Encoder and decoder for bandwidth compression
US4071855A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1976 |
| Grant date | Jan 31, 1978 |
| Priority date | — |
| Expiry date | Mar 3, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/415
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for segmenting a buffer memory into two-dimensional sectors such buffer memory having stored herein, in scan-by-scan format, bits representing the image of a document. The sectors comprise sections of adjacent scan lines arranged in a two dimensional array. Included in the apparatus is an address generating means which provides the address arrays for such sectors during the segmenting sequence and an encoding means which inspects the data in each segment. In the instances where all of the data in one sector represents background image a single bit code is transmitted. In all other instances the sector data is transmitted in its entirety. The same address generating and encoding means can be utilized in the receiving mode to reconstruct the code into corresponding data arrays to thus provide an image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.