Stop Line Detection Using Crosswalk-Bounded Search Depth
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Solution Overview
Problem
Conventional stop line detection systems often erroneously detect lines other than the actual stop line, such as bus stop area division lines, due to their proximity and similarity in appearance, leading to inaccurate stop line identification.
Innovation Solution
A stop line detection apparatus that uses a front camera to recognize road and lane boundaries, sets a stop line search area with a depth smaller than twice the depth of a crosswalk, and includes units for detecting nearby traffic signals, crosswalks, and road markings to accurately define the search area and avoid erroneous detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the stop line detection area is set to include a wider range to capture potential stop lines, then the detection coverage is improved, but the erroneous detection of non-stop line markings increases
Solution Approach 1:
The detection area is segmented into multiple zones: crosswalk area, stop line search area (extending less than twice the crosswalk depth toward the vehicle), and excluded areas. This segmentation allows the system to focus computational resources on likely stop line locations while excluding regions where false detections are common, thereby maintaining detection coverage without increasing erroneous detections
Solution Approach 2:
Different detection strategies are applied to different spatial zones. The crosswalk area uses crosswalk detection algorithms, the stop line search area uses stop line detection with depth constraints, and areas beyond the search area are excluded from stop line detection. This local differentiation improves overall detection accuracy by applying appropriate detection methods to appropriate regions
2Length of stationary object
If the depth of the stop line search area is increased to detect stop lines farther from the crosswalk, then the detection range is improved, but the erroneous detection of distant lines as stop lines increases
Solution Approach 1:
The system changes the depth parameter of the stop line search area dynamically based on crosswalk characteristics. Specifically, the search area extends less than twice the depth of the detected crosswalk toward the vehicle, creating an adaptive search depth that adjusts to actual road conditions rather than using a fixed depth value
3Quantity of substance
If the stop line detection includes all lines on the road, then the detection completeness is improved, but the ability to distinguish actual stop lines from other markings decreases
Solution Approach 1:
The system extracts and processes only those lines that fall within the defined stop line search area, excluding all other road markings. By taking out the relevant portion (lines within the constrained search area) and processing them separately with stop line detection algorithms, the system maintains detection completeness for actual stop lines while filtering out irrelevant markings that would cause false positives
Data Source
AI summary
A stop line detection apparatus recognizes a boundary line of a lane on which the host vehicle travels, and detect a stop line at an intersection in front of the host vehicle. The apparatus sets an intersection area corresponding to the intersection in the road on which the host vehicle travels on the basis of a captured image by a front camera of the host vehicle, detects a crosswalk in the intersection area, a stop line search area setting unit configured to set a stop line search area extending from the crosswalk toward a front side in the lane on which the host vehicle travels, and performs stop line detection in the stop line search area. A depth of the stop line search area in an extending direction of a traveling lane is smaller than twice a depth of the crosswalk.