Graded facsimile image signal coding system
US4652935A · kind A · utility
109Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1986 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Feb 25, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4172
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A graded facsimile image signal coding system is disclosed which is provided with means for distributing a multi-graded facsimile picture signal, represented by 2.sup.n gradation levels, into n bit planes corresponding to n digits; initial encoding means for detecting, from picture elements forming each bit plane, picture elements at intervals of .DELTA.X picture elements on every .DELTA.Y-th line and encoding the detected picture elements; and additional coding means for further coding each one of said encoded picture elements with reference to encoded four picture elements positioned around said one picture element to be coded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.