Image processing method and apparatus with gamma-correction control
US5258783A · kind A · utility
27Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1992 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Feb 21, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S347/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus, which improves the image quality in gradation control, measures the density of a specified gradation pattern formed on a photosensitive drum with a photosensor and prepares a look-up table for gamma correction, based on thus measured density. Formation of a pseudo-contour is prevented by control of the inclination of the gamma correction curve represented by the data of the look-up table.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.