System and method for advanced 3D visualization for mobile navigation units
US6885939B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2002 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Dec 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2210/61
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system providing three-dimensional visual navigation for a mobile unit includes a location calculation unit for calculating an instantaneous position of the mobile unit, a viewpoint control unit for determining a viewing frustum from the instantaneous position, a scenegraph manager in communication with at least one geo-database to obtain geographic object data associated with the viewing frustum and generating a scenegraph organizing the geographic object data, and a scenegraph renderer which graphically renders the scenegraph in real time. To enhance depiction, a method for blending images of different resolutions in the scenegraph reduces abrupt changes as the mobile unit moves relative to the depicted geographic objects. Data structures for storage and run-time access of information regarding the geographic object data permit on-demand loading of the data based on the viewing frustum and allow the navigational system to dynamically load, on-demand, only those objects that are visible to the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.