AR Route Display System for Linear Section Determination
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Solution Overview
Problem
In-vehicle Augmented Reality (AR) route displays appear unnatural due to the use of discontinuous coordinates, causing a feeling of strangeness for drivers as they do not accurately match the shape of the actual route, leading to bent or broken line representations of linear and curved roads.
Innovation Solution
A display system that determines whether a route section is linear and forms a connecting line between start and terminal nodes, and for non-linear sections, performs curve interpolation using nodes as control points to create a smooth AR route, while shifting node coordinates to align with the vehicle's travel lane to prevent unnatural appearances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discontinuous coordinates (nodes, links) are used to form the AR route, then the route can be displayed using standard map information, but the route appears bent or broken instead of matching the actual linear or curved road shape
Solution Approach 1:
The patent applies curvature by performing curve interpolation for non-linear route sections. Instead of connecting nodes with straight lines, the system generates smooth curved lines that pass through or near the control nodes, accurately representing the actual curved road geometry. This resolves the contradiction by maintaining ease of formation using standard nodes while achieving high shape accuracy through mathematical curve generation.
Solution Approach 2:
The patent changes the parameter representation from simple straight-line connections to parametric curves (such as B-splines or Bezier curves). By transforming the route representation method while keeping the same node-based input data, the system maintains ease of formation with existing map information while achieving accurate curved road shapes through parametric mathematical models.
2Manufacturing precision
If nodes are shifted to align with the vehicle's travel lane, then the AR route appears more natural and accurate, but the coordinate processing becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between standard map coordinates and travel lane coordinates. The node shifting operation is performed in advance during route formation, and the shifted coordinates are used directly for display. This resolves the contradiction by achieving high position accuracy while minimizing processing complexity during actual navigation through pre-computed coordinate transformations.
3Productivity
If a simple straight line connects start and terminal nodes, then the route formation is simple and fast, but the route does not match the actual curved road shape
Solution Approach 1:
The patent applies segmentation by dividing the route into linear sections and non-linear sections. For linear sections, simple straight-line connections are used to maintain high formation speed. For non-linear sections, curve interpolation is applied to achieve accurate curved road shapes. This segmented approach resolves the contradiction by optimizing for speed where possible and accuracy where necessary.
Solution Approach 2:
The patent applies partial action by performing curve interpolation only for non-linear route sections rather than all sections. Linear sections use simple straight-line connections, while only curved sections receive the computationally intensive curve interpolation treatment. This selective application maintains high overall formation speed while achieving accurate curved road representation where needed.
Data Source
AI summary
A display apparatus of the present disclosure determines whether or not a route section is a linear section on the basis of positional relationship among nodes within the route section including three or more nodes, and, for a route section which is determined to be a linear section, forms and displays a line connecting a start node with a terminal node of the route section as an AR route.