Image processing apparatus
US4864419A · kind A · utility
34Cited by
6References
39Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1987 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Aug 4, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an apparatus for obtaining image signal by tonal processing of an input signal. Pulse-width modulation of the input signal is achieved thorugh comparison with a second signal of a predetermined shaped, for example a triangular signal. In order to avoid the influence of fluctuating factors in pulse-width modulation, the apparatus also has a third signal generator, and the pulse-width modulated signal or a pattern signal generated by the third signal generator is selectively used for image formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.