Information processing apparatus, printing apparatus, information processing method and printing method
US6390583B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information processing apparatus, a printing apparatus, an information processing method and a printing method can print high quality images without lowering throughput by correcting density variations to within a range where they can hardly be perceived by the human eye as stripes or unevenness. With this invention, a print head having a plurality of nozzles capable of ejecting ink is used to print a test pattern based on image data with a predetermined gradation level. Then, based on read data of the test pattern, a temporary correction value &agr;′[N] is calculated which will made the print density of rasters corresponding to each of the plurality of nozzles constant. The temporary correction value &agr;40 [N] is limited by the upper limit &agr;U and the lower limit &agr;L so that it is limited to within a range between &agr;U and &agr;L.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.