Image processing apparatus which performs density control for each of plural colors of recording material
US6055011A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1996 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Dec 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
When tone correction is performed by forming a tone patch and measuring density thereof, a contrast processing method used for Bk toner is applied to color toner patches (Y, M and C) to obtain relative density free from any influence of a background. More specifically, density of a predetermined standard gray chart is first measured by a density sensor, the measured value of the gray chart is then substituted into an equation expressing Bk toner density, and a constant of the density sensor is obtained by the least square method. By applying the obtained constant of the density sensor to an equation expressing color toner density, relative density of color toners to background density is obtained in a manner similar to that for the Bk toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.