Navigation system, method for stereoscopically displaying topographic map for the navigation system, and recording medium recording the method
US6121972A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Aug 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3635
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for stereoscopically displaying the topographic map, a navigation system, and the recording medium recording the method, a multiple number of quadrilaterals with mutually adjoining four points of terrain locations as four vertices of each quadrilateral from the three-dimensional road map information are generated, each quadrilateral is divided into four triangles with one or two diagonal lines of each quadrilateral, a perspective projection transformation of three vertices of each triangle is performed onto a predetermined perspectively projected plane, a display color is allocated to each of the perspectively projected triangles, and the allocated display color is displayed on an image screen of a display device together with each of the perspectively projected triangles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.