Image reading apparatus, image reading method, and storage medium
US6657748B1 · kind B1 · utility
12Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1999 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | May 25, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image reading apparatus, required capacity of a memory for storing shading correction data is reduced, as well as the width of a standard white board for generating the shading correction data is shortened. These are achieved by sequentially generating the shading correction data corresponding to respective R, G and B components, independently, to share a data storage area necessary for generating shading correction data, further, by reversing a scanning direction when scanning a standard white board while illuminating it with light of the respective color components on generating the shading correction data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.