Image forming apparatus and image forming method
US7499660B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 2007 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | Oct 23, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/1633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image forming apparatus including (a) a γ conversion unit having a γ conversion table γαi of a first one Vcontα of a designation development contrast in a case that a development contrast correction amount ΔVcont1 is a first value, and a γ conversion table γβi, different from the γ conversion table γαi, of a second one Vcontβ, different from the first one Vcontα, of the designation development contrast in a case that the development contrast correction amount ΔVcont1 is a second value different from the first value, and (b) an arithmetic operation unit for calculating a γ conversion table γNowi of a third one VcontNow of the designation development contrast in a case that the development contrast correction amount ΔVcont1 is a third value, based on a formula: γNowi=γαi+(γβi−γαi)×(Vcontα−VcontNow/(Vcontα−Vcontβ), wherein the subscript i is a value of an output density signal in the γ conversion table. The γ conversion unit conducts the γ conversion of the third one VcontNow of the designation development contrast, based on the γ conversion table γNowI calculated by the arithmetic operation unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.