Hardware implementation of 4-pixel code encoder
US4327379A · kind A · utility
17Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1980 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Apr 11, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/415
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit to encode image data. The circuit receives image data in four bit nibbles which are either all-zero nibbles or terminating nibbles containing at least one non-zero bit. The circuit output is a series of code words, each a multiple of four bits and up to twenty-four bits long, packed into eight bit output words. Each code word contains a first part containing a run length specifying the number of received all-zero nibbles and a second part specifying the bit pattern of the terminating nibble. The circuit uses PROMs for the look-up and control elements and a pipeline of registers to allow high speed operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.