Three-dimensional map display system
US9965894B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2015 |
| Grant date | May 8, 2018 |
| Priority date | — |
| Expiry date | Nov 12, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2210/62
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A map database stores map data in multiple levels having different levels of details. In displaying a three-dimensional map, the map data having a higher level of details is used for a close view area near the viewpoint to a predetermined distance, and the map data having a lower level of details is used for a distant view area farther from the predetermined distance. The distant view area is first drawn by a perspective projection, and then, after clearing a depth buffer that stores depth information, the close view area is drawn, such that an undesirable hidden line removal process based on the depth information is not performed between the projected image in the distant view area and that in the close view area, thereby avoiding an unnatural phenomenon in which part of the close view image is hidden by the distant view image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.