Navigation Device Junction Graphics Composition
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Solution Overview
Problem
Current navigation devices face memory constraints, limiting their ability to display enhanced manoeuvre graphics for all types of road junctions, such as roundabouts, due to high memory requirements for pre-rendered images.
Innovation Solution
A method for generating navigation manoeuvre graphics on a navigation device by composing and rendering junction graphics data at runtime using pre-defined graphical elements, reducing memory requirements by reusing these elements for different junctions, and incorporating lane information to adapt the graphics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-rendered images of actual junction geometry are stored for all junction types, then the navigability and manoeuvre guidance quality are improved, but the memory requirements increase significantly
Solution Approach 1:
The junction graphics are segmented into multiple reusable components including road segments, lane markings, arrows, and geometric shapes. Each component is stored separately and can be combined through composition to create different junction visualizations, reducing the need to store complete pre-rendered images for every junction type.
Solution Approach 2:
A universal set of graphical elements and composition rules is created that can be applied to generate visualizations for any junction type. The same basic elements (roads, lanes, arrows) are reused across different junction configurations through parametric composition rather than storing separate images for each junction type.
2Quantity of substance
If direct visual rendering of map data is displayed, then the memory requirements are reduced, but the manoeuvre guidance effectiveness decreases
Solution Approach 1:
The system performs preliminary composition of junction graphics using standardized elements and composition rules, creating a structured representation that can be quickly rendered when needed. This pre-established framework allows for efficient runtime generation of high-quality visualizations without requiring extensive pre-rendered image storage.
Solution Approach 2:
The composition system uses parametric control to adjust junction graphics based on specific junction characteristics, lane configurations, and navigation context. By changing parameters of the compositional elements rather than storing multiple fixed images, the system achieves high guidance effectiveness with minimal memory usage.
3Quantity of substance
If pre-defined graphical elements are composed at runtime, then the memory requirements are reduced, but the processing time increases
Solution Approach 1:
The graphical elements, composition rules, and rendering templates are prepared in advance and stored in a compact format. This preliminary setup enables rapid runtime composition by simply assembling pre-validated components rather than creating graphics from scratch during navigation.
Solution Approach 2:
The composition system is designed to be dynamically adaptive, selecting and assembling only the necessary graphical elements based on the current junction type and navigation context. This dynamic approach avoids processing unnecessary elements and optimizes runtime performance while maintaining memory efficiency.
Data Source
AI summary
A technique for controlling a navigation device to generate a navigation maneuver graphics for a road junction maneuver is proposed. A device embodiment of this technique comprises a routing module adapted to provide routing information pertaining to a scheduled route, with the scheduled route comprising the road junction. Furthermore, an interface to a map database is provided, with the map database containing road data pertaining to the upcoming road junction. A processor of the navigation device analyzes the road data to determine one or more junction geometry parameters of the road junction and to compose, based on the junction geometry parameters and from a plurality of pre-defined graphical junction elements, junction graphics data representative of the road junction. The processor is further adapted to generate, from the routing information and the junction geometry parameters, maneuver indication graphics data representative of the junction maneuver. A display module may then render navigation maneuver graphics based on the junction graphics data and the maneuver indication graphics data.