Color image processing apparatus and color printer system
US7679781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2006 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Jan 16, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image processing apparatus includes: a minimum value selection unit that selects a minimum value of an input gray level values; a first calculation unit that calculates a generation amount of black; a second calculation unit that calculates an UCR amount which is a value relevant to the minimum value; a third calculation unit that outputs a correction coefficient value which is a value relevant to the minimum value; a subtraction unit that subtracts the UCR amount from each of the input gray level values to generate output; a multiplication unit that multiply the output of the subtraction unit by the correction coefficient value; a significant bit selection unit that selects a significant bit of a multiplication result; and a gray level correction unit that makes a gray level correction to the generation amount of black and the output of the multiplication unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.