Image processing method and apparatus having high tone quality
US5379126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Jul 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multivalued input recording signal is to pulse-width modulation at a time unit shorter the period of a clock signal within the period of the recording signal. Alternatively, the multivalued input recording signal is converted into a plurality of different signals each of whose length of time is shorter than a clock signal within the period of the recording signal, thereby performing pulse-width modulation in accordance with a predetermined weighting. This makes it possible to obtain a highly toned recording signal without raising the frequency of the clock signal. Further, density tone data is generated in dependence upon inputted multivalued pixel data, control is performed using both the irradiation time and emission intensity of a light beam based on the generated density tone data. An image is formed by irradiating a photosensitive body with the controlled light beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.