Method and apparatus for segmenting a composite image into mixed raster content planes
US6324305A · kind A · utility
68Cited by
9References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/41
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved technique for compressing a color or gray scale pixel map representing a document using an MRC format including a method of segmenting an original pixel map into two planes, and then compressing the data or each plane in an efficient manner. The image is segmented such that pixels that compress well under a lossy compression technique are placed on one plane and pixels that must be compressed losslessly are placed on another plane. Lossy compression is then applied to the lossy pixel plane while lossless compression is applied to the lossless pixel plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.