Image processing device
US6122406A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Mar 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30176
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image processing device of the present invention includes a photoelectric transducing section for transforming input image information to an electric signal. An analog-to-digital converter converts the electric signal to a digital signal. An image processing section for processing the digital signal has a shading correcting section, a filtering section, a magnification changing section, a gamma correcting section, and a tonality processing section. The filtering section is capable of selecting a particular filter intensity for each of two perpendicular directions in accordance with a desired magnification change ratio. The device is capable of varying an MTF (Modulation Transfer Function) characteristic in the subscanning direction in accordance with a magnification change ratio with simple hardware.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.