Image data compressing method and apparatus which compress image data separately by modifying color
US6836564B2 · kind B2 · utility
9Cited by
20References
76Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2001 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Feb 14, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image data compressing apparatus comprises a color selecting unit, a data separating unit and a data compressing unit. The selecting unit selects an arbitrary color contained in an original map image. The separating unit separates the original image data into a modified color data and a selected position data. The compressing unit compresses these data separately from each other to improve data compression efficiency. The modified color data may be data in which a color of a background portion is made equal to a color of a road, and the background color may be a color which is most popularly used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.