Method and apparatus for image coding
US6980693B2 · kind B2 · utility
3Cited by
11References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2002 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Dec 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image coding method that compresses an image read through an optical system. An image separation section carries out image area decisions in tile (macro block) units to separate the image into photographic image tiles and character image tiles. A layer separation section performs layer separation pixel by pixel to separate each pixel into pixels belonging to a background and pixels belonging to a foreground. Approximation processors alleviate an increase of entropy, due to layer separation through approximation processing, and carry out JPEG-like processing on photographic images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.