Driving equipment for multi-gradation level reproduction
US4368491A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1981 |
| Grant date | Jan 11, 1983 |
| Priority date | — |
| Expiry date | Feb 2, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40031
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An input picture signal is converted, for each picture element, into a K-bit, first time-serial signal having "ls" corresponding in number to the gradation level of the picture element, and the first time-serial signal are written in a random access memory, sequentially updating its column addresses upon every writing of K bits in its column direction. The random access memory is read out, updating its row addresses upon every reading out of M bits in the row direction. A second time-serial signal thus read out from the random access memory is subjected to a serial-parallel conversion by steps of M bits and parallel outputs of the M bits are supplied to recording elements respectively corresponding thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.