Clock control device used in image formation
US6493830B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1999 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Jun 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/71
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video data (default data in case of a black original) output from a CCD line sensor 405 upon reading an image while a light source is kept OFF corresponds to beat noise contained in video data obtained upon reading an image while the light source is ON. After the beat noise data is stored, the correction data stored in a correction data storage unit is subtracted from video data read by a normal technique while the light source is ON in a correction memory, thus executing correction for removing beat noise. After the beat noise is removed in this way, when an image is formed under the control of a printer control unit, an image free from any beat noise can be obtained as an output image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.