Iterative smoothing technique for pre-processing mixed raster content planes to improve the quality of a decompressed image and increase document compression ratios
US6334001A · kind A · utility
29Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2000 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Dec 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for compressing a mixed raster content image that represents a color or gray scale a document is disclosed. The pixel map is decomposed into a three-plane representation--a reduced-resolution "upper" plane, a reduced-resolution "lower" plane, and a high-resolution binary selector plane. An iterative smoothing technique is then used to pre-process the upper and lower planes using the information contained in the selector plane, thereby reducing the amount of data that will be subjected to further processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.