Lane Center Line Continuity for Changing Lane Counts
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Solution Overview
Problem
Existing methods for determining lane center lines in intelligent transportation systems are inaccurate for road segments with changed lane numbers, leading to discontinuous lane center lines that cannot be used as guiding paths for unmanned driving vehicles, and require manual editing, which is time-consuming and inefficient.
Innovation Solution
A method and apparatus that use a server to automatically determine lane center lines by obtaining related information from a database, calculating midpoint endpoints, and constructing Bezier curves to ensure continuous lane center lines, even in road segments with added or subtracted lanes, thereby improving accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to determine lane center lines in road segments with changed lane numbers, then the determination process is simple, but the accuracy deteriorates resulting in discontinuous lane center lines
Solution Approach 1:
The determination process is divided into distinct segments: identifying the target lane in the first road segment, finding the corresponding lane in the second road segment, calculating the intersection point of side lane lines, and constructing the lane center line through these points. This segmentation allows each step to be handled systematically, ensuring continuity even when lane numbers change.
Solution Approach 2:
The method transitions from two-dimensional lane line representations to three-dimensional spatial reasoning by calculating intersection points in space and using these points to construct continuous lane center lines across road segments with different lane configurations, effectively adding a dimensional perspective to solve the continuity problem.
2Measurement precision
If manual editing is used to correct discontinuous lane center lines, then accuracy can be improved, but time consumption increases significantly
Solution Approach 1:
The system performs self-correction by automatically identifying target lanes, calculating intersection points of side lane lines, and constructing continuous lane center lines through algorithmic processing. This self-service mechanism eliminates the need for manual editing while maintaining high accuracy in determining lane center lines across road segments with changed lane numbers.
Solution Approach 2:
The method changes the approach from direct lane center line extraction to using side lane line intersection points as intermediate parameters. By calculating where side lane lines intersect and using these intersection points to define the lane center line, the system achieves continuous and accurate lane center line determination without manual intervention.
3Reliability
If lane center lines are determined for road segments with changed lane numbers, then completeness of lane information is improved, but the complexity of handling added or subtracted lanes increases
Solution Approach 1:
The method provides a universal solution that handles multiple scenarios (added lanes, subtracted lanes, lane merges, lane splits) through a single unified approach. By identifying target lanes based on connectivity relationships and using side lane line intersection points, the system can determine lane center lines for any lane configuration change without requiring separate processing logic for each case.
Solution Approach 2:
The system performs preliminary identification of the target lane and its corresponding lane in the adjacent road segment before constructing the lane center line. By pre-establishing the relationship between lanes across the boundary and calculating intersection points in advance, the method simplifies the overall process of handling lane number changes and ensures complete lane information.
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
A method and a device for determining a lane center line. The method comprises: acquiring a target lane in a road segment in which the number of lanes change, the target lane referring to a lane to be added or reduced; with regard to the first end of the target lane, determining the middle point of the two endpoints of the lane lines at both sides of the target lane at the first end as the center endpoint of the first end; with regard to the second end of the target lane, determining the lane center point of an adjacent lane of the target lane as the center endpoint of the second end; and determining the lane center line of the target lane on the basis of the two center endpoints. With regard to a lane to be added or reduced in a road segment in which the number of lanes changes, the solution provided by the embodiments of the present application determines the lane center line of the lane, and can guarantee that the lane center line of the lane and the lane center line of a lane connected thereto are continuous, improving the accuracy of determining the lane center line. Furthermore, the solution provided by the embodiments of the present application completely uses automated calculation, without the need for manual intervention, improving the efficiency of determining a lane center line.