Video signal binary-coding apparatus and method
US4896365A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1988 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Nov 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A binary-coding which is effected converts a video signal into binary-coded outputs corresponding to white and black. More particularly, the binary-coding method and apparatus produces a black peak signal by following the black peak of a video signal, and makes a determination based on this black peak signal and video signal as to whether or not the video signal is rich in the black components so as to provide a binary slice select reference signal which takes the H level when the video signal is rich in the black components, holds the slice select reference signal for several scans in the vertical direction and for several bits in the horizontal direction, selects a binary-coded waveform obtained by slicing the video signal at a predetermined slice level when at least one among the slice select reference signals held is found at the level H indicating that the video signal is rich in black components, and outputs it as binary-coded output. Accordingly, a binary-coding method and apparatus is provided wherein when any hand-written or printed dark characters or the like are detected as a video signal and are binary-coded into white and black levels, the binary-coded output can be re…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.