas where stop lines are actually located while excluding irrelevant regions from detailed analysis
3Measurement precision
If traffic light detection is used to adjust the search area, then the measurement precision of stop line detection is improved, but the device complexity increases due to multiple detection and coordination units
Solution Approach 1:
The patent applies universality by designing the traffic light detection unit to serve multiple purposes. The same detection unit not only identifies traffic lights for signal recognition but also provides positional information for defining the stop line search area. This multi-functionality reduces the need for separate dedicated components while improving stop line detection accuracy through coordinated use of detection results
Data Source
AI summary
The stop line searching device includes: an image acquisition unit that acquires an image obtained by capturing an image of a front side of the own vehicle; a traffic light detection unit that detects a traffic light installed at an intersection in front of the own vehicle based on the image; and a setting unit that sets a stop line searching area for searching for a stop line related to the intersection, based on a detection result indicating whether or not a front side traffic light on the front side of the intersection as viewed from the own vehicle is detected by the traffic light detection unit, when the rear side traffic light on the rear side of the intersection as viewed from the own vehicle is detected by the traffic light detection unit.